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“Taking Quality To A New Level…Worldwide”


Tecvac, Inc. Concrete, Masonry & Stone Repair

800 847-9324

USA-Europe-Asia We’ve Been Around…


A Message From The President

Tecvac, Inc. Tecvac, Inc. is very proud of its long history of successful performance in solving concrete, masonry and stone problems around the world. Tecvac technicians have demonstrated time and time again that we can take quality to a new level...worldwide. My Grandfather's construction company was started in 1927 and Tecvac, Inc. is now the perpetuation of a third generation of proud constructors. While rooted in the proud efforts of the past, we have since gone on to set the pace for innovative repair methods that provide lasting value and permanence. We are recognized as a leader in developing new technology for repair and restoration. The National Capitol Chapter of the American Concrete Institute presented Tecvac with its first Award of Excellence for Concrete Repair in the new millennium. Our long time relations with engineers, consultant specialist and international construction firms has established a broad base of experts that enables us to draw upon specialized technical resources, both here and abroad. Tecvac has been called upon to consult with the Smithsonian Institute, General Services Administration, The National Park Service, Arlington Cemetery and with many others who have invaluable historic projects in the United States and around the world. In 1998, Tecvac engineers were invited by the European Society For Nuclear Research to participate with them in the development of their laser measuring device’s ability to mitigate nuclear vapor transmission. Closer to home, Tecvac’s second generation of vacuum repair processes have been selected by many as the one and only technology capable of fulfilling the objectives of their rehabilitation programs. However, what I am most proud of, is the organization's demonstrated tenacity and its ability to succeed where others have failed: the Veteran's Administration Headquarters Building leaked for forty years and yet technicians had it dry in eight days… a basement office in the Sackler Museum leaked for fifteen years, and technicians had it dry in three days…


we developed a color matching polymer-modified patch material for the Washington Metropolitan Area Transit Authority‌ we performed vacuum structural repairs to beams and columns without leaving a surface trace for Fairfax County Virginia‌ in the past seven years, five contractors could not stop the water intrusion from the ramp area into Washington Dc's Union Station; we take pride in the fact that Tecvac technicians stopped the leaks. As we now participate in university research, we remain dedicated to explore and develop new materials and methods of repair. Tecvac engineers are actively supporting and participating with the North Carolina State University in its efforts to establish a new standard related to infrastructure repair, monitoring and control. Our ever-expanding capabilities are far reaching and assure the permanent success of each project we undertake. Whether parking ramps or elevated mass transit platforms, railway bridges or airport runways; landmarks and grave stones, or other delicate treasures of the world, Tecvac continues to demonstrate its leading edge technical competency in the permanent repair of concrete, masonry and stone. Thanks to our extremely talented team of specialist technicians, I am confident that we will remain paramount in our ability to provide advanced repair services, offer world class consultations and research and, carry through with creative solutions for the most complicated problems. Because of our unique versatility, our proven experience, our superb management skills and a solid devotion to detail, you will enjoy peace of mind with Tecvac as your prime or subcontractor...you have my word on it.

Jeremy S. Boyd, President


FUN FACT: Otto von Guericke was born November 20, 1602 in Magdeburg, Germany and died May 11, 1686. A physicist, engineer and natural philosopher, von Guericke invented the first air pump and used it to study vacuums and the role of air in combustion and respiration. His first pumps were inverted fire engines that could evacuate larger volumes of air using static methods. His pumps were used to demonstrate the well-known Magdeburg experiment where two teams of horses, a total of sixteen, were unable to pull apart two evacuated brass hemispheres. His latter pump designs used lever pumping systems. In 1663, von Guericke also built the first machine to create an electric shock. While not quite as dramatic, his work was followed with the work of Christaan Huygens. Huygens view that a vacuum was devoid of physical properties is the foundation of all vacuum technology today. ##


TWO TEAMS OF EIGHT HORSES FAIL TO BREAK VACUUM SEAL Vacuum Phenomena Proved In 1600's To Be Stronger Than Sixteen Horses Magdeburg, Germany  A local Magdeburg man has demonstrated the power of a new phenomena called vacuum. Using a converted fire engine pump, Otto von Guericke pumped the air from two brass hemispheres that were fitted together and sealed. The contraption was then harnessed between two teams of eight horses on either side. When the animals were coaxed to move forward, the harnesses became quite taught. There was a bit of position shuffling as the struggle for dominance between the teams was established. Whipping of the animals was begun and the small crowd gave distance in anticipation of being struck by one of the brass segments upon separation. The full fury and force of hard pulling animals was then applied. The owner of the teams shouted for the riders to keep their heads down or risk being decapitated. The riders kicked and whipped the teams in a relentless effort to pull the hemispheres apart. But to no avail, the hemispheres did not part. As the animals were quieted, the vacuum secured hemisphere dropped to the ground undaunted by the event. Von Grericke smiled. The power of vacuum promises to enhance a number of unique and innovative engineering solutions, not the least of which being the repair of concrete, masonry and stone. Already, Madeburg city council members are considering von Guericke’s proposal to repair city hall. The hundred year old structure is suffering from alkali silica reaction and von Guericke’s vacuum process promises renewed hope of rescue. (satire)

For more information telephone toll free 800.847.9324.

TECVAC, INC. “Taking Quality To A New Level…Worldwide”

39482 Rickard Road Lovettsville, VA 20180 O -703.742.9186 F -703.742.9231 e-mail jeremy@tecvacinc.com


The power of vacuum has been proving itself for almost 40 years...Let Tecvac, Inc. demonstrate vacuum's superiority to conventional repair methods on your next restoration project. Call Tecvac, Inc. "Taking Quality To A New Level...Worldwide" 800 847-9324 email: jeremy@tecvacinc.com www.tecvacinc.net

Vacuum —a new accessry to repair Impregnation of cracks, porous concrete and mortar by resins is enhanced by applying a vacuum n-site repair of deteriorated concrete and stone and other masonry is being done by a new technique developed in Britain. The process uses vacuum to impregnate concrete or friable stone with silane formulations, thus consolidating and weatherproofing it. Defective areas of concrete pavements or structures can be filled and repaired with polymers by this method.

O

The process The work involves only a few steps. • The area or object is covered with polyethylene film. • Air is then extracted from the pores or cavities of the concrete or stone by vacuum pumps, creating a low pressure area. • A suitable impregnant is then introduced beneath the polyethylene cover. Normal atmospheric pressure causes the impregnant to penetrate the previously evacuated pores or cavities.

Impregnating a pier with resin while it is enclosed in polyethylene and subjected to vacuum. Although the pier shown is brick and mortar, the same procedure is used for concrete.

Until now, vacuum impregnation has been done only as a laboratory or factory operation. It is sometimes hazardous and always expensive to transport a statue or a part of a structure to and from a vacuum plant for repair. A spalling bridge or faulted pavement obviously cannot be transported under any conditions. This new process, howe ve r, takes the vacuum treatment to the jobsite. Of course, the process is not an answer for all civil engineering problems. It cannot be used where air leakage p re vents the development of a low pressure area within * Numbers in parentheses refer to metric equivalents listed with this article.


had not been successful. A test of the vacuum process was made on one aisle and the success of the test resulted in a contract to repair the other six. Work was scheduled so that only one aisle was out of commission at a time, and then only for short periods.

Cracked and spalling concrete Spalling concrete is an increasingly common prob-

PRESERVATION OF STONEWORK

Successfully repaired grout beneath rail in automated warehouse. Resin impregnation restored grout and maintained the required 0.04-inch(1) tolerance in the level of the top surface of the rail. a structure. Aside from this restriction, the process has been successful in a wide range of applications.

Repair of grout failures Two projects undertaken in Britain show how the process can be used for remedial work with failing grout. Rust stains on a post-tensioned concrete bridge indicated failure of grout in the tensioning ducts. Examination by local engineers confirmed this diagnosis. The failure of the initial grouting had allowed water to reach the steel tendons and cause them to rust. The duct was successfully impregnated with a resin formulation. A different problem was faced by a major British company when the grout beneath crane rails in their automated warehouse began to crumble. Less than 0.040inch( 1)* change in the level of the top surface of the rail would be enough to disrupt the computer- c o n t ro l l e d gathering of goods from the warehouse racks. Grout was failing under rails in all seven of the 390-foot-long(2) aisles of the warehouse, and conventional patching repairs

An intriguing application of the vacuum process has been the preservation of stone structures and statues that are deteriorating because of weathering or air pollution. For over 30 years, a marble statue in a Scottish border town had been on view only from mid-May till mid-September. The other 8 months of the year it had been heavily covered, to protect it from bad freeze-thaw deterioration. The statue was treated with the vacuum process and is now on view the year round. In another part of the world, a conservation expert from London’s Victoria and Albert Museum has been using the process for the Venice-in-Peril organization. Works of art, damaged by air pollution, are being treated with silane monomer. This substance cannot be injected as deeply into the crumbling stone by any other method. One of the important features of resin injection under vacuum is the excellent bond achieved between resin and base material. The resin penetrates fine cracks in the base material and bonds itself to the crack faces; any dust particles present become absorbed as filler in the resin. This feature of the process was demonstrated in work undertaken to strengthen what may be the world’s oldest railway bridge. Causey Arch in northeast England was built around 1720 to carry a railway from coal mines to the River Tyne. Constant wetting and frost action had caused the stone forming the inner part of the single-span arch to delaminate and scale away. To preserve the bridge as a landmark, it was necessary to stop this delamination. After the vacuum process was chosen for use, suspect sections of stone were identified and treated by a complex sequence of drilling followed by a combination of vacuum and low-pressure injection. A water-tolerant resin had to be used to treat the stone, which initially contained a considerable volume of water though most of it was drawn off by the vacuum. Subsequent core sampling showed that the resin had penetrated deeply into the stone and formed a tenacious bond between the separating layers.


The heavily used A40 motorway in London being repaired on a January night. Polyethylene film has been laid and sealed, and operators are connecting the vacuum lines to evacuate and dry the concrete before applying the resin.

cracks in the concrete pavement. As water enters the voids and the pavement deflects under the weight of traffic, the resultant pumping action increases the extent of the void. Eventually the concrete cracks at the edge of the void because of lack of support, and the pavement collapses. This had happened on a heavily used highway in London, at a point where diversion of traffic for any length of time for repairs would have caused great inconvenience. The Department of Transport experimented with the vacuum process to fill the voids under the road surface. Repairs were successfully completed overnight. The road was closed for only seven hours—a time span that included before-and-after deflection measurements. Following this trial, the process has been used on other major London roads. Repair times have diminished significantly with experience, and costs are now estimated to be about half those for conventional repairs. As an added benefit, this process allows the road to be cleared for emergency use within half an hour.

Potential lem as steel-reinforced structures age. Moisture reaches the reinforcement through hairline cracks or through the concrete itself where concrete cover is insufficient. The steel rusts and expands, creating stresses within the concrete that lead, eventually, to cracking, spalling and further corrosion. Highway bridges deteriorating in this way have been treated with the vacuum process, to seal water out and prevent further corrosion and then to restore the spalled surface. Accidental damage as well as deterioration may create the need for repair. The vacuum process has been used to repair cracks in a dock side and nearby building after a ship collided with them, as well as to repair highway bridges hit by vehicles.

Road repairs Many roads built in Britain in the 1930’s are now causing problems because of voids formed under joints or

Polymer repairs of concrete or stone carried out under vacuum or low pressure are demonstrably better than similar repairs done at normal pressure, if only because the polymers adhere more closely to crack surfaces. This benefit, added to the possibility of doing vacuum repairs on site, seems to offer great potential for future use of the process in an even wider variety of situations.

Metric equivalents (1) 1-millimeter (2) 120-meter-long

PUBLICATION #C790315 Copyright Š 1979, The Aberdeen Group All rights reserved


An Array of Cost Effective Solutions

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Grouting, Waterproofing, Surface Restoration Fracture and Void Filling, Delamination Bonding Historic Renewal of Concrete, Masonry & Stone

An Array of Cost Effective Services

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Turn-Key Design Retrofit, Vacuum Technology Conventional Repairs, Field Inspection Surveys Non-Destructive Testing With Impact-Echo

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ReNew with Tecvac

Technology For The New Millennium

“Taking Quality To A

hs andLevel… the narrowest New Worldwide" widths

Second Generation Vacuum Technology Offers deepest level of fill to the finest width of cracks at competitive prices. DEEP Penetrations Core sample extracted from High Line Tower Foundation experiencing Alkali Aggregate Reaction. Completed using minor excavation, repair materials were evident at 50” in the horizontal crack.

TECVAC moves repair technology to a new level of depth and fineness When you or your client invests in a facility repair, or maintenance program, you no doubt endeavor to acquire the latest technology, the best performance and the highest quality available. Moreover, with the notoriety and possibility of failure from conventional repair methods, it makes sense to pursue a method that will provide the most value and the most permanent method of repair for cracks and delaminations. Introducing the Tecvac Processes The TECVAC processes are a new generation of vacuum repair and renewal methods for concrete, masonry and stone members. These unique processes utilize the forces of nature to enhance their ability to transport repair materials to a great depth and level of fill.

By applying negative forces to the disrepair or damaged area, a number of the inherent problems associated with conventional pressure repair methods are eliminated. For instance, dead-end fractures and pressure pockets are totally eliminated. No other method of repair can make this claim. While the member is placed under the powerful forces of negative vacuum pressures, bond inhibitors, such as moisture and other foreign elements are removed prior to the introduction of the suitable repair resins.

actually held together while repair materials are introduced. There is no chance of extending damage with any of the TECVAC negative pressure permeation processes and petrographic reports have evidenced repair resin in cracks measured in the microns. Tecvac Personnel Are Readily Available To Discuss Your Particular Needs

The Tecvac Processes Create Lasting Permanent Repairs Repairs made with the TECVAC Processes are very permanent. Stress concentrations at the ends of unfilled cracks usually cause considerable problems. The freeze/thaw of residual water and thermal expansion of arrested air will degrade the concrete, masonry or stone member in time. Because the TECVAC processes are able to fill extremely narrow cracks, and a myriad of interconnected micro cracks, these most common problems are totally eliminated. There is always a tendency to burst the damaged member with conventional liquid compression pressure methods, but Tecvac technology performs just the opposite. The damaged member is

When choosing the right repair or renewal method for your project, TECVAC will help you consider methods and materials that will give you the investment protection and longevity you require. Partnering with us, and our proprietary processes, will provide you with repair permanence suited to your intended applications. Telephone today for more information about Tecvac, Inc..

