Concrete Contractor June/July 2018

The Decorative Concrete Council Turns Twenty

42 June/July 2018

THE LEADING TRADE MAGAZINE IN THE CONCRETE INDUSTRY

Concrete Foundations Association’s GRAND PROJECT OF THE YEAR

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20

Building the WANDA VISTA 24

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WHAT’S INSIDE

June/July 2018 | Issue 4, Volume 18

Cover Photo Credit: Joe Nasvik

Departments 4 Editor’s Letter 6 Legal Matters 8 New Products 66 The Last Placement

What’s Online QUIKRETE Shotcrete Helps Give Historic Bridge New Life

Cover Story 24 Building the Wanda Vista Placing and finishing one floor every day.

Features 14 Placing Concrete Smarter Maximizing production goals and delivering a quality slab everyday is tough but doable.

20 Driving Toward Craftsmanship is Responding to Your Customer’s Challenge Featured in this article is the Concrete Foundations Association’s Grand Project of the Year.

38 Creating the Perfect Floor Beautiful, high-performance concrete floors start long before the coating is applied.

42 The Decorative Concrete Council Turns Twenty The Decorative Concrete Council (DCC) functions as an integral part of the ASCC concrete contractor membership but focuses on the specific interests for those involved in the production and installation of decorative concrete.

46 Wm. Winkler Speeds Curb and Gutter Work and Site Positioning by 25% 100-year old concrete and civil construction contractor drives productivity on every job by performing stakeout and site measurements without surveyors, using 3D models.

52 Protect your Concrete from Heavy Rains and Extreme Temperatures Strategies for mitigating issues that even slightly inclement weather can bring when placing concrete.

Award-Winning rehabilitation gets custom treatment with color and corrosion inhibitor.

Search: 21007476

Custom Minnich Drill Reduces Concrete Contractor’s Drilling Time from Minutes to Seconds ‘Instead of spending one to two minutes drilling a hole with the old method, I’m able to drill three holes at the same time in a matter of seven to 10 seconds.’

Search: 20999312

54 Equipment Specification Guides: Walk-Behind Concrete Saws A compilation of technical information when choosing your next Walk-Behind Concrete Saw.

56 Updated ASTM F2170 Reflects the Newest Science About RH Testing For years now, the in situ relative humidity (RH) test for measuring the moisture condition of concrete has been shown to be the most reliable, accurate test available.

www.forconstructionpros.com/concrete | June/July 2018 | Concrete Contractor 3

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EDITOR’S LETTER Published by AC Business Media Inc.

A Summer to

CELEBRATE

S

ummer is in full swing and with summer comes backyard BBQ’s, 4th of July celebrations and the lazy days of summer. It’s a great time of the year. In this, the June/July issue of Concrete Contractor there is lots to celebrate as well.

Our Cover Story represents the latest in engineering and construction technology as contractors continue to build the Wanda Vista Tower in Chicago. When completed, it will be Chicago’s third tallest building behind Willis Tower at 1,450 feet.

Turn to page 28 to learn more.

This issue also features the Concrete Foundations Association Grand Project of the year. As voted

by CFA members, the Grand Project of the Year winning project features concrete walls that exceed 20 feet with only a third of the total wall length under 11 feet. To see this project, turn to page 20.

The 2018 slate of Project Award winners that will be announced officially during Concrete Foundations Convention being held at Zermatt Resort in Midway, Utah, July 19-21. Visit for www.cfawalls.org for more information.

Finally, we at Concrete Contractor magazine have some things celebrate as well. Over the years, our publication has covered topics you the concrete contractor want to know about. In Facebook.com/ ConcreteContractor

Advisory Board

Ryan Olson, Publisher/ Editorial Director ROlson@ ACBusinessMedia.com (800) 538-5544

each issue, our readers benefit from information on concrete equipment, current technology, job-site solutions, and best practices in flatwork/slabs, foundations and walls, decorative concrete and polished concrete.

It’s because of you, our loyal readers and advertising partners that have pushed Concrete Contractor to claim No. 1 market share amongst the B2B concrete-related publications. We want to continue to grow in the future, and we want you to be a part of it. If there is a topic you would like to see covered in a future issue of Concrete Contractor, please send me an email at ROlson@ ACBusinessMedia.com.

UPCOMING EVENTS: Solomon Colors 2018 Decorative Concrete Fair – August 21-23. Visit www.brickformtraining.com/eventslist/ for more information.