800 847-9324

Office 703 742-9186 Fax 703 742-923


12/10/2009

Vacuum vs. Pressure How Vacuum Out Performs Pressure Injection [Tecvac, Inc. 39482 Rickard Road Lovettsville, VA 20180 703 742-9186] Authored by: Jeremy S. & Joshua A. Boyd


Tecvac, Inc.

Vacuum vs. Pressure How Vacuum Out Performs Pressure Injection Jeremy S. & Joshua A. Boyd

Vacuum technology has been proving its merit in the repair of concrete, masonry and stone since the processes were patented the early 1970's. We at Tecvac, Inc. have been performing a variety of vacuum processes since 1991. Many years prior to our conversion to vacuum, I would guess that we pressure injected as much epoxy as any of the other injection contractors in the area. We know the difference vacuum makes in the permanence of repairs and there is no question about its unprecedented qualities, especially when coupled with the right repair resin. We have vacuum applied epoxies and urethanes, but when performing structural repairs, methyl methacrylate is our product of choice; and for good reasons. Oh, I don’t suppose I blame the pressure advocates, especially those pump manufacturer's who's lively hood could be jeopardized with any notion that vacuum could un-do the prevalence of conventional pressure injection superiority. Howbeit, it sort of reminds me of the buggy builder though, talking about Henry Ford. No doubt, the guy had been building buggy's for 100 years and knew a thing or two about buggy's‌but he knew little about automobiles or Ford Motor Company.

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Tecvac, Inc. Lets start with the basics and the propagation of vacuum's total superiority to conventional pressure injection. As you might know, everything is porous. A typical crack has fissures, voids and interconnecting cracks located in the side walls of the fracture. These fissures, voids and interconnecting cracks continue on a microscopic level. Imagine sealing and pressurizing one of these little voids with air…like a concrete balloon. Is it hard to see how air and/or moisture can be trapped in the tiny fissures of the matrix? Imagine filling the concrete balloon with a pressurized liquid. How full do you think you would get it? Yet, using only a modest 10in of vacuum would reduce the pressure inside the cavity by half. But, lets just say we can only lower the pressure in the fracture area to 14psi from 14.7psi…and apply Boyle's Law. One cubic inch, one cubic foot or 1 cubic meter of air will evacuate! But vacuum, stand alone or assisted, employs the application of the most basic physics law…You cant put two things in the same place at once. Despite assertions otherwise, this is a very important law to be mindful of when considering vacuum vs. pressure. With that said, it has long been touted within the realm of pressure injection, and continues to be touted with numerous methods and apparatus to accommodate the purpose, that low pressure is better than high pressure. Now, if vacuum will eliminate ALL pressure, how can it be said that vacuum cannot reasonably be considered useful? That vacuum will contribute little, or be rarely useful to the pressure injection processes? Doesn’t it make sense that this lower pressure zone, induced by vacuum, would be more receptive to resin installation? Try the Boyle's Law thing. The installation and penetration of the repair resin is hence, two different animals. While pressure injection continuously labors against atmospheric pressure, vacuum injection flows because of atmospheric pressure. Think about it…injecting at a very modest 25psi is only serving its purpose by overcoming 14.7psi atmospheric (1bar). Why would it take 100, 200 or 1000psi to move material in a fracture zone? Porosity? Fluid resistance? Why would a vacuum applied to the same set-up, the same fracture zone, pull the material right out of an open bucket?...well, it does. Vacuum injection is starkly adverse to pressure injection; the vacuum process actually de-pressurizes the repair resin and, naturally de-pressurizes the entire fracture zone. Yes, all concrete is porous. The example of splashing a cup of water on a wall is evidence of that fact. However, while this porosity is remarkably useful when installing lowviscosity repair resins, it is not very useful when attempting to pressurize an enclosed fracture and then expecting the porosity of the concrete to dissipate entrapped air. What is air entrained concrete? More to the point, its not that concrete is good or bad at trapping air, it will tenaciously resist air moving through it. Pick up a piece of the roughest open-surface concrete you can find, so thin its fragile to the touch, and try to blow air through it. How much pressure do you think it would take to force air through a piece of solid concrete? Our vacuum processes 3


Tecvac, Inc. can seal a piece of plastic to a concrete surface so tight it is impossible to remove with out destroying it. How do we do that if air is moving through the concrete? There is a profound difference in air and moisture vapor moving through a concrete matrix and the dissipation of pressurized air during an injection process. I would pose this question to a competent and conscientious pressure technician‌or pump manufacturer. Lets think about the little concrete balloon again; and lets say you have a respectable pressurized fill level of 85% at the point of refusal. Good luck trying to get that concrete balloon 85% full without some exhaust. Anyway, how would one propose to achieve 90% fill level? Stay on the crack longer? Lower the pressure? No! It would require you to jack up the pressure. Only makes sense doesn’t it? Is it so hard for the pressure tout's to understand that increasing the pressure could, and will with enough force applied, extend the crack? Why? Because the entrapped air, the unvented void, will pressurize and exceed the strength of the matrix. At what pressure the extension would transpire is directly related to the design strength and condition of the matrix. Apply 3000psi pressure to a crack in a 2500psi matrix and it will give. If the greatest advantage of high pressures is production, what is the greatest disadvantage? And why do pressure injection specifications restrict the amount of pressure that may be applied during the injection process? We have used vacuum injection on just about all configurations of concrete, masonry and stone. In addition to individual crack repairs, vacuum can repair spider cracking by the square foot instead of the conventional lineal foot basis. Our vacuum processes can have an entire area repaired and back in service before a pressure application could be set up; and at a fraction of the cost. Unlike pressure injection, vacuum injection can be safely used for the repair of an unrestrained element. Topping slabs, mosaic tiles, delaminations, etc., can actually be simultaneously held together using the same vacuum forces used to perform the repair. This notion that high pressure cannot "blow out" a crack is nonsense. It is generally believed that any pressure in excess of 40psi has the potential to further damage concrete. REMR Technical Note CS-MR-3.9 states, "The pressure used for injection must be carefully selected. Increased pressure often does little to accelerate the rate of injection. In fact, the use of excessive pressure can propagate the existing cracks, causing additional damage." And what of ACI 301-05? "‌pressure can propagate the existing cracks, causing additional damage." Despite hollow preaching claims otherwise, the perils are real and well accepted. The chance of further damage, propagation of the crack condition, is significantly greater by following conventional pressure injection methods. Moreover, the matrix contains, at minimum, very nearly the same amount of moisture as the relative humidity of the atmosphere. Oh I know about the water insensitive epoxies used for pressure injection. But, its back to that basic physics law when it comes to material penetrations, you cant put two things in the same place at once. If there is moisture in the pore structure, there is moisture in the pore structure. Nothing will get in unless the moisture is displaced. Pressure applied to the crack will not do it. The flow and roll of the repair resin along the interior walls of 4


Tecvac, Inc. the fracture may pull some of it out but what happens to the moisture? We have found that because a manufacturer says so, does not necessarily make it so. Water insensitive epoxies will not bond when mixed with water. The failure to bond issue that this causes has been explained by the pressure injection folks. It doesn’t need to bond its been said. They go on to explain the mere fact that the member has cracked indicates it has relieved the pressures exerted in the first place. So, all one needs to do is fill the dormant void. But what if the pressure is not relieved, and even if it is, what is the need to get the material so deep into the fracture? Is 90% fill better than 70%? Sure it is. Consider a crack only filled 80% full. At the leading edge of the repair resin is a weakness. Apply pressure and the crack will radiate from this line and form a new fracture. That is, if the fracture is totally bonded the entire 80%. Of course, if its not bonded, the fracture will just open up again when/if it comes out of compression. Many times my pressure injected crack looked fine, but six inches over, a new crack developed. Coring of the existing repaired crack could reveal the new crack emanates from, and because of, the partially filled fracture. The more complete the fill, the more permanent the repair. Tecvac, Inc. routinely fills cracks as narrow as .001". Moreover, there are petrographic reports from CTL Labs that indicate cracks as narrow as 5 microns wide being filled using vacuum technology. We sometimes use pressure assist, but our success is directly attributable to our combination of vacuum and ultra-low viscosity repair materials, not pressure. True, the technology and the repair resins are a bit more complicated, but its not brain surgery and, for the injection of typical in-depth cracks in concrete members, our prices are quite competitive. Our repair resin of choice is low molecular weight methylmethacrylate (MMA). This material shares all of the physical properties of epoxy, yet is just about as thin as water. It has the ability to migrate into places epoxies will never see. MMA has some drawbacks of course, but this material will outperform epoxy in every instance when it comes to injection. It smells nasty, tends to bubble when put under pressure and is not easily metered. So, there is obviously not a lot of enthusiasm from epoxy manufacturers or epoxy pump manufacturers. But lets take the splash of water example again; splash a cup of water on a concrete wall or sidewalk. See how the capillary action sucks the water deep into the matrix? Now splash a cup of honey right next to it. Very thin epoxies are claimed to be 40 centipoise, but most used for pressure injection approach 100 or better. MMA is 5-7 centipoise. See the difference? Imagine the same two materials trying to get into that .001" wide fracture. Pressure honey or vacuum water. Oh, you have a crack that is 6" wide? We can thicken MMA to paste, and apply it at 20 degrees below zero. We can drill into your pressure injected crack, where the material only penetrated 1"2", pull our MMA up against and bond to the shallow epoxy filler. We can remove our set up without grinding or marring the surface of the concrete. Vacuum injection benefits and superiority over pressure injection go on and on.

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Tecvac, Inc. Witnessing these benefits, its not hard to understand why we, those of us in the vacuum injection industry, marvel at the natural wonder and the overwhelming power of vacuum. We don’t expect pressure injection folks and those with beneficial interest in that part of the concrete repair industry to embrace or even understand this technology. However, we do understand pressure injection. Tecvac technicians have performed 100's of gallons of pressure injection and know what it has to offer. We are ready for any challenge and hopeful that the results would bring the pressure injection folks into the present. The days of wooden wheels and buggy whips are a thing of the past. But hey, if you think our "new fangled contraption" will get you killed, then ride on in your buggy‌yah, giddiup. ~

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Vacuum Repairs Move To Second Generation TECVAC, Inc. specializes in the analysis and repair of damaged and disrepaired concrete, masonry and stone. Washington, DC  A construction specialty repair company has developed an array of vacuum methods to meet the rising occurrences of failure in concrete, masonry and stone members. Tecvac, Inc. employs high-end technology in both the analysis and repair of fractures and other defects in a host of applications. Its flagship process, the PermaNewaltm Finer Width & Deeper Fill Permeation Impregnation Process, utilizes vacuum to renew large area defects. “This method of repair is proven superior to any other method of introducing repair materials into fractures, voids, and punky spots.” says President of TECVAC, Inc., Jeremy Boyd. Unlike conventional methods of pressure repair that forces the material along, the PermaNewaltm process sets up a negative pressure zone that persuades the material along naturally. “This method will set the performance standard for concrete repair.” Boyd goes on. “It is so completely filling and it works superbly in an array of associated applications.” Indeed, the proprietary process, originally developed in Europe in the early 70’s, has been used to restore everything from statues to bridge columns, warehouse floors and tile mosaics, marble facades and ancient stone relics. Research indicates its ability to repair and mitigate alkali silica reaction in concrete. TECVAC, Inc. employs an active R&D element that applies new technology to old problems. “Most of our processes were developed to address a specific problem encountered in the field.” says Boyd, “Research and Development is the mainstay of this organization. It moved us into a second generation of technology and it keeps us on the leading edge of the renewal business.” CO2 Blasting, Electro Osmotic Material Induction and Silica Sculptor Flour are currently in development. Tecvac’s Copenhagen affiliate is now preparing the final stages of testing a vacuum applied carbon fiber reinforced plastic in-situ support system for adding Results of CO2 Blasting strength and support to weakend members.


Boyd, who is Cornell trained in the use of the Impact-Echo method of nondestructive testing, intends to utilize Impact-Echo for analysis and quality control. “There are countless analytical applications for Impact-Echo, but I am ever impressed with its abilities that pertain to fracture analysis. It is the only un-intrusive method available to measure the depth and extent of cracks. In a before and after scenario, it will positively depict repair materials and the depth of fill.” Boyd was one of the first impromptu students of Claus Peterson, the owner of Germann Instruments and manufacturer/distributor of the DOCter, Impact Echo Testing Equipment. Impact-Echo Testing

In addition to utilizing conventional repair materials, such as epoxies and urethanes, TECVAC, Inc. will also employ some not so conventional materials such as methyl methacrylates, vinyl esters, silicates and micro fine cements in the performance of its repairs. “Each project is different and will require different applications of materials.” Boyd says. “When we repair leaking fractures, for instance, we would probably prefer to use an expanding vinyl ester as opposed to a urethane. Among other advantages, vinyl ester is much thinner and the low viscosity has proven to work well with our vacuum processes.” In keeping with its trend setting endeavors, Tecvac, Inc. is backing up its claims of superior quality with long term warranties; three years is standard with options available for extended periods of five, ten and fifteen years available. “Customers don’t want to complete the same repairs over and over. Our repairs are designed and installed to last.” Boyd goes on to state, “Tecvac can take the worry and responsibility for failed repairs away from the owner for ever. We stick to the one thing that gives us the edge; Proper Analysis Directs the Proper Repair. We at TECVAC have confidence in what we do and we just pass this on to our clients.” Tecvac’s rapid response team is capable of meeting stringent requirements with world class service. “Our technicians have responded to client needs around the world.” Tecvac technicians are vastly experienced and have responded to problems across the US, the Caribbean and China. ##

Tecvac, Inc. "Taking Quality To A New Level…Worldwide"

39482 Rickard Road Lovettsville, VA 20180 Office 703.742.9186 FAX 703.742.9231 email jeremy@tecvacinc.com


“Taking Quality To A New Level…Worldwide”

Product, Procedure and Information Resource Tecvac, Inc.'s professional staff combines the ingenuity, technology, and objectivity needed in support of your efforts to provide professional expertise to your clients. Large or small, few other firms can equal our depth and breadth of experience, particularly in the specialized repair of concrete, masonry and stone. We can furnish you with the tools, knowledge, and skills to respond confidently to the uncertainties of today's volatile and increasingly competitive market, regulatory environment, and strict operating conditions. We are a comprehensive resource: a spectrum of experts, services, skills, industry experience, and materials knowledge that can be focused on discrete repair projects and problems, broad investigative studies, or continuing as-needed services. Our exclusive, vacuum processes draw upon state-of-the-art, widely applied experience and field tested resources to provide you the most complete and permanent solution for structural repairs, concrete restoration, and an array of other problems associated with concrete, masonry and stone. We tailor our services to each client's special requirements and you can expect a close and attentive involvement. Most importantly, you can expect our seasoned experts will bring a store of pick and shovel savvy that makes the difference between a plausible theory and a workable, successfully implemented recommendation. We invite you to call in our professional team of experts to assist you in your next rehabilitation and restoration project. The essential knowledge we provide can assist you in determining the present stage and actual source of the problem or failure...this vital information will guide your recommendation to treat the cause…rather than the symptom.