American Society of Concrete Contractors Annual Conference – September 20-23. Visit www.ascconline. org for more information.

Follow us @ Concreteinsider

Kim Basham KB Engineering Cheyenne, Wyo.

Jim Cuviello Cuviello Concrete Polished|Stained|Crafted Stevensville, Md.

Jim Baty Concrete Foundations Association Mt. Vernon, Iowa

Chris Klemaske T.B. Penick & Sons, Inc. San Diego, Calif.

Search: Concrete Polishing

Dennis Purinton Purinton Builders, Inc. East Granby, Conn.

Joe Reardon Diamatic Orlando, Fla.

4 Concrete Contractor | June/July 2018 | www.forconstructionpros.com/concrete

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201 N. Main Street, Fort Atkinson, WI 53538 (800) 538-5544 • www.ACBusinessMedia.com

www.ForConstructionPros.com/Concrete PUBLICATION STAFF

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Contributing Writers Senior Production Manager Art Director Audience Development Director Audience Development Manager

Ryan Olson, (800) 538-5544, ext. 1306 rolson@ACBusinessMedia.com Kim Basham, Jim Baty, Brad Humphrey, David C. Whitlock, Joe Nasvik, Chad White Cindy Rusch April Van Etten Wendy Chady Angela Franks

ADVERTISING SALES (800) 538-5544

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FORCONSTRUCTIONPROS.COM

Digital Operations Manager

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Editor

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Nick Raether nraether@ACBusinessMedia.com Monique Terrazas mterrazas@ACBusinessMedia.com Larry Stewart lstewart@ACBusinessMedia.com Kimberly Hegeman khegeman@ACBusinessMedia.com

CHANGE OF ADDRESS & SUBSCRIPTIONS

PO Box 3605, Northbrook, IL 60065-3605, Phone: (877) 201-3915 Fax: (847) 291-4816 • circ.ConcreteContractor@omeda.com REPRINTS Ryan Olson, (800) 538-5544, ext. 1306 , rolson@ACBusinessMedia.com LIST RENTAL Jeff Moriarty, SVP, Business & Media Solutions Infogroup, Phone: (518) 339-4511 Email: jeff.moriarty@infogroup.com AC BUSINESS MEDIA INC.

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Published and copyrighted 2018 by AC Business Media, Inc. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording or any information storage or retrieval system, without written permission from the publisher.

CONCRETE CONTRACTOR (USPS 021-799, ISSN 1935-1887 (print); ISSN 2471-2302 (online) is published 7 times a year: January, February/March, April/May, June/July, August/September, October/November and December by AC Business Media Inc., 201 N. Main Street, Fort Atkinson, WI 53538. Printed in the U.S.A. Periodicals postage paid at Fort Atkinson, WI, and additional entry offices. POSTMASTER: Send address changes to Concrete Contractor, PO Box 3605 Northbrook, IL 60065-3605 June/July 2018, Issue 4, Volume 18 One year subscription to non-qualified individuals: U.S. 1 year: $35, 2 years: $70. Canada & Mexico 1 year: $60, 2 years: $105. All other countries 1 year: $85, 2 years: $160 (payable in U.S. funds drawn on U.S. banks). Single copies available (prepaid only) $10.00 each (U.S., Canada & Mexico), $15.00 each (International).

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Printed in the U.S.A.

Concrete Contractor is the Official Media Sponsor of the CFA Foundation Company Certification Program

®

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When high-performance fibers can strengthen concrete while eliminating steel reinforcement… …that’s Chemistry At Work.

MasterFiber® high performance products are an advanced concrete reinforcement solution to traditional steel resulting in enhanced crack control, prolonged structure service life and excellent concrete finishability. MasterFiber products improve safety and reduce overall costs associated with steel reinforcement. Convert with Confidence to MasterFiber products from BASF. For more information, visit:

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ForConstructionPros.com/10075618 Master Builders Solutions is a registered trademark of BASF. © 2018 BASF Corporation. All rights reserved.

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LEGAL MATTERS

Marijuana Use at Work As more and more states enact laws that decriminalize, and in some cases, legalize marijuana use, how does a contractor maintain a drug-free workplace? oncrete contractors are increasingly frustrated by so-called marijuana reform legislation.

Approximately 20 states now protect medical marijuana use to some extent. Half a dozen states now permit recreational marijuana use. Yet, marijuana remains a controlled substance illegal under federal law.