ASSISTIVE SERVICES FROM TECVAC, INC. Condition Surveys Test Procedure Recommendation Core Extractions Coordinated Lab Testing Evaluation Reporting Repair Recommendations On-site Inspections

Impact-Echo Testing Pulse Induction Testing Damage Evaluation Construction Management Scheduling Cost Estimating Troubleshooting

Phone Today “Tecvac, Inc. will provide you with reliable information you can depend on for more permanent repairs of concrete, masonry and stone.”

800 847-9324 "Taking Quality To A New Level…Worldwide”


Turn-Key As your primary contractor, Tecvac, Inc. can provide all the necessary research, resources and a host of creative solutions. When you call upon Tecvac, Inc., you call upon a complete network of worldwide resources you can count on for performance and results. We can provide you with a level of service to meet your particular requirements. If you choose Tecvac to provide primary contractor services, we will take special care in diagnosing the specifics of your problems. Prior to any restoration or preservation work, an in-depth analytical study is performed. Specialists are called in to obtain a complete and thorough understanding of the structure and the problems. Then, a concept design is prepared for each of the identified deficiencies that will inform and provide a choice of options for remediation. Once the most suitable methods are selected, the renovation can be fast-tracked to completion. Thus, the specific requirements, repair methodologies and materials and the implementation of the envisioned repairs can be clearly defined…all from a coordinated team of engineering specialist, orchestrated from a single point of responsibility with an established and fixed budget.


Sole Source Tecvac, Inc. has consulted with hundreds of engineers on hundreds of projects. On many occasions, vacuum is the ONLY choice of repair methodology. Our vast expertise in the restoration of concrete, masonry and stone fabrics is known worldwide and relied upon to provide permanent solutions. U.S. General Services Administration "Contractor must patch and repair all cracks identified on the walk-thru. The repair process must be PermeJecttm Vacuum Permeation Injection Process." Washington Metropolitan Area Transit Authority "vacuum impregnation is the only proven method of concrete rehabilitation and is therefore essential to the Authority requirements." McMullan & Associates Engineers "Advantages of Option 3 include: Pressure pockets are eliminated in dead end cracks, the structure is not damaged due to the application of positive pressure, low viscosity materials may be used to more effectively seal cracks, and water is extracted from the crack prior to and during injection." Further, "We conclude that Option 3 is the only viable choice for a cost effective and successful infill of the existing South basement wall crack."


Satisfied Customers Tecvac, Inc. has compiled an impressive list of completed projects and satisfied customers. Here is what some have to say about the professionalism of our technicians and the quality of the repairs performed using the Tecvac Processes: Smithsonian Structural Beam Repairs with Cleansettm "Your technicians performed in a courteous and professional manner. The work was completed and we hardly knew they were there." - Derek Ross, Smithsonian Institute Parapet Wall Repairs to High Rise Building "Thank you for responding so quickly. The repairs look great and they made such a difference to the building." Bob Behm, 200 Glebe Road Partners Social Security Administration Headquarters "The report of finding is now prepared. Tecvac, Inc. was instrumental in the investigation's rapid turn-around. Thanks for the devoted attention." - Drew Hudel, McMullan & Associates, Inc. Herndon/Monroe Park'N Ride Parking Facility "My complements to Tecvac, Inc.. You performed each of the many tasks we assigned you with care and professionalism. It was a pleasure working with your firm." - Michael Saba, The Guardian Group, Inc.


Project Briefs Tecvac technicians have completed projects around the world...here are examples of a few: Project: IRS Headquarters Owner: Internal Revenue Service Engineer: McMullan & Associates Contact Person: Chuck Gavin Phone: (703) 556-0651 Contract Price: $ 342,413.00 Date Completed: December 1999 Job Description: Structural Safety Improvements Deteriorated concrete threatened collapse of courtyard sections onto mechanical equipment and occupied space below. Highly complicated project where two individual slabs to be removed were located in the middle of the delivery dock courtyard. This replacement area, located some thirty feet high, over an extremely congested mechanical equipment room, also accessed the parking garage used by senior level IRS personnel. The slabs removed also contained the only two drains used to remove rainwater from the open courtyard, which required special waterproofing measures. During repair operations, traffic into and out of the parking garage, loading dock deliveries and watertight conditions had to be maintained. Existing Conditions

Project: Herndon/Monroe Park'N Ride Parking Facility


Owner: Fairfax County Virginia Engineer: Delew Cather Contact Person: Depak Patel Phone: (703) 906-4130 Contract Price: $1,276,966.45 Date Completed: July 1999 Job Description: Various Repairs For Project Completion Structural crack repairs, polymer modified patching, welding repairs, expansion joint modification, elevation corrections, member support jacking, sealers and waterproofing. This four level pre-cast garage experienced many contract deficiencies and problems, not the least of which was a "no crack" clause in the contract. Cracks developed in the members soon after erection and the only method of repair acceptable by the County was the vacuum process CleanSettm, by Tecvac, Inc.. While on-site, Tecvac was also requested to perform patching with its exclusive PatchMatchtm process. Over 6,000 patches were installed. During the six month project, Tecvac installed bearing pads, corrected imbed deficiencies, jacked structural members, waterproofed, sealed and sandblasted various components. Tecvac was acknowledged as instrumental in the final completion of the project.


Project: Link Structure Ramp Repairs Job Description: Expansion joints replacements, concrete deck repair, vacuum injection, water leak investigation and remediation. Owner: Union Station Redevelopment Corp. Architect/Engineer: McKissack & McKissack Contact Person: David Ball Sr. Phone: (202) 906-4130 Contract Price: $1,109,119.00 Date Completed: November 1999 Project: Paver Tile and Granite Edge Repairs Job Description: Concrete spall repairs and vacuum impregnation. Owner: Washington Area Metro Transit Authority Engineer: Delew Cather Contact Person: Jan Zichha Phone: (301) 322-5233 Contract Price: $2,980,000.00 Date Completed: June 1992 Project: Miscellaneous Repairs and Graffiti Coating Job Description: Concrete spall repairs and vacuum impregnation of aerial structures. Owner: Virginia Department of Transportation Contractor: Driggs Corporation Contact Person: Rick Galliher Phone: (301) 440-1374 Contract Price: $43,877.00 Date Completed: August 1999


Representative History of Significant Renewal Projects Completed By Tecvac Technicians

Inspection Door Installation National Airport Aerial Structures Washington, DC Washington Metropolitan Area Transit Authority Structural Crack Repairs Wilson Bridge VA & MD Maryland Highway Department Historic Restoration and Repair Bridge 1A Wilmington, DE Delaware Department of Trans Structural Repairs and Renewal Chambers Works Water Treatment Facility Deepwater, NJ Dupont Chemicals Historic Wall Repairs Smithsonian Art Gardens Washington, DC Smithsonian Institute Leaking Wall Repairs African Arts Museum Washington, DC Smithsonian Institute Leaking Wall Repairs Department of Commerce Building Washington, DC Department of Commerce Post Tension & Structural Repairs Union Station Link Structure Washington, DC Union Station Redevelopment Corp

Garage Repairs and Completion Fairfax County Park'N Ride Herndon, VA Fairfax County Government Expansion Joint Repairs Union Station Washington, DC Union Station Redevelopment Corp Granite Edge, Parapet and Structural Repairs Naylor Road Branch Line Station Washington, DC Washington Area Metro Transit Authority Balcony Repairs and Loading Dock Ft. McNair Washington, DC US Army Post Tension & Structural Repairs Cameron Run Bridges (3) Alexandria, VA Washington Metropolitan Area Transit Authority Paver Tile & Granite Edge Repairs Elevated Platform Stations (4) Maryland and Washington, DC Washington Metropolitan Area Transit Authority Swimming Pool Leak Repairs & Non-Destructive Testing Glassboro State College Glassboro, NJ Glassboro State College


Structural Repairs Office Building Arlington, VA 200 Glebe Road Partners

Non-Destructive Testing Survey Hirshhorn Museum Building Washington, DC Smithsonian Institute

Warehouse Composite Floor Renewal & Non-Destructive Testing Sunnyside Industrial Park Laurel, MD Security Capitol Industrial Trust

Structural Integrity Renewal Elevated Deck Crab Tree Valley Mall Raleigh, NC CVM Associates

Parking Garage Deck Renewal Health & Human Services Building Washington, DC General Services Administration Non-Destructive Testing Survey Government Printing Office Equipment Floor Area Washington, DC US Government Printing Non-Destructive Testing Survey Aerial Structures (5) Atlanta, GA Metropolitan Atlanta Rapid Transit Authority Non-Destructive Testing Survey Roof Top Structure Washington, DC US General Services Administration Parking Deck Traffic Coating Union Station Link Structure Washington, DC Union Station Redevelopment Corp. Non-Destructive Testing Survey Pentagon Washington, DC US Corps of Engineers

Post Tensioning and Repairs SE/SW Freeway Bridge Washington, DC DC Department of Public Works Leaking Basement Repairs Building 510 Naval Surface Warfare Systems White Oak, MD US Navy Structural Column Repairs National Navy Medical Center Bethesda, MD US Navy Clairifier Leak Repairs Corbolis Water Treatment Facility Fairfax, VA Fairfax County Water Authority Structural Repairs Student Activities Auditorium College Park, MD University of Maryland Structural Rehabilitation and Renewal Water Treatment Plant Fredericksburg Water Treatment Facility Fredericksburg, VA Department of Public Works


Structural Beam Repairs Forestall Building Washington, DC US General Services Administration Planter Waterproofing and Deck Repairs Harry Diamond Laboratories Prince Georges, MD US Army Concrete Repairs and Coal Chute Renewal Central Heating Plant Quantico, VA US Marine Corps Plaza Repairs and Beam Repairs Building 10A Washington, DC US General Services Administration Component Deficiencies Walter Reed Army Medical Center Washington, DC US Army Drainage Repairs and Wells Ft. Belvoir Ft. Belvoir, VA US Army Non-Destructive Testing Survey Taiwan Rapid Trans Sys Mucha Line Taipei, Taiwan ROC Chinese Institute of Civil and Hydraulic Engineering Structural Restoration of Beams Erh Jen River Bridge Kaehsiung, Taiwan ROC Ministry of Transportation

Structural Restoration of Beams National Taiwan Ocean University Kelung, Taiwan ROC Ministry of Education Non-Destructive Testing Survey Pentagon Washington, DC US Corps of Engineers Structural Repairs Student Activities Auditorium College Park, MD University of Maryland Leak Repairs Union Station Washington, DC Union Station Redevelopment Corp Deck Crack Repairs Trans Freeway Bridge Taipei, Taiwan ROC Ministry of Transportation Emergency Structural Repairs United States Federal Building St. Croix, USVI General Services Administration Wall Leak Repairs Sakler Museum of Art Washington, DC Smithsonian Institute Structural Repairs and Renewal Piers and Platforms Various Stations (5) Baltimore, MD Maryland Mass Transit Authority Leaking Floor Fractures Ronald Reagan National Airport Washington, DC Metropolitan Airport Authority


Safety Structural Repairs Internal Revenue Service Hdqtrs Washington, DC Pepco Services, Inc./IRS

Cooling Tower Testing Support Department of Labor Bldg. Washington, DC General Services Administration

Branch Avenue Structural Repairs Washington Metropolitan Transit Authority Platform Washington, DC Lane Construction Company

Transformer Support Bases America Online Building (AOL) Manassas, VA Holder Construction

Non-Destructive Testing Impact Echo/PT Survey Link Ramp Structure Washington, DC Union Station Redevelopment Corp Emergency Retainer Rail Grouting Wilson Bridge VA & MD Maryland Highway Department Leak Repairs Metro Traction Power Substation Alexandria, VA Washington Metro Area Transit Authority Various Improvements Landmark Shopping Center Parking Garage Arlington, VA Foulger Pratt Construction Office Improvements & Upgrades Parking Level Security Office Washington, DC Amtrak Police PT Cable Pachometer Survey Link Ram Structure Washington, DC Paragon Engineering, Inc.

Anti-Graffiti Coating Virginia DOT Flyover Herndon, VA Driggs Construction Co. Aesthetic Improvements Naylor Road Station WMATA Washington, DC Lane Construction Company Floor Delamination Retrofit Fairfax Adult Detention Facility Fairfax, VA Blake Construction Company Improvements & Upgrades Various Locations Metro Washington, DC Crown Oil Company Expansion Joint Installation South Park Office Complex Herndon, VA Clark Construction Company Structural Improvement Analysis Streetsboro Middle School Streetsboro, OH R.M. Ginsert & Associates Topping Slab Replacement Piscataway WWTP Washington Suburban Sanitation Authority


Tecvac, Inc.

tm

The TECVAC

The TECVACtm

Vacuum Processes

Vacuum Processes

•PermeJecttm Vacuum Permeation Injection Process

•TecSealtm Permeation Leak Repair Process

A method for filling singular and distinct cracks in a member or structure. This method has successfully pulled repair materials through and across 14’ thick concrete members.

A method for sealing singular and distinct leaking cracks in a member or structure. Stubborn leaks are no match for this negative force repair process.

•TecBondtm Interface Permeation Process

tm

•PermeNewal Permeation Impregnation Process A method for restoring the structural and surface integrity and repairing large areas of map cracking or porosity. Deep penetration can shut down ASR activity.

A method for re-establishing the composite bond of delaminated topping slabs. Removal and replacement is a thing of the past. Often performed with little or no disruptions to on-going operations.

•CleanSettm Permeation Injection Process

•TecJointtm Expansion Joint System **Just Added**

A method for filling singular and distinct cracks in a member or structure with particular emphasis on the ability of the process to be set up and removed with little to no marring or defacing of the repaired structure or member.

CrackMasktm Blends Cracks To Match the Color and Texture of Concrete, Masonry & Stone

A method and material to provide or repair expansion and/or traffic joints. This is a must system for heavy traveled joints. Long term warranty insures little to no maintenance. Phone Toll Free For More Information

1 800 847-9324 O- 703 742-9186 F- 703 742-9231


TECVAC, INC. 39482 Rickard Road Lovettsville, VA 20180 O -703.742.9186 F -703.742.9231 e-mail jeremy@tecvacinc.com

Contact: Jeremy S. Boyd TECVAC, Inc. 703.742.9186

Tecvac, Inc.'s PermeJecttm Vacuum Permeation Injection Process is Far Superior to Conventional Pressure Injection The power of vacuum is used to more permanently repair concrete, masonry and stone. For Immediate Release Wednesday, December 16, 2009 The PermeJecttm Vacuum Permeation Injection process: 

Has pulled repair resin 14’ depth of member construction joint

Removes trapped moisture

Routinely fills cracks .001in wide

Does not require post grinding of sealer so there is no surface marring

Cracks can be “masked” to blend into existing surface

No grinding or marring Irregular surfaces, such as fluting or intricate cornices

Cracks can be repaired to -20deg.F

Can be used to re-inject failed epoxy injection

Gets into the narrowest fissures and interconnecting cracks

Mitigates alkali silica reaction

For more information and to discuss your particular problem, contact Jeremy at 703.742.9186 or toll free at 800.847.9324. Ask for the full vacuum/pressure comparison report.


Tecvac, Inc. Presented With NCC/ACI's First Concrete Repair Award In The New Millennium

the

Tecvac, Inc. Receives Award of Excellence For Concrete Repair

facility and is credited with resolving a host of difficult repair tasks…with ecvac, Inc. is the recipient a host of multiform techniques. Not of the National Capitol the least of which was Tecvac's Chapter of The American ability to perform structural repairs Concrete Institute's Year without surface destruction or 2000 Award of Excellence in marring. Concrete Repair for work it Tecvac, Inc. is an performed at the Herndon /Monroe internationally recognized leader in Park'N Ride Garage Facility in innovative repair techniques for Fairfax, Virginia.. concrete, masonry and stone using Tecvac applied its exclusive vacuum technologies. Call today for vacuum processes throughout the more information. four level precast concrete Tecvac, Inc.

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Office 703 742-9186

886 Rhonda Place, SE Leesburg, VA 20175 FAX 703 742-9231 toll free 800 847-9324

www.tecvacinc.com


June 26, 2000 Tecvac, Inc. Jeremy Boyd 703 742-9186 - Office 703 742-9231 - Fax

Tecvac, Inc. Receives Award Of Excellence For Concrete Repair When Jeremy Boyd accepted the ACI Award of Excellence For Concrete Repair, he paid tribute to his Grandfather and his Father. While he and his brother had always worked with their Father during school breaks in the summer, he gave little thought to the proud heritage that made it possible. His Grandfather passed away when he was just a baby, but this award recognition put a new depth and meaning to all the old stories. In addition to walking ten miles to school, every day in the snow-uphill both ways, in 1927 his Grandfather mixed concrete by hand. Thirty years later he was placing thousands of cubic yards of concrete per day in the likes of the Grand Coolie, Flaming Gorge and Big Bend dams. His Father only walked uphill one way and set forms on the first high rise building constructed in Crystal City. He has since performed a host of repair projects around the world, including two rounds of repairs on Washington's notorious Wilson Bridge. Now, the twenty-seven year old President of Tecvac, Inc. is at the helm of tradition and is the recipient of The National Capitol Chapter Of The American Concrete Institute's Year 2000 Award of Excellence In Concrete Repair. Under Jeremy's leadership, the company developed an array of proprietary vacuum methods to meet the rising occurrences of failure in concrete, masonry and stone members. Their CleanSettm Process for unmarred structural repairs was selected by Fairfax County to be applied to its Herndon/Monroe Park'N Ride Garage located in Herndon Virginia. The process allowed cracks in columns, beams and other members within the public view to be structurally restored. Most importantly, the cracks were restored without leaving the tell-tail signs of the repairs on the member. "It was a delight to work with these guys." says Mike Saba of Guardian Group, the construction managers, "They performed every task with a demonstrated know-how and left little evidence they were there. Tecvac is highly recommended." Quietly operating from its basement headquarters in Sterling, Virginia, Tecvac employs 35 repair technicians who have performed work around the region and around the world. "Jeremy didn't want to build just another injection/patching concrete repair company." says bother and Vice President Joshua, "He wanted to build a company that would set the pace for quality repair technology in the new millennium". Indeed, he has. Tecvac, Inc. is a full service restoration company that employs high-end vacuum technology in both the analysis and repair of fractures and other defects in a host of applications. In addition to utilizing conventional repair materials, such as epoxies and polyurethanes, Tecvac also employs some not so conventional materials such as methyl methacrylates, vinyl esters, silicates and micro fine cements in the performance of its repairs.


Tecvac works with a legion of architects and engineers. It is currently offering owners a turn-key approach to restoration and repairs. This customized project design/retrofit delivery system provides the owner with an independent team of specialist. The team is capable of analyzing the problems- then designing and implementing the repairs. Never short on innovation, in some cases Tecvac can structure financing of the entire project. In keeping with its trend setting endeavors, Tecvac, Inc. backs up its exhibition of superior quality with long term warranties; three years is standard with options available for extended periods of five, ten and fifteen years available. “Customers don’t want to complete the same repairs over and over. Our repairs are designed and installed to last.” Jeremy goes on to state, “Tecvac can take the worry and responsibility for failed repairs away from the owner for ever. We stick to the one thing that gives us the edge; Proper Analysis Directs the Proper Repair. We have confidence in what we do and we just pass this confidence on to our clients.” The Herndon/Monroe Park'N Ride Garage marked the inauguration the Dulles Corridor Express Bus Service. The award winning 800 space garage repair project also recognized the innovation and quality work of a small specialist repair company. Tecvac is devoted to solving problems with concrete, masonry and stone by improving conventional methods and the development of new methods. Tecvac employs an active R&D element that applies new technology to old problems. “Most of our processes were developed to address a specific problem encountered in the field.” says Boyd, “Research and Development is the mainstay of this organization. It moved us into a second generation of technology and it keeps us on the leading edge of the renewal business.” CO2 Blasting, Electro Osmotic Material Induction and Silica Sculptor Flour are currently in development. Jeremy is Cornell trained in the use of the Impact-Echo method of non-destructive testing. The company uses Impact-Echo for condition surveys and, in some cases, for analysis and quality control. “There are countless analytical applications for ImpactEcho, but I am ever impressed with its abilities that pertain to fracture analysis. It is an explicit un-intrusive method to measure the depth and extent of cracks. Jeremy was one of the first impromptu students of Claus Peterson, the owner of Germann Instruments and manufacturer/distributor of the DOCter, Impact Echo Testing Equipment. A glance at Tecvac's past and current project list demonstrates its diversity. While it performs extensive repairs to the ramp at Washington's Union Station, it is also completing a two year restoration of a marble headstone from the first presidents ancestral grave yard. While repairing broken prestressed cables and replacing expansion joints technicians also repaired cracks in delicate Smithsonian concrete without leaving a trace. Recently completed projects include: taxiway repairs at Dulles International Airport; leak repairs at Reagan International; slab replacements at the IRS Headquarters Building; structural repairs to historic exposed aggregate for the Smithsonian Institute; and, closely matching patches for The Washington Metropolitan Area Transit Authority. "I never walked to school in the snow but, just few years ago my brother and I were on our hands and knees pumping cracks in a tunnel at Reagan. I can appreciate that my Grandfather's teachings have everything to do with our growth and receiving this award." says Jeremy, "My dad always said, giv'm on-time quality work with value, and the word will get around."


For the Second Year In A Row, Tecvac, Inc. Has Been Presented With the NCC/ACI's Award of Excellence For Concrete Repair

Tecvac, Inc. Receives Award of Excellence For Concrete Repair

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Using its proprietary TecSealtm Process of leak repair, technicians successfully mitigated a host of chronic leaks in the station. Technicians also performed structural repairs without surface destruction or marring of the historic members. Tecvac, Inc. is an internationally recognized leader in innovative repair techniques for concrete, masonry and stone using vacuum technologies. Call today for more information. Tecvac, Inc.

ecvac, Inc. is the proud recipient of the National Capitol Chapter of The American Concrete Institute's Year 2001 Award of Excellence in Concrete Repair for work it performed at the Historic Union Station in Washington, DC. For the second year in a row, Tecvac has been recognized by its peers for completing a difficult project using its exclusive vacuum processes.

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39482 Rickard Road Lovettsville, VA 20180 Office 703 742-9186

FAX 703 742-9231 toll free 800 847-9324

www.tecvacinc.net


Tecvac, Inc. Presents Paper On Vacuum Technology At 25 th Anniversary Conference

Tecvac, Inc. Attends 25th Anniversary of Our World In Concrete Structures In Singapore

experience a number of unique problems with concrete structures. Tecvac's exclusive vacuum processes offer a more permanent solution and the Tecvac-Singapore operations now promise a new look at the old problems of repair. Tecvac, Inc. is an internationally recognized leader in innovative repair techniques for concrete, masonry and stone using vacuum technologies.

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ecvac, Inc. presented its paper on Repairs of Concrete Structures Using Vacuum Technology to the th 25 Annual Conference of Our World In Concrete Structures. Attended by engineers from around the region and around the world, the conference was held on K the Island of Singapore. Call today for more Singapore, and its surrounding information. neighbor countries Tecvac, Inc. Office 703 742-9186

39482 Rickard Road Lovettsville, VA 20180 FAX 703 742-9231 toll free 800 847-9324

www.tecvacinc.net


Tecvac, Inc. Brings The Total Team To Your Project

W

hile architects have become more specialized and confine their practices to a few building types, and contractors have tended to be specialized in a few different disciplines, the Tecvac team will integrate the latest materials, systems and techniques to into your improvements. Some of the many team approach advantages which are seldom found with traditional acquisition methods are:  A specialized investigator of the problems who will work closely with your personnel to ascertain requirements…

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 A specialized designer for the specific task identified for retrofit or improvement… 

A specialized peer review of the architect and engineers renderings for coordination…

 A quality assurance team with oversight responsibility…  A value engineering team monitoring the project for prudent cost expenditures…

 A hard budget of costs expected to complete the project…  A contractor who is involved with the project from inception… The working team will establish the design criteria that will incorporate your firm in the evaluation and testing of specific design solutions. After the first phase report establishes the extent of the deficiencies, the revealed criteria and background studies will be used to develop concepts and alternative concept approaches. The validity of these concepts can then be tested with sketches and technical site drawings that demonstrate their feasibility and appropriateness for the condition. There is great advantage with this Total Team concept; construction drawings can be prepared while the work is begun; fast track construction with a thoroughly knowledgeable team and a fixed budget for completion. To discuss how we might assist you with your next restoration project, or a current problem you have with concrete, masonry or stone call us toll free. We will be glad to help.

Tecvac, Inc. 39482 Rickard Road Lovettsville, VA 20180

Office 703 742-9186

FAX 703 742-9231 toll free 800 847-9324 www.tecvacinc.net


Excerpts From APTA Rapid Transit Conference Structures Session

Unique Rehabilitation and Retrofit Procedures For Rail Transit Structures.

Tecvac, Inc. has been selected time and again for vacuum application of "Renew"… a patented Lithium Solution which is proven to attack Alkali Silica Reaction.

Miami, FL ⎯ "Rehabilitation and retrofit of aged and distressed rail-transit structures and facilities often calls for unique and innovative engineering solutions, if the requirements of the operating-system safety and reliability, and the construction economy, are to be optimally realized…The concrete deterioration was caused by alkali-aggregate reaction and by the deicing salts, in conjunction with the freeze-thaw damage. The novel vacuum -impregnation method was used to successfully restore integrity of the affected concrete and thus obviate the need for platform demolition and reconstruction…The slab is cast in place using 3500psi concrete…In some instances the Minnesota Avenue structural slab had deteriorated to such an extent that the core recovery with sufficiently long pieces for compressive testing was not possible…In a generalized sense, only two basic options were available: Remove the defective concrete and repour, or utilize a procedure capable of in situ restoration of concrete…This method is based on first creating a partial vacuum in the concrete, a suitable polymer resin is then introduced into the concrete-matrix. The resin fills the cracks, including micro cracks down to 0.001 inch and less…Control cores were taken before and 8hours after the completion of the impregnation operation. The cores were tested to yield a compressive strength ranging from 6,400 to 7,200 psi….the method was completely successful…susceptibility of rebar to corrosion was also significantly diminished…The rehabilitated slabs are reported to be performing well." ## For more information or the full report telephone toll free 800.847.9324.

TECVAC, INC. “Taking Quality To A New Level…Worldwide”

886 Rhonda Place, SE Leesburg, VA 20175 O -703.742.9186 F -703.742.9231 e-mail jeremy@tecvacinc.com


Before you even think about concrete, masonry or stone tearouts… consider this… TECVAC’STM PROPRIETARY INJECTION PERMEATION PROCESSES OFTEN MAKES THIS ACTION UNNECESSARY. At first glance, most conventional repair methods appear to work just fine. They may also appear to perform fairly well below the surface as well, but only to a certain depth and fineness of crack.. Tecvactm offers a proven process that repairs and restores concrete, masonry and stone more completely, more economically and more permanently.

Services Turn Key Design/In-Situ Retrofits Repair From Client Design and/or Performance Specifications Consulting Services Non-Destructive Testing and Survey with Impact Echo Technology

CONCRETE, MASONRY AND STONE RENEWAL AND REPAIR WITH THE POWER OF VACUUM TECHNOLOGIES

Future Technologies…Today

Before you even think of replacing that historic structure or landmark… consider this… TECVAC’STM PROPRIETARY INJECTION PERMEATION PROCESSES OFTEN MAKES THIS ACTION UNNECESSARY. Unlike conventional repairs, there is no residual damage or marring to the repaired surface. Adjacent surfaces are left in their original pristine condition. Moreover, if the damage gets deep, conventional repairs just won’t do the trick. Where aesthetics, structural integrity and permanence are paramount, the most advanced repair offered on the market today is Tecvactm.

Call For An Authorized Tecvactm Applicator

“Taking Quality To A New Level…Worldwide”

TECVAC, Inc. 39482 Rickard Road Lovettsville, VA 20180 Phone (703) 742-9186 Fax (703) 742-9231 Toll Free (800) 847-9324

“Taking Quality To A New Level...Worldwide”


NO COMPANY GETS IN DEEPER OR GETS IN FINER THAN TECVACTM NUMEROUS APPLICATIONS From parking garages and elevated mass transit platforms to highway and railroad bridges and deep tunnels, from monuments and landmarks to historic treasures of the world, vacuum technologies continue to prove their vast superiority for the renewal and repair of concrete, masonry and stone.