One contractor recently raised the following questions: How do business owners maintain a zerotolerance policy on drug and alcohol use? How can concrete contractors maintain a drug-free workplace if their ability to conduct pre-employment and random drug testing is compromised by state legislation? What steps are contractors taking in states that have legalized recreational marijuana to find drug free employees? How do concrete contractors avoid wrongful termination litigation?

prohibit impairment on the job. This means that concrete contractors can drug test on a pre-employment and random basis and refuse to hire or terminate someone who is impaired by recreational marijuana use. This will likely continue to be the case so long as the federal government continues its current stand making marijuana a controlled substance with limited medical value. So, as a practical matter, concrete contractors should continue pre-employment and random drug testing.

One problem that may arise is determining “impairment.” Here, concrete contractors should work closely with their occupational medicine clinic. If at all possible, contractors should not make an “impairment” determination on their own, but instead should rely upon an evaluation by a medical professional.

This is also important because impairment and drug testing results do not correlate well. In other words, an individual may test positive for marijuana use days or even weeks after impairment. This makes it all the more critical for concrete contractors to rely upon the independent “impairment” determination of a qualified medical professional. Note that this is only necessary in states that have legalized use of marijuana.

In other states, concrete contractors can rely upon the drug testing results and make the decision not to hire or to terminate the individual.

RECREATIONAL USE

MEDICAL USE

First, let’s break the issue down into two different components: recreational use versus medical use. So far, no state court system has refused to acknowledge an employer’s right to

In states that have sanctioned medical use of marijuana, the situation is slightly different. In most cases, the individual will indicate before testing that he or she is a

C

David C. Whitlock has over 25 year’s experience in business immigration, compliance, employment counseling and training. He is the founding attorney of Whitlock Law LLC and can be reached at (404) 626-7011 or at davidcwhitlock@gmail.com.

medical marijuana user, and usually will present a medical card issued by the state of documentation from a physician. Last summer, a Massachusetts court held that an employee who acknowledged medical use of marijuana and was terminated for a positive drug test could state a claim for disability discrimination. In essence, the court said that the employer must go through the disability claim process, using the reasonable accommodation analysis, before taking final action.

As part of the reasonable accommodation analysis, the employer may claim that the accommodation the individual seeks would impose an undue burden.

A medical professional may be the concrete contractor’s best defense against a wrongful termination claim. The defense is strengthened if the medical professional understands and takes into consideration the performance impairment issue, but also if the medical professional understands the safety risk created by continued employment.

The bottom line for concrete contractors is know your state law.

Again, make certain to work closely with a medical professional who is well aware of the individual’s job and safety factors. In states that have also legalized recreational use, work closely with the medical professional to obtain an independent impairment determination.

Of course, none of this guarantees drug free workers, but at least it will be safer to refuse to hire or terminate impaired workers and avoid wrongful termination lawsuits even in states that are legalizing marijuana use.

6 Concrete Contractor | June/July 2018 | www.forconstructionpros.com/concrete

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Long-Lasting Concrete Pavement Repair

TechCrete™ Uniquely formulated hot-applied, gray-colored, polymer modified resin based flexible concrete repair material used to repair cracks, spalls, pop-outs, potholes, failed joints, and most types of defects in concrete surfaces up to 8” deep HP Concrete Cold Patch™ Uniquely formulated cold-applied, gray colored, single component, specially designed thermoplastic binder and unique aggregate patching material used to repair cracks, spalls, potholes, and other confined voids >1” wide and 1/2” deep RoadSaver™ Silicone Sealant Uniquely formulated low modulus silicone for sealing joints in Portland Cement and Asphalt Cement supplied in a ready to use single component moisture curing system providing a longlasting, flexible seal To extend pavement life and save money contact us: sales@crafco.com crafco.com 800.528.8242 ForConstructionPros.com/10072573 ForConstructionPros.com/XXXXXXX

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NEW PRODUCTS

New Products ››››› A compliation of the latest products to the concrete industry.

Concrete Pump Supply One Bolt Clamp

Transhield Introduces TopCure Cover

Toro Plate Compactors

Toro’s new plate compactors are designed with a patented base geometry and optimal eccentric placement, amplitude and VPMs. New reversible plate compactors offer a centrifugal force range from 4,950 lb. to 14,160 lb. and feature hydraulic travel control with a safety valve to offer overload protection.