POWERFUL EFFECT OF VACUUM The Tecvactm Injection Permeation Processes will introduce modern repair resins into cracks and crack networks, porous and unsound concrete, masonry and stone defects by creation of a negative pressure atmosphere within the repair area. Pressure only techniques force the materials into the repair area…The Tecvactm Vacuum Processes draw the materials along using the nature of physics. The observable result is a fill and rebonding level unattainable by any other means.

NO COMPANY SUPPLYS QUALITY LIKE TECVACTM THE COMPANY Tecvactm is a second generation of new age technologies applied to the repair and renewal of concrete, masonry and stone structures. Initially developed in Europe in 1972, these advanced processes have been proven around the world. Because we are able to draw upon vast engineering sources for your particular needs, we can provide world class consultation, thorough research and creative solutions.

MILLENIUM TECHNOLOGY

EXTENSIVE CAPABILITIES

Consider the limiting qualities of most conventional pressure injection repairs. For closely aligned cracks, map pattern cracking and generally porous and unsound surface conditions, you will find pressure injection methods are severely wanting:

Tecvac, Inc. is a full service general repair contractor offering exclusive repairs, restoration and maintenance specialty services. Our staff of experienced engineers and technicians have been called upon around the world to confront an array of problems associated with concrete masonry and stone structures.

Little to no access to fine cracks below 0.004”

Low level fill from dead-end compression pockets.

Poor cure of resins from entrapped moisture.

Internal damage from liquid pressure build-ups. The Tecvac tm Injection Permeation Processes eliminate these inherent problems.

Horizontal filling from a 15’ core sample

High pressures are proven to significantly contribute to the extension of the existing fracture and the problematic cause of dialectic internal damages. Analytical studies and test results have found that pressure injection will only partially fill voids in dead end cracks at 30psi with only slight increases at 105psi. Once the fracture is mounted with the Tecvactm Process, all interconnecting cracks and voids will be filled.

DEEP COMMITMENT We participate in university research of new technologies applied to structural repairs. We are firmly pledged in our efforts to explore and develop new materials and new methods for superior analysis and repair. Call Today 1 800 847-9324


Tecvac, Inc. "Taking Quality To A New Level…Worldwide"

Vacuum Technologies For Repair of Concrete - Masonry - Stone

Solutions

WMATA Suitland Station - Washington, DC

PROBLEM 

Composite bond of topping slab to structural slab resulting from delamination.

Moisture intrusion at delamination interface.

Severely restricted access

Station opening threated with delay

SOLUTION 

Identify the delaminated areas. s

Access the delamination zone by drilling small holes

Evacuate moisture by intruding "hot" air through the delamination zone.

Apply vacuum force to the enclosed system and install acrylic repair resin using TecBondtm Interface Permeation Process.

Pull test repair areas to assure integrity of composite bond.


Tecvac, Inc. "Taking Quality To A New Level…Worldwide"

Vacuum Tecnologies For Repair of Concrete - Masonry - Stone

Solutions

Union Station Link Ramp Structure - Washington, DC

PROBLEM 

Severe and chronic leakage into the facility through cracks and expansion joint assemblies.

Deteriorated concrete

Broken prestressed tendons

Operations cannot be interrupted

SOLUTION 

Removal of the walkway

Design and rehabilitation of the expansion joint assembly

Shoring

Removal and replacement of deteriorated beam/column concrete.

Vacuum structural repairs with PermeJecttm Permeation Injection Process

Temporary signage and graphics for traffic routing to accommodate the work.


Tecvac, Inc.

Solutions

"Taking Quality To A New Level…Worldwide"

Vacuum Technologies For Repair of Concrete - Masonry - Stone

Tecvac Makes Problems Go Away - Bug

Holes

PROBLEM 

Precast column members displayed severe "bug holes" in the delivered product.

Numerous attempts by others could not achieve acceptable finish.

If the desired finish could not be achieved, the member would be rejected.

After

SOLUTION 

The failed materials were removed from the members

Polymer modified grout was colored to match the member

The member was prepared and scrubbed with the color matching repair material and allowed to cure.

High pressure water was applied to the repaired area and examined for damage and scour.

Before


Tecvac, Inc. "Taking Quality To A New Level…Worldwide"

Vacuum Technologies For Repair of Concrete - Masonry - Stone

Meridian Hill Park - Washington, DC

PROBLEM 

Cracking in exposed aggregate members allow water intrusion and freeze thaw.

Concrete is historic and presents no tolerance of marring existing surfaces.

Exposed aggregate concrete.

Areas of closely spaced map cracking.

Fractures below 0.001" width.

SOLUTION 

Install thermally activated seal to discrete cracks.

Vacuum inject the individual fractures.

Evacuate moisture by intruding "hot" air through the enclosed repair zone.

Impregnate the entire member with acrylic resin using vacuum force processes of PermeNewaltm.

Solutions


Before you even think about concrete, masonry or stone tearouts… consider this… TECVAC’STM PROPRIETARY INJECTION PERMEATION PROCESSES OFTEN MAKES THIS ACTION UNNECESSARY. At first glance, most conventional repair methods appear to work just fine. They may also appear to perform fairly well below the surface as well, but only to a certain depth and fineness of crack.. Tecvactm offers a proven process that repairs and restores concrete, masonry and stone more completely, more economically and more permanently.

Services Turn Key Design/In-Situ Retrofits Repair From Client Design and/or Performance Specifications Consulting Services Non-Destructive Testing and Survey with Impact Echo Technology

CONCRETE, MASONRY AND STONE LEAK REPAIRS USING THE POWER OF ADVANCED METHODS AND MATERIALS

Future Technologies…Today

Before you even think of replacing that historic structure or landmark… consider this… TECVAC’STM PROPRIETARY INJECTION PERMEATION PROCESSES OFTEN MAKES THIS ACTION UNNECESSARY. Unlike conventional repairs, there is no residual damage or marring to the repaired surface. Adjacent surfaces are left in their original pristine condition. Moreover, if the damage gets deep, conventional repairs just won’t do the trick. Where aesthetics, structural integrity and permanence are paramount, the most advanced repair offered on the market today is Tecvactm.

Call For An Authorized Tecvactm Applicator

“Taking Quality To A New Level…Worldwide”

TECVAC, Inc. 39482 Rickard Road Lovettsville, VA 20180 Phone (703) 742-9186 Fax (703) 742-9231 Toll Free (800) 847-9324

“Taking Quality To A New Level...Worldwide”


STUBBORN LEAKS ARE NO MATCH FOR TECSEALTM NUMEROUS APPLICATIONS The basement of the Veterans Administration Headquarters Building leaked for 40 years…Tecvactm technicians had it dry in 8 days! Numerous contractors attempted to resolve chronic leaks at Union Station in Washington DC…Tecvac repairs have been dry for over 10years.

POWERFUL EFFECT OF VACUUM The TecSealtm Leak Injection Repair Processes will introduce modern repair resins deep into leaking cracks and crack networks using negative forces. Couple with an ultra-thin expanding repair resin and the results are an unparalleled means of permanently stopping leaks. Pressure only techniques force thick materials into the repair area…The Tecvactm Vacuum Processes draw the materials along, using the nature of physics. The observable result is a level of fill unattainable by any other means.

MILLENIUM TECHNOLOGY Unlike conventional pressure methods using urethanes, TecSealtm is a peerless negative force process that situates specially formulated repair resins, often without the necessity of drilling or marring the surface of the repaired area. Consider that pressure injection methods are severely wanting :  

High material viscosities offer little to no access to fine cracks below 0.004” Low level fill from dead-end compression pockets.

Poor cure of resins from too much/too little moisture.

Dry out shrinkage over time with restart leakages and re-repair. The Tecvac tm Injection Permeation Processes eliminates these inherent problems.

TECVACTM STOPS LEAKS WHERE OTHERS FAIL THE COMPANY Tecvactm is a second generation of new age technologies applied to the repair and renewal of concrete, masonry and stone structures. Initially developed in Europe in 1972, these advanced processes have been proven around the world. Because we are able to draw upon vast engineering sources for your particular needs, we can provide world class consultation, thorough research and creative solutions.

EXTENSIVE CAPABILITIES

Chronic Leakage Through 48" Beam Connection

Even the thinnest urethanes are no match for our ultra-thin expanding esters; it’s like honey and water. In a dry environment, urethanes will notably shrink and pull away from side walls. This is problematic with urethane repair resins. If, and in most cases when, the water returns… so does the leak. Our repair materials have little to no shrinkage after drying. But, when the water does return, these unique esters will rehydrate and swell again…stopping the leak. Urethanes just won’t do that.

Tecvac, Inc. is a full service general repair contractor offering exclusive repairs, restoration and maintenance specialty services. Our staff of experienced engineers and technicians have been called upon around the world to confront an array of problems associated with concrete masonry and stone structures.

DEEP COMMITMENT We participate in university research of new technologies applied to structural repairs. We are firmly pledged in our efforts to explore and develop new materials and new methods for superior analysis and repair. Call Today 1 800 847-9324


DETERIORATED COLUMNS RESTORED WITH TECVAC, Inc.'s PERMENEWALtm PERMEATION PROCESS

Unique Process Restores Structural Integrity To Badly Deteriorated Columns

Bethesda, MD - In-situ rehabilitation and deep sealing of concrete columns has been completed at the parking facility located at the National Navy Medical Center. In cooperation with FDE, Ltd., Washington based structural engineers, McMullan & Associates, determined that the concrete deterioration was caused by a combination of deicing salts and freezethaw damage. The PermeNewaltm Permeation Injection Process was used to successfully restore integrity of the affected concrete and thus averted the need for demolition and reconstruction. The vacuum permeation method applied to the columns caused minimal disruption to the facilities and other contractors performing work at the project site. This is a perfect repair process where closely aligned cracks prohibit their individual repair. A solitary crew can set up and repair 800 to 1000 square feet of horizontal distress in a single shift with PermeNewaltm This unique and proprietary method is based upon creating a negative force in the concrete while introducing a polymer resin deep into the concrete-matrix. The resin fills the cracks, including micro cracks, down to and below 0.001 inch. In addition to the restoration and increase in structural integrity, the process also vastly decreases the susceptibility of imbedded reinforcing bars to corrosion. For more information telephone toll free. 800.847.9324.

TECVAC, Inc. “Taking Quality To A New Level…Worldwide”

39482 Rickard Road Lovettsville, VA 20180 O-703.742.9186 F -703.742.9231 email - jeremy@tecvacinc.com


THE CRACKMASKTM CONCEALMENT PROCESS HIDES STRUCTURALLY REPAIRED CRACKS Washington, DC  CleanSettm is a specialty repair technique that has been developed by Washington based TECVAC, Inc. to structurally restore concrete, masonry and stone without the surface disfiguring typical with conventional injection. After the injection process is completed, the crack can now receive a distinctive polymer coloration compound that blends the surface tone of the repaired fracture to match the color of the member. On most materials and surfaces, the repaired crack becomes nearly invisible with CrackMasktm.

WMATA - Naylor Road Branch Station

By Closely Matching The Color and Texture Of The Repaired Member Cracks Repaired With TECVAC, Inc.’s CleanSettm Process Are Concealed With CrackMasktm.

The CleanSettm Permeation Process has proven a substantial benefit to the repair industry. The usual prepatory sealing materials placed on both sides and a long the crack line have been eliminated. Using CleanSettm there is no grinding, brushing or defacing normally resulting from conventional pressure injection methods. The fracture remains pristine after the completion of the repair. Using a proprietary polymer finish material, CrackMasktm renders the cracks nearly imperceptible. Thermally incited, the polymer material also forms a tough protective seal that closely matches the color and texture of the member. The CrackMasktm Concealment Process can be used to seal and disguise many types of fractures. CrackMasktm is the result of TECVAC, Inc.’s active R&D efforts in cooperation with Lane Construction Company and The Washington Metro Area Transit Authority. ## For more information call toll free 800.847.9324.

TECVAC, Inc. “Taking Quality To A New Level…Worldwide”

39482 Rickard Road Lovettsville, VA 20180

O-703.742.9186 F -703.742.9231 email - jeremy@tecvacinc.com


TECVAC, Inc. Blends Away Unsightly “Bug Holes” On Precast Concrete Columns

After

Before

PatchMatchtm - A Unique Blending Of Polymer Modified Repair Materials Has Been Used To Fill “Bug Holes” On Precast Concrete Members.

Richmond, VA  TECVAC, Inc. has developed a unique blending of polymer modified repair materials known as PatchMatchtm that can closely harmonize a number of types of concrete repairs to the adjacent member or substrate. After an attempt to rub with cement and sand had failed to fill and adequately repair excessive surface air voids, Concrete Structures, Inc. was faced with replacing a number of erected members. TECVAC, Inc. was called upon to provide a repair. TECVAC, Inc.’s technicians applied a Sika brand repair mortar, combined with a proprietary mix of coloring agents and cement to the sandblast finished surface. The consistency of the material was made soupy and easily scrubbed into the voids. When the infill material was fully cured, the surface was lightly abrasive blasted. This activity removed the material from the surface of the member, but more importantly, left a smooth and unnoticeable filling of the “Bug Holes”. TECVAC, Inc. provides a wide spectrum of PatchMatchtm color samples that can match most concrete members. When cured, the repair material presents no compromise of strength. With long term warranties available, objectionable repairs should be a thing of the past when you choose PatchMatchtm for your next repair project. ## For more information call toll free 800 847-9324.

TECVAC, Inc. “Taking Quality To A New Level…Worldwide”

39482 Rickard Road Lovettsville, VA 20180 O-703.742.9186 F -703.742.9231 email - jeremy@tecvacinc.com


NON-SACRIFICIAL GRAFFITI COATING IS INVISIBLE AFTER APPLICATION TO WALL

The Virginia Highway Department Required A Grafitti Coating Application Without Changing The Color of The Concrete Being Treated.

Fairfax, VA  A virtually invisible application technique has been developed by Washington, DC based TECVAC, Inc. for the application of graffiti coating to concrete, masonry and stone surfaces. The requirements of VDOT were straight forward; give us graffiti protection and don’t change the color of the concrete. After pre-testing a number of different methods, a method/product combination resulted in an application that was very nearly invisible. When the first phase of the application was completed, a slight darkening of the surface, a wet appearance, was evident. Overnight, the evidence disappeared however and side by side comparison of treated/untreated concrete panels were indistinguishable. Removal of spray paint was a snap with a low pressure power washer. The long fly over abutment wall was completed and now stands protected. As a testament to the transparency of the application, when the project was completed, a VDOT inspector noted on the punch list that it did not look like the antigraffiti coating had been applied to the abutment walls as required! If your building or structure requires graffiti protection, please telephone us today toll free 800 847-9324.

TECVAC, Inc. “Taking Quality To A New Level…Worldwide”

39482 Rickard Road Lovettsville, VA 20180 O-703.742.9186 F -703.742.9231 email - jeremy@tecvacinc.com


Connecticut DOT Repairs I-84 Pier Cap

A

fter detecting serious cracking on a number of I-84 pier caps the Connecticut Department of Transportation sought a means of completely filling the fractures and voids.

construction joint and point of inevitable failure. Notwithstanding, previous attempts fouled the mouth and fracture zone, seemingly prohibiting any hope of reinjection of the cracks.

Final preparation of the vacuum injection of the pier caps was begun. This preparation included the continuity audit of the existing cracks to determine the expected filling.

Vacuum injection proves to be the answer Technicians drilled behind the unsuccessful pressure injection and

Shallow Epoxy Injection of Cracks

Of the five cells, two promised installation of new repair materials across the entire 14’ thickness of the cap. Upon beginning the injection of the first cell, the extent of the void areas began to develop. The first cell to be injected took in excess of 60 gallons of the low viscosity repair resin before reaching refusal. In all, the single pier cap was permeated with some 200 gallons of repair resins. In one of the cells, technicians successfully pulled resins through the entire thickness of the cap, some 14’. Despite the surprising condition, The massive pier caps were eight feet high, thirty five feet wide and fourteen feet thick connecting five cells of the structure. Observation inside the cells revealed the failure of previous pressure injection efforts. This created a problem that most would agree has no apparent resolve. Failed epoxy, or insufficient fill of epoxy in individual fractures is something one is stuck with when discovered. Epoxy will not stick to epoxy which, when attempted, yields a

intersected the fracture zone. The existing epoxy seal, that had been left in place was inspected and all unbonded lengths were sealed. A special methodology of testing the length and extent of the cracking was employed on each individual crack in the pier cap prior to beginning the injection. It was confirmed with Connecticut DOT that the previous injection of the cracks was at best marginal with penetration depths ranging from ¼” to 6”.

Resin @ +12” Depth

previous failed attempts, confined space restraints and complicated access coordination this was a difficult job well done.

Tecvac, Inc. 703 742-9186 Toll Free 800 847-9324


Restoration of Historic Stone Arch Bridge Repairs are now completed on Delaware State Bridge Number 1A in Wilmington. Wilmington, DE  Vacuum technicians have now completed historic restoration of a 19th century stone arch bridge located on Rising Sun Lane. The earth filled structure, built in 1883, serves as the south approach for a larger steel truss bridge and carries about 30 feet of roadway some 25 feet above the overflow channel for the river flood plain. During inspection of the bridge arch in early 1993, large voids with multiple missing stones were found to be common. Voids exposed by the missing stones were found to be vast, some as large as 2 square feet with penetrations up to 22 inches into the arch fill. Furthering the apparent seriousness of the existing condition were mortar losses and openings between the stones up to 4 inches, which caused many areas where the stones had slipped down in the arch but not yet fallen. Subsequent load rating analysis determined the structural capacity of the bridge over stressed due to its own dead load. It was further determined that restoring the structure to its original condition would not be adequate to restore structural capacity for the existing dead load. Because the historic two lane structure was situated on a main thoroughfare serving thousands of commuters per day, and because of the delicate repairs required, a rehabilitation process which could provide a higher strength mortar to fill all existing voids in the structure was required. Short of tearing down and rebuilding the structure, vacuum processes were the only alternative method of repair. It was believed that conventional methods of pressure grouting of the structure would apply unwanted stresses to the structure, causing further damages and catastrophic displacement. From its offices near Washington, DC, TECVAC, Inc. performs its’ vacuum repair processes around the world and is a regular contributor to the advancement of leading edge technologies in the investigation and repair of concrete, masonry and stone structures. ##

TECVAC, INC. 39482 Rickard Road Lovettsville, VA 20180 O -703.742.9186 F -703.742.9231 e-mail jeremy@tecvacinc.com


Bay Bridge Repairs Suspended Until Spring

T

he season has come and gone on the underwater repair of piles on the Chesapeake Bay Bridge. Because of cold water and continuous inclement weather, technicians have demobilized the void and crack repair project until spring. Not before performing a thorough survey of the pier where the work was begun however. From the extent of the disrepair encountered on just one of the two main piers, it looks like the spring will be a busy time. After cleaning the face of the mammoth pier, a host of unscheduled cracks and voids were measured and documented. “Some of the cracks are huge and there is one void big enough to drive a car into.” Says SMS dive technician supervisor James Michel. . Indeed, a void in the support footing of the pier measures out at 35’wide, 19’deep and 7’-8’ high. Technicians intend to begin filling the void upon their arrival in April 98’.

destined to revolutionize the underwater crack repair market. Unlike conventional pressure systems currently used for these repairs, technicians will induce negative pressures in the fracture zone prior to the introduction of repair materials. Analytical studies and test results have found that pressure injection will fill on 70% of the void area at 30psi and only increases to 85% level of fill at 105psi. Further, high pressures are proven to contribute significantly to the extension of repaired fractures and add to internal damage. In some cases the entire member has been destroyed with the application of higher pressures in an attempt to get repair material deeper into the fracture. Promising deeper penetrations at competitive prices is just what the industry needs. Vacuum repair applications world wide attest to the success of these processes. Now, this “second generation” of proprietary vacuum processes by TECVACtm will no doubt meet the challenges posed by the problems with concrete, masonry and stone.

Does It Go All The Way Through? How Do You Know? That was the question presented when visual examination of a 12’ diameter column displayed a crack on one side and a seemingly aligned crack on the other side. TECVACtm technicians came up with the method to answer this question. By installing a proprietary skirting method around the column and applying negative pressure to the skirt, the crack was found to, in fact, penetrate the entire thickness of the column. Moreover, technicians were able to confirm the ability to introduce repair resins into the fracture with total assurance of penetration through to the other side. You are invited to pose your problem to a TECVACtm representative.

TECVAC, Inc. TECVACtm Repair Methods Leading Edge Technologies For the Repair of Concrete Masonry and Stone Buildings Dams Water Treatment Facilities Bridges Parking Garages Tunnels Piers Sculptures

Additionally, diving repair technicians intend to employ TECVAC’stm proprietary method of underwater crack injection

Phone Today for a Full Presentation and Consultation

703 742-9186 - 800 847-9324 Vacuum Technology Report - Page 3


Grave Stones From George Washington’s Ancestral Graveyard Are Being Renewed By TECVAC, Inc.

Grave Stone Marker Of Mrs. Caroline Barret

TECVAC, Inc. is applying its exclusive vacuum technology to repair grave stones from historic Warner Hall Cemetery in Gloucester County Virginia .

Reconstruction After Cleaning

Gloucester, VA  The grave stone of Mrs. Caroline Barret, a distant cousin of the first President of the United States, is one of several deteriorated stone grave markers located in the Warner Hall Cemetery. The stones are suffering from the affects of environmental pollution and centuries of weathering. Each of the historically significant markers located at the site will be repaired and stabilized using the exclusive vacuum force technologies developed by TECVAC, Inc.. Mrs. Barret was born in 1783 and died in 1811. Her cracked and deteriorated granite stone marker will be the first of the lot to undergo a thorough renewal. Each of the stones will receive SoftSoaktm vacuum cleaning, repair of individual cracks with PermeJecttm, reconstruction of missing form with PatchMatchtm and consolidation stabilization with PermeNewaltm to mitigate further deterioration. Structural restoration methods employed by TECVAC leave no trace of the repair and can actually hide cracks and damages. A total of 13 gravestones will be repaired. Warner Hall Cemetery is the resting place of Augustine Warner, born 1610-11, Augustine Warner II, born 1642 and other members of the Warner and Lewis Families. Among their descendants are George Washington, Robert E. Lee and Queen Elizabeth II. George Washington’s maternal grandmother, daughter of Augustine Warner II, is also buried at the site. Owned by The Association For The Preservation of Virginia Antiquities, Warner Hall Cemetery is located just south of Warner Hall Plantation near Ordinary, Virginia. ## For more information telephone toll free 800.847.9324.

TECVAC, Inc. "Taking Quality To A New Level…Worldwide"

39482 Rickard Road Lovettsville, VA 20180 O-703.742.9186 F -703.742.9231 email - jeremy@tecvacinc.com


Tecvac, Inc.'s CleanSettm and PermeJecttm Permeation Injection Process Repairs Stone On Historic Williamsburg Bridge Monday, July 11, 2011 New York City, NY  The PermeJecttm Permeation Injection Process is a specialty vacuum injection application technique developed by Washington, DC based TECVAC, Inc. to methodically and efficiently restore composite bond to fractures in concrete, masonry and stone; and in this case, the CleanSettm Method enabled the repairs to be completed without leaving remnants of the completed repair on the historic stone. The process totally restores the interface bonding of the fractured materials without the need for any sort of aftermath surface marring. Where appearance is always of significant importance, CleanSettm is a bright alternative to conventional epoxy pressure injection means to make structural repairs on highly visible members . In this instance, the fine cracks in the stone were setup to accommodate the vacuum, permeated with acrylic resin and de-mobed in just hours…leaving no visible evidence of restitution. Where you need an obscure repair, CleanSet tm is the only method that will restore composite bond to concrete, masonry or stone and leave an unmarred surface. Call or email Jeremy today (Jeremy@tecvacinc.com)…he will be happy to discuss your unique situation.

TECVAC, Inc. www.tecvacinc.net 39482 Rickard Road Lovettsville, VA 20180 Office 703 742-9186 Fax 703 742-9231 Toll Free 800 847-9324


It would benefit your survey to drill core holes into every part of your project. Practical? Consider this… TECVAC’S IMPACT-ECHO SURVEY CAN PROVIDE UP TO 500 SIMULATED CORE EXTRACTIONS IN A SINGLE DAY. A single core from a 20,000 sf span of concrete floor would do little good in establishing the extent of disrepair. A thousand would be nice but still inadequate. TECVAC, INC. can produce a color coded grid map and condition report of the entire area in just three days; with simulated core extractions performed every 5’.

Before you specify a repair method, get all the information you can. Accurate investigation guides the proper repair…consider this…

Services Turn Key Design/In-Situ Retrofits Retrofit From Client Design and Performance Specifications

NON-DESTRUCTIVE TESTING & SURVEYING WITH THE DOCter.

Consulting Services Non-Destructive Testing and Survey with Impact Echo Technology Forensic Investigations

Future Technologies…Today with

Impact Echo

Call For An Authorized TECVACtm Applicator

THE DOCTERTM AND IMPACT ECHO

TECHNOLOGY WERE SELECTED FINALIST IN THE “CONSTRUCT CANADA 94’ INNOVATIVE AND TECHNOLOGY AWARD” There is nothing on the market today that can provide condition information with the reliability and accuracy of Impact-Echo Technology.

“Taking Quality To A New Level…Worldwide”

TECVAC, Inc. 39482 Rickard Road Lovettsville, VA 20180 Phone (703) 742-9186 Fax (703) 742-9231 Toll Free 800 847-9324 http://tecvacinc.net



“Taking Quality To A New Level…Worldwide”


NOTHING FINDS YOUR VOIDS LIKE THE DOCTERTM

DEFECT ORIENTATION CONFIRMATION TESTER The DOCtertm introduces a short duration stress pulse into the test object by technical impact on the surface.

ABILITIES

NOTHING FINDS YOUR FLAWS LIKE THE DOCTERTM EXPERIENCE

TECVAC, Inc. is a full service repair, restoration and maintenance specialty contractor. Our staff of experienced engineers and technicians have been called upon around the world to confront an array of problems associated with concrete masonry and stone structures.

TECHNOLOGY Impact Echo Technology utilizes an extremely advanced method of nondestructive testing that will provide the necessary background data for assisting the engineer in making the right decisions for an optimum repair strategy. Some of the most common applications are: 

Delamination surveys of slabs.

Sandwiched membrane integrity.

Crack, void & honeycombing detection.

Surface opening crack depth measurement.

Debonding of topping slabs.

Thickness measurements

Injection quality of cable ducts

A compression wave travels into the object and is reflected by internal defects or external boundaries, propagates back to the surface and again into the test object by which a transient resonance condition is set up as multiple reflections occur. This information is picked up by a transducer placed close to the impact point, processed and presented in graphic form.

Each of our technicians are carefully trained in the use of Impact-Echo at Cornell University. Our technicians performed the most extensive Impact-Echo survey ever performed in Taipei, Taiwan for the Dept. of Rapid Transit Systems.

BACKGROUND Originally developed at the National Institute of Standards and Technology, our technicians have performed thousands of shots on a diverse range of structures and members.

COMMITMENT We have the know how and the practical experience to service your individual requirements with concise information. Impact Echo Principal

Call Today 703 742-9186


HIDDEN PROBLEMS ARE THERE…YOU JUST DON’T SEE THEM.

Visually Identified Surface Cracks Provide Little Evidence of Hidden Problems

HIDDEN PROBLEMS ARE THERE…YOU JUST DON’T SEE THEM.

As Seen On The Surface

The DOCter SEES! Non-Destructive Testing With Impact-Echo Technology CALL TECVAC, INC. TODAY

Poor Consolidation

800 847-9324 www.tecvacinc.net

Off 703 742-9186 Fax 703 742-9231

Imbedded Form Wood


Tecvac, Inc. Develops Its Hotboxtm Which Will Dry Wet Cracks Prior To Injection Repair

6.8%

Washington, DC - Tecvac, Inc. has developed a portable unit called a Hotboxtm to dry fractured concrete prior to installing repair resins. While bringing topping concrete back into composite with structural concrete using its exclusive TecBondtm Interface Permeation Process, Tecvac technicians encountered water at the delaminated interface. The acrylic resin used to bond the interface (methyl methacrylate) is very sensitive to moisture. When relative humidity is high, excessive dampness is usually removed by pumping nitrogen gas through the enclosed system. However, in this instance, the water proved too much for the gas to lower the humidity in the zone to an acceptable level. Letting nature take care of the drying would impose unacceptable delays. Water insensitive epoxies were considered, but there were many questions raised about their claim of insensitivity and epoxy's ability to displace water. At the forefront of the discussion was the simple physics- if a concrete pore is full of water then nothing else can be in the pore. After a period of brainstorming, it was determined that raising the air temperature within the zone by 18ยบF. (10ยบC.) will reduce relative humidity by 50%. Tecvac technicians built its prototype Hotboxtm. With proper air circulation, the super heated air introduced into the enclosed system captured and exhausted the moisture laden air. This exchange quickly lowered the humidity in the delamination zone to 43%, and in some longer exposed instances, as low as an unbelievable 6.8%. The Hotboxtm will be available 2004.

Tecvac, Inc. is a supplier of high quality advanced technology services to the concrete repair industry. Tecvac's key products include PermeJecttm, PermeNewaltm and TecSealtm processes for the more permanent repair of concrete masonry and stone. For more information contact Jeremy at 703.742.9186 or toll free at 800.847.9324.

TECVAC, Inc. 39482 Rickard Road Lovettsville, VA 20180 Office 703 742-9186 Fax 703 742-9231 Toll Free 800 847-9324 www.tecvacinc.com


PermeNewaltm Permeation Impregnation Process Selected by Pennsylvania DOT To Treat ASR Affected Concrete Bridge Friday, October 10, 2003 Johnstown, PA  The PermeNewaltm Permeation Impregnation Process is a specialty application technique developed by Washington, DC based TECVAC, Inc. to methodically and efficiently impregnate liquids into horizontal and vertical surfaces. Using a negative force vacuum, the process enables deep penetration of repair materials into a variety of concrete, masonry and stone members. In this instance, the method is being used to apply Renew Concrete Treatment to alkali silica reactive concrete abutment walls, sidewalks, parapet barriers and bridge deck on the Prospect Ave. Viaduct located in Johnstown, PA. ASR, as it is known, is a condition where the stone in the concrete matrix reacts with alkali in the cement to form a moisture absorbing and expansive gel around the stone. The expansive activity will continue as long as there is moisture available to feed the reaction. Renew Concrete Treatment has demonstrated its ability to chemically mitigate ASR in new concrete and existing structures. Coupled with Tecvac Inc.'s proprietary processes, Renew Concrete Treatment promises new life to existing concrete affected by ASR.

TECVAC, Inc. 39482 Rickard Road Lovettsville, VA 20180 Office 703 742-9186 Fax 703 742-9231 Toll Free 800 847-9324


PermeNewaltm Process Shuts Down Capillary Action By Deeply Penetrating Cast Stone

Water Rolls Off Treated Window Ledge Stone

Cast Stone Window Ledge Repaired With TECVAC, Inc.’s PermeNewaltm Permeation Injection Process Demonstrates Ability To Restore Structural Integrity and Shut Out Water.

Washington, DC  TECVAC, Inc. permeated a deteriorated cast stone window ledge at the Fountain Condominiums Complex to demonstrate the ability of PermeNewaltm to restore and seal. The PermeNewaltm Permeation Injection Process is a specialty repair technique developed by Washington based TECVAC, Inc. to structurally restore large areas of deteriorated concrete, masonry and stone. The vacuum process enables the restoration of deteriorated materials that would normally require demolition and replacement. Closely aligned map cracking and similar damages can now be renewed. The 8”x 8”x4’ long window ledge demonstrates a convincing testimony of the ability of PermeNewaltm to permeate deep into damaged materials. In just over 10 minutes the test piece accepted a full two gallons of repair resin, affirming the porosity and vulnerability of the 30 year old material. Visual examination of a cross section revealed resin penetration to a depth of 90% of the total mass and rendered the material brick hard. Water applied to the treated stone beaded and ran off while the untreated material absorbed like a sponge. A significant alternative to removal and replacement, PermeNewaltm will require no entry into the occupied space and is estimated to save hundreds of thousands of dollars to the owners. A ten year guarantee is proposed. ## For more information telephone toll free 800.847.9324.

TECVAC, Inc. "Taking Quality To A New Level…Worldwide"

39482 Rickard Road Lovettsville, VA 20180 O-703.742.9186 F -703.742.9231 email - jeremy@tecvacinc.com


Tecvac, Inc. Replicates Historic Exposed Aggregate Concrete For Repairs Monday, February 3, 2003 Washington, DC ď‚ž Tecvac, Inc. is replicating historic exposed aggregate concrete to repair damaged concrete members at Meridian Hill Park. Contractor John J. Earley, who served as President of the American Concrete Institute in 1938, inaugurated the process of mixing specially selected aggregates of different colors and sizes in the concrete, pulling the forms as soon as the mix was firm and then wire brushing and acid washing the surface to expose the aggregate texture. The park is unique in the fact that it served as a laboratory for experimenting with a new medium of construction; exposed aggregate concrete. Designed and built between the years of 1912 to 1936, the park has been under the jurisdiction of the National Park Service since 1933. Tecvac, Inc. offers a number of proprietary restoration processes utilizing vacuum force technology. Some of these processes are capable of restoring structural integrity to cracked and degenerative concrete with little or no marring or defacement of the member. For more information phone:

TECVAC, Inc. 39482 Rickard Road Lovettsville, VA 20180 Office 703 742-9186 Fax 703 742-9231 Toll Free 800 847-9324


Washington Metropolitan Area Transit Authority Bridge Bearings Inspected Attention Arlington, VA - Inspection doors are installed for the Washington Metropolitan Area Transit Authority to visually examine bridge bearings. When misalignment of structures was observed, it was discovered by WMATA inspectors that the roller bearing assembles used to support the bridge structure were not accessible. The original construction encapsulated the assemblies within the members. Now, there was no way of determining the condition of the bearings The reinforced concrete sidewalls of the beams were thirty inches thick. This posed a formidable task to install access doors at each of the bearing locations along the route into Washington Reagan National Airport. A series of six 6” cores were extracted from each location and the solid 2’x2’ block was removed. The edges were saw-cut and pneumatically chipped smooth. Heavy pre-fabricated steel doors were installed and secured with 1” drop anchors that were epoxied into drilled holes. A total of 366 doors were installed and all of the bearings were inspected. Eight bearings were found to be suspect and four were later replaced. To discuss your particular problem, call Jeremy at 703 742-9186.

TECVAC, Inc. 39482 Rickard Road Lovettsville, VA 20180 Office 703 742-9186 Fax 703 742-9231 Toll Free 800 847-9324


PERMEJECTtm PERMEATION IMPREGNATION PROCESS USEFUL FOR REPAIR OF ANTENNA SUPPORT PADS Smithsonian and Astrophics Observatory Consult With TECVAC, Inc.

Hilo, HI ď‚ž TECVAC, Inc. is consulting with the Smithsonian for materials and services to deep seal support pads for a dozen new Submillimeter Array Antennas. Twenty-one permanently positioned concrete antenna support pads were cast at the site on Mt. Hilo and now require modification and repairs. It is feared the cold joints and other deficiencies produced during the two phase casting operation will allow moisture and dust particles into the sensitive monitoring devices to be installed later. Tecvac, Inc. was consulted because its exclusive PermeJecttm Vacuum Injection Process has proven to fill the deepest and narrowest fractures more thoroughly and more permanently than conventional methods. This unique and proprietary method is based upon creating a negative force in the concrete fracture or void, while introducing an ultra-thin polymer resin deep into the concrete-matrix. The resin fills the cracks, including micro cracks, down to and below 0.001 inch. In addition to the restoration and increase in structural integrity, the process also vastly decreases the susceptibility of imbedded reinforcing bars to corrosion. Positioned high on the mountain at just under 10,000 feet elevation, the support pad repairs pose a real challenge for Tecvac technicians. The work day is short at just four hours per day and the entire site is extremely delicate with regards to aesthetic and environmental issues. For more information telephone toll free 800.847.9324.

TECVAC, INC. 39482 Rickard Road Lovettsville, VA 20180 O -703.742.9186 F -703.742.9231 e-mail jeremy@tecvacinc.com


Tecvac, Inc.'s Metered Saturation Soaktm Used To Treat Over Four Million Square Feet of ASR Affected Concrete Monday, November 18, 2002 Ft. Campbell, KY  The Metered Saturation Soaktm is a specialty application technique developed by Washington, DC based TECVAC, Inc. to methodically and efficiently apply liquids to mass areas in precise quantities. Using a 7,500 gallon tanker truck, the computerized system coordinates the spray nozzles out-flow with the speed of the vehicle to meter exact quantity applications. In this instance, the method was used to apply Renew Concrete Treatment to almost 100 acres of alkali silica reactive concrete. ASR, as it is known, is a condition where the stone in the concrete matrix reacts with alkali in the cement to form a moisture absorbing and expansive gel around the stone. Until recently, there has been no promise of remission. The expansive activity would continue as long as there was moisture available to feed the reaction. However, FMC Corporation has developed and patented its lithium based Renew Concrete Treatment that has demonstrated its ability to chemically mitigate ASR in new concrete and existing structures. When coupled with Tecvac Inc.'s proprietary processes, FMC's Renew Concrete Treatment promises new life to existing concrete affected by ASR.

TECVAC, Inc.

39482 Rickard Road Lovettsville, VA 20180 Office 703 742-9186 Fax 703 742-9231 Toll Free 800 847-9324


Tecvac, Inc.'s PermeJecttm Vacuum Permeation Impregnation Process Employed To Repair Cracks In Maryland Transit System Monday, November 4, 2003 Baltimore, MD ď‚ž The PermeJecttm Vacuum Permeation Impregnation Process is a crack repair technique developed by Washington, DC based TECVAC, Inc. to methodically and efficiently install repair resins into the finest fractures. Using powerful vacuum force and specialty repair resins, the process eliminates a number of the problems normally associated with conventional pressure methods and epoxy resins, not the least of which is the elimination of internal damages caused by the effects of induced high pressures. The industry touts "low pressure is better" and the technological advantages of using low pressure are well documented. Now, Tecvac, Inc's vacuum (negative) processes over conventional pressure (positive) techniques are even more numerous. Unlike pressure injection, the vacuum processes withdraw air and moisture from cracks prior to the installation of appropriately selected repair resins. Where excessive moisture is encountered, it can be evacuated with Tecvac's Hotbox tm prior to resin installation. The tendency to burst the damaged member, so characteristic of conventional pressure methods by compressing the liquid repair resin, is now totally eliminated.

TECVAC, Inc.

Using the PermeJecttm Process, there is no residual

39482 Rickard Road Lovettsville, VA 20180 water or stress concentrations at the ends cracks and it Office 703 742-9186 Fax 703 742-9231 Toll of Free 800 847-9324 situates the resin into the finest crack and associated crack


TECVAC, Inc. Selected To Perform Repairs at Ronald Reagan Washington National Airport

Washington Ronald Reagan National Airport

Leaking Fractures In A Newly Cast Concrete Pedestrian Tunnel Are Repaired With TECVAC, Inc.’s Vacuum Force TecSealtm Permeation Leak Seal Process.

Washington, DC  TECVAC, Inc. has applied its exclusive TecSealtm Permeation Leak Repair Process to leaking fractures located in the walls and floor of a pedestrian tunnel being completed at the newly renamed Washington Ronald Reagan National Airport. The peerless vacuum process was used to draw a low viscosity expanding vinyl ester repair resin into the wet fractures. This combination of vacuum induction, with water thin repair resin, conveyed a number of advantages over conventional pressure injection. TecSealtm situates the resin into the finest width of cracks, smallest voids and interconnected micro fissures by manipulating flow within the fracture. The vinyl ester resin does not chemically react with water like polyurethane, so there is no foam layer to reduce adhesion or prohibit the capillary activity generated by the negative actions of the process. URS Griner, the project engineers, chose TecSealtm instead of the pressurized application of polyurethane grouts, typical for this type of leak repair. Because TecSealtm establishes negative pressures and sets up distracted flows within the fracture zone, the repair resins can be influenced into deeper and more intricate network penetrations. The TecSealtm Process promotes intimate bonding, deep invasion and lasting permanence, often with only surface mounted induction ports. ## For more information telephone toll free 800.847.9324.

TECVAC, Inc. “Taking Quality To A New Level…Worldwide”

39482 Rickard Road Lovettsville, VA 20180 O-703.742.9186 F -703.742.9231 email - jeremy@tecvacinc.com


TECVAC, Inc. Blends Polymer Patch Colors To Closely Match The Substrate

WMATA - Naylor Road Station

PatchMatchtm - A Unique Blending Of Polymer Modified Repair Materials Has Been Installed On A Washington, DC Metro Station

Washington, DC  TECVAC, Inc. has developed a unique blending of polymer modified repair materials known as PatchMatchtm that can closely harmonize concrete repairs to the adjacent member or substrate. A number of patches had been previously installed at a new metro station being constructed by Lane Construction using Sika Corporation’s powdered repair mortar. The patches were of good quality and well bonded, however, the natural color of the repair materials contrasted greatly with the light buff color of the rest of the concrete in place at the station. Lane agreed with the owner, Washington Metropolitan Area Transit Authority, that the patches were unsightly and brought unwanted attention to the repairs. TECVAC, Inc. was summoned for a fix. TECVAC provided a spectrum of samples and WMATA selected the color desired. After removing the previously installed repair material, TECVAC technicians carefully prepared the area and installed the same Sika brand repair mortar, now combined with a proprietary mix of coloring agents and cement. When cured, the patches closely matched the color tone of the member repaired with no compromise of strength. Providing a wide range of grays and tans, PatchMatchtm is more than a one or two patch system. On a Northern Virginia Project, over 5000 patches are now in place. With long term warranties available, objectionable repairs should be a thing of the past when you choose PatchMatchtm for your next repair project. ## For more information telephone toll free 800.847.9324.

TECVAC, Inc. "Taking Quality To A New Level…Worldwide"

39482 Rickard Road Lovettsville, VA 20180 O-703.742.9186 F - 703.742.9231 email - jeremy@tecvacinc.com


Kennedy Gravesite Memorial Pool Receives Tecvac Attention Arlington, VA - Arlington National Cemetery has contacted Tecvac, Inc. to investigate and mitigate leaks in the memorial pool at the gravesite of Robert F. Kennedy. Constructed just after the death of Senator Kennedy, the memorial pool has succumbed to aging deterioration. After many years of leakage, the pool will now be evaluated for the application of Tecvac's exclusive negative force leak repair system. TecSealtm, is a method developed by Tecvac, Inc. to introduce repair materials deep into fractures using negative force induction. Tecvac uses a special expansive repair material that is as thin as water. Then, rather than pushing the material with pressure, the TecSealtm Process pulls the material along and across the plane, deep within the fracture zone. This method totally eliminates pressure pockets and actually mingles the repair resin with the leaking water. It is hopeful this method will eliminate the extremely risky, time consuming and costly alternative procedure of completely removing the granite stones incorporated into the construction of the memorial pool. To learn more about this remarkable process, or to discuss your particular problem, call and speak to a technical representative.

TECVAC, Inc. 39482 Rickard Road Lovettsville, VA 20180 Office 703 742-9186 Fax 703 742-9231 Toll Free 800 847-9324


Leak Repairs and Expansion Joint Assemblies Installed At Washington's Historic Union Station Washington, DC - Tecvac, Inc. has now completed leak repairs and the installation of new TecJointtm expansion assemblies in the parking ramp link structure at Union Station. In connection chronic leakage into the historic train station, Tecvac worked closely with the A/E team of McKissack & Mckissack and McMullan Associates, to bring the water intrusion to a halt. Since the ramp is over 1000 feet long and was not originally designed to be waterproof, this proved to be a formable task. Varying construction details, intense traffic from taxis and heavy bus loads caused significant damage to previously installed expansion joints within a short period of time after installation. Tecvac installed heavy bridge-type joints with it's TecJointtm Process that were designed to withstand intense traffic. Many of the leaks were found to be originating under curbing and sidewalks. The cracks discovered were repaired with Tecvac's exclusive TecSealtm Process of resin injection. TecSealtm, is a method developed by Tecvac, Inc. to introduce repair materials deep into fractures using negative force induction. Tecvac uses a special expansive repair material that is as thin as water. Then, rather than pushing the material with pressure, the TecSealtm Process pulls the material along and across the plane, deep within the fracture zone. Then, the entire area was waterproofed with a tough polyurethane waterproofing membrane and the concrete was re-cast. After numerous rain events, there is not a single leak in the station area below. It was noted by Amtrak personnel that five previous contractors in the past seven years failed to get the area watertight. Tecvac is proud to proclaim that its technicians did. To learn more about this distinguished process, or to discuss your chronic problem, call and speak to a Tecvac technical representative.

TECVAC, Inc. 39482 Rickard Road Lovettsville, VA 20180 Office 703 742-9186 Fax 703 742-9231 Toll Free 800 847-9324


Tecvac, Inc. Awarded Contract To Perform Repairs To Exposed Aggregate Concrete At Historic Meridian Hill Park In Washington, DC Monday, November 4, 2002 Washington, DC ď‚ž Tecvac, Inc. has been awarded the contract to restore historically significant exposed aggregate concrete in the Meridian Hill Park located in Washington, DC. Meridian Hill Park was designed and built by John J. Early beginning in 1913. The walled park served as an experimental laboratory to develop a new medium of concrete construction known as exposed aggregate. When the park was finished in 1936, it consisted of cascading water basins and reflective pool, symmetric stairways and large plaza areas highlighted with intricate pieces of cast art. Over the years, the details that were applied to the cast in place work have deteriorated. Still, the work can only be described as magnificent. One of the methods to be used for restoration is Tecvac, Inc.'s CleanSettm Permeation Injection Process. This is a specialty repair technique developed to structurally restore concrete, masonry and stone without the surface disfiguring, typically resulting from conventional pressure injection. The process has proven a substantial benefit to the repair industry. Epoxy sealing materials have been eliminated and there is no grinding, disfigurement or defacing of the restored member with CleanSettm.

TECVAC, Inc. 39482 Rickard Roade Lovettsville, VA 20180 Office 703 742-9186 Fax 703 742-9231 Toll Free 800 847-9324


VACUUM TECHNOLOGY SUCCESSFULLY APPLIED TO HISTORIC SMITHSONIAN BUILDING

Exposed Aggregate Beam Repair

TecVac, Inc. Has Completed The Difficult Task Of Repairing Fractured Historic Exposed Aggregate Beams At The Hirshhorn Museum of Art.

Washington, DC  A specialty vacuum repair technique has been developed by Washington, DC based TecVac, Inc. to structurally repair historic concrete, masonry and stone. The method, called CleanSettm, has been successfully applied to fractured beams of the Smithsonian Institute’s Hirshhorn Museum of Art. TecVac has introduced repair resin into deep fractures with no tell-tale signs of surface disturbance or disfiguration. The process was installed in cooperation with architrave p.c., architects, the Washington architectural firm ordering the repairs, and eliminated the usual prepatory epoxy sealing materials placed on both sides and a long the crack. The subsequent removal of the epoxy by grinding, normally associated with conventional pressure injection repair methods, has been totally eliminated. The aftermath of the CleanSettm method of repair is a pristine surface with no defacing whatsoever, or any other signs of the repair evident on the adjacent surfaces of the injected fracture. The CleanSettm process now allows the structural restoration of an array of historically significant and aesthetically sensitive applications, including intricate fascias and detailed statues without damage. Precast concrete members, marble panels, masonry or stone materials requiring a conspicuous repair, can now be tastefully completed with CleanSettm.## For more information telephone 703.742.9186 or toll free at 800.847.9324.

TECVAC, Inc. "Taking Quality To A New Level…Worldwide"

39482 Rickard Road Lovettsville, VA 20180 O-703.742.9186 F -703.742.9231 email - jeremy@tecvacinc.com


Social Security Administration Headquarters Cooling Tower To Be Repaired By Tecvac, Inc. Baltimore, MD - Tecvac, Inc. has now completed preliminary inspection of water containment tanks at the Headquarters of the U.S. Social Security Administration and will begin repairs soon. The computers used by the Social Security Administration are cooled by large volumes of water. Because of the catastrophic result from overheating, the mail cooling system has two backup containments. Designed for optimum operation, at least one of the backup systems is to be fully functional at all times. The massive circulation pumps are critical to the operations. A coating was installed to the interior of the containment areas a few years ago. The coating was discovered to be in disrepair when small pieces of the coating were discovered in the pump. Tecvac, Inc. is working closely with the Engineer on the project, McMullan Associates. It is proposed to remove the existing coating, repair leaking cracks with Tecvac’s exclusive TecSealtm Process, properly prepare the surface area by profiling and install a suitable coating that will be fully adhered to the entire containment. With minimal access to the thirty foot deep tanks, it is expected the task will be formidable and labor intense. TecSealtm, is a method developed by Tecvac, Inc. to introduce repair materials deep into fractures using negative force induction. Tecvac uses a special expansive repair material that is as thin as water. Then, rather than pushing the material with pressure, the TecSealtm Process pulls the material along and across the plane, deep within the fracture zone. To learn more about this remarkable process, or to discuss your chronic problem, call and speak to a Tecvac technical representative at 703 742-9186.

TECVAC, Inc. 39482 Rickard Road Lovettsville, VA 20180 Office 703 742-9186 Fax 703 742-9231 Toll Free 800 847-9324 www.tecvacinc.net


TECVAC, INC. RESTORES AND SEALS SAMPLES OF HISTORICALLY SIGNIFICANT STONES FROM THE CZECH REPUBLIC Prague, CZ  TECVAC, Inc. has successfully applied its exclusive PermeNewaltm Permeation Impregnation Process to an assortment of stone types gathered from regions across the Czech Republic. In an effort to protect the country’s multitude of historic treasures from the continual deterioration caused by acid rains and other environmental pollutions, the Czech Technical University commissioned TECVAC, Inc. to perform revival and protection testing on an array of very old monumental stone materials.

Deteriorated 12th Century Sandstone Sculpture

Specimen stones were gathered from around the region and sent to TECVAC, Inc.

More than a dozen different types of stone samples, including a block of nearly disintegrated sandstone were permeated with a specially formulated clear methyl methacrylate repair material using the tm PermeNewal Process. This unique vacuum permeation process produced a marked increase in density and a significant protectant layer was evident to varying depths within the stone’s matrixes. Since the ancient sandstones were in the worst state of deterioration, there was particular delight in the ability of the Permenewaltm Process to deep seal and protect. The sandstone was entirely permeated. Brittle to the touch prior to the PermeNewaltm treatment, after permeation, the sandstone resisted fracturing when hit repeatedly with a wooden mallet. Field applications begin in late 2006. ## For more information telephone toll free 800.847.9324.

TECVAC, Inc. “Taking Quality To A New Level…Worldwide”

39482 Rickard Road Lovettsville, VA 20180 O-703.742.9186 F -703.742.9231 email - jeremy@tecvacinc.com


TECVAC, INC. PARTICIPATING IN LEAK REPAIR INVESTIGATIONS AND REMEDIAL ACTIONS AT WASHINGTON’S UNION STATION

Union Station - Washington, DC

Leaking expansion joints are prime candidate for TecSealtm and TecJointtm

Washington, DC  TECVAC, Inc. has joined the investigative team of Bryant Bryant Williams, P.C./Oudens+Koop Architects, P.C. to investigate and support resolution efforts now being conducted at Washington’s historic Union Station. Leaking expansion joints located in the link structure, connecting the station with the parking garage, have been a chronic problem for Amtrak’s 24 hour operations. Thermal expansions and contractions are great and the joints endure a heavy burden of traffic. Daily in and out travel of tour buses, commuters and taxis pound the joints relentlessly. This around-the-clock passage quickly wreaks havoc on repairs and has been a source of real frustration. TECVAC technicians applied their investigative skills and have successfully identified and temporarily repaired a number of areas of intrusion. To the pleasure of Amtrak, TECVAC has quickly stifled the unwieldy amount of overhead water leakage to a manageable trickle. The investigation is scheduled to conclude in September ’98 when TECVAC, Inc. will implement repairs. ## For more information telephone toll free 800.847.9324.

TECVAC, Inc. "Taking Quality To A New Level…Worldwide"

886 Rhonda Place, SE Leesburg, VA 20175 O-703.742.9186 F -703.742.9231 email - jeremy@tecvacinc.com


Vacuum Technology Report Volume 1 Issue 1

Fall 1997

“ACCURATE INVESTIGATION GUIDES THE PROPER REPAIR”

Topping is rebonded by vacuum

proven to be vacuum injection. A complete and comprehensive condition survey was performed to establish the exact extent of the delamination. Impact-Echo was

W

hen heavy forklift equipment damaged a second story warehouse floor, vacuum technology was there to restore the composite bond with little disruption to tenants. Foremost in the minds of the owner and management company was the disruption necessary to commercial tenants with any form of repair. Initial recommendations were to perform an entire removal and replacement of the topping. A number of concerns pointed to the obvious exposure of the tenants and their businesses below to the freshly placed concrete and the water associated with this form of repair. This operation would necessitate vacating all of the tenant businesses beneath the warehouse to temporary facilities and then, when the repair was complete, moving the tenants back into their spaces. A costly endeavor to say the least but, without some alternative, there was no choice since the ceilings above would occasionally deposit concrete chunks on desks and equipment below. A more accommodating and reasonable method of repair was

Core examination of rebonded topping slab

chosen to detect the void areas. This technology is capable of detecting internal voids, linear cracking, fissures and honeycombing. From a 5’ grid system laid out on the warehouse floor, each shot of the Impact-Echo was recorded. Where delamination was identified, the grid was reduced to 2’ square for more closely spaced readings. The results were recorded and a color depiction of the entire area was presented. The color-coding clearly identified the areas requiring repair. The final report revealed only 68% of the floor was

delaminated and the proprietary repair was begun. The “T” panel supporting panels were not closely constructed. In preparation, spaces between the panels were sealed and backed to retain the repair resins. Each delaminated area was drilled to access the debonded zone and porting devices were mounted to the surface and capped. Vacuum was applied to the delaminated areas and an acrylic polymer (methyl methacrylate) was installed to reestablish composite bond. Upon completion, the entire area was load tested to assure success and future performance. Through a local independent engineer, and working at night, technicians repaired the 35,000sf of defects in just 20 days. Revenue conservation and the quick turn-key repair proved vacuum to render a most prudent choice for repair.

Tecvac, Inc. "Taking Quality To A New Level…Worldwide"

39482 Rickard Road Lovettsville, VA 20180 O- 703 742-9186 F- 703 742-9231 www.tecvacinc.net


Tecvac, Inc.'s TecBondtm Interface Permeation Process Used To Rebond Wall Tiles and Setting Beds To Base Concrete Monday, December 14, 2009 Washington, DC  The TecBondtm Interface Permeation Process is a specialty application technique developed by Washington, DC based TECVAC, Inc. to methodically and efficiently restore composite bond to delaminations in concrete, masonry and stone; and in this case, ceramic fascia tiles and setting beds. The process restores interface bonding of the delaminated materials without the need for any sort of tear out. Where time is always of significant importance, TecBondtm is a bright alternative to conventional removal and replacement. In this instance, the grout lines were sealed in some areas to better accommodate the vacuum. But in the majority of the areas restored, just a small hole was drilled into the grout lines to access the multiple layers of delamination; and in half the time it was taking for the multiple disruptive process required for removal and replacement. TecBondtm is an excellent method to restore composite bond to concrete overlays and topping slabs… and can often be performed with little or no disruption to ongoing operations. Call Jeremy today…he will be happy to discuss your unique situation.

TECVAC, Inc. 39482 Rickard Road Lovettsville, VA 20180 Office 703 742-9186 Fax 703 742-9231 Toll Free 800 847-9324


Topping Slab Is Re-bonded Using TecBondtm Interface Permeation Process Washington, DC - Tecvac, Inc. has re-bonded a four inch topping slab that was delaminated from the structural slab. When the Washington Metropolitan Area Transit Authority was in the final stage of opening its Suitland Station, it discovered that the topping slab, that was soon to receive finish quarry tile, was delaminated. This posed a severe logistical problem and threatened to delay the scheduled opening. Tecvac, Inc. was summoned to offer solutions. Short of removal and replacement of the deficient topping, the only answer was Tecvac's TecBondtm Interface Permeation Process. After hammer sounding the slabs to identify delaminated areas, WMATA selected three areas to perform testing. The TecBondtm Process was performed on the designated areas. Small holes were drilled through the topping slab to intersect the delamination zone. Moisture encountered within the delamination zone was extracted using Tecvac's HotBoxtm Crack Dryer. Effluent air measuring 90% humidity was reduced to less than 7%. Vacuum force was applied to the dry zone and repair resin was introduced. Independent core testing concluded that the vacuum process was a success. Each of the extracted cores broke well into the structural slab, which demonstrated that the composite nature of the bond line had been established. Since the station's construction had progressed to the point where the structure was now an island, replacement of the topping would have entailed complicated scheduling and mobilizations. Some 4,500 square feet of delamination was repaired at substantial savings to the Authority. Tecvac, Inc. is a supplier of high quality advanced technology services to the concrete, masonry and stone repair industries. For more information contact Jeremy at 703.742.9186 or toll free at 800.847.9324.

TECVAC, Inc. 39482 Rickard Road Lovettsville, VA 20180 Office 703 742-9186 Fax 703 742-9231 Toll Free 800 847-9324 www.tecvacinc.net



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