• Patented offset eccentric sheave eliminates belt stress • One-piece base plate includes a large oil reservoir • Patented sprinkler prevents asphalt sticking and reduce dust • FP-2200: 13-in. x 21-in. plate, 2,200 lb. eccentric force, 6,100 vpm, 140 lb.

• FP-3000: 20-in. x 24-in. plate, 3,000 lb. eccentric force, 6,000 vpm, 205 lb.

• FP-4000: 20-in. x 24-in. plate, 4,000 lb. eccentric force, 5,200 vpm, 215 lb.

ForConstructionPros.com/10879925

Transhield, long known for their advanced protective cover technology, introduces TopCure – a high-quality, state-of-the-art concrete curing cover that provides a controlled environment for slab-on-grade curing.

• The grit surface provides an anti-skid surface to keep workers from accidental slips and falls – lowering the risk of injury at the worksite.

• Transhield’s proprietary reflective white coating (as used in our base materials) reflects sunlight which helps control the temperature under the cover • Hydrating pods allow faster water absorption in the nonwoven material and concrete surface area • Our advanced method of manufacturing our film creates higher strength and better physical properties compared to equal weight film ForConstructionPros.com/21007237

Concrete Pump Supply is proud to present our new one of a kind Heavy Duty One Bolt Clamp. This clamp is designed to replace heavy duty two bolt clamps for high pressure jobs, specifically high rise placing line set ups. The hinged design of this clamp allows less time for setup and breakdown of a pipeline than that of a traditional two bolt clamp.

ForConstructionPros.com/20991207

Kingdom Products’ Imperial Waterproofer

Imperial Waterproofer is a highperformance, brushable, cement-based coating for concrete and masonry surfaces that forms a waterproof barrier to seal out dampness and water seepage. It is resistant to lower levels of hydrostatic pressure and will prevent radon gas & moisture vapor intrusion. Imperial Waterproofer, designed for vertical use only, can be applied interior or exterior and can be used above or below grade. Use on foundations, retaining walls or as a damp proof course between brick and block.

ForConstructionPros.com/20991213

QUIKRETE Advanced Polymer Sealant Adhesives

A solvent and isocyanate free line of high-performance, commercial-grade flexible repair and bonding materials, QUIKRETE Advanced Polymer Adhesives meet ASTM C920 standards. Designed to deliver or exceed the performance of traditional polyurethane or silicone sealants and adhesives, the single-component QUIKRETE Advanced Polymer Adhesives are environmentally-friendly alternatives. Available in 10-ounce tubes, applied with a high-quality caulk gun.

• Self-Leveling Sealant – permanently seals horizontal cracks and expansion joints in concrete with smooth, level, tack-free finish in 20 minutes.

• Mortar Joint Sealant – permanently seals and waterproofs mortar joints with textured matte, tack-free finish in 20 minutes.

• Concrete Crack Sealant – permanently seals and waterproofs cracks in concrete with textured matte, tack-free finish in 20 minutes.

• Construction Adhesive – permanently bonds concrete, masonry, brick, veneer stone, foamboard, drywall, wood and plastic ForConstructionPros.com/20991102

8 Concrete Contractor | June/July 2018 | www.forconstructionpros.com/concrete

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New Q-Max Pro Concrete Mix is the first and only concrete mix to deliver one-hour working time, three-hour walk-on time, and 6500 PSI compressive strength. With superior workability plus crack resistance, freeze-thaw durability, and corrosion resistance. Quikrete.com.

What america’s made Of. Ž

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NEW PRODUCTS Trimble Connect for HoloLens

Trimble Connect for HoloLens is a mixed-reality solution that improves coordination by combining models from multiple stakeholders such as structural, mechanical and electrical trade partners. It provides for precise alignment of holographic data on a 1:1 scale on the jobsite, to review models in the context of the physical environment. Predefined views from Trimble Connect further simplify in-field use with quick and easy access to immersive visualizations of 3D data. Users can leverage mixed reality for training purposes and to compare plans against work completed. Advanced visualization further enables users to view assigned tasks and capture data.

The Hard Hat Solution for Microsoft HoloLens extends the benefits into areas where increased safety requirements are mandated. The ANSI-approved solution integrates the HoloLens holographic computer with an industry-standard hard hat, and enables optimal placement for viewing 3D data in field applications. MSA V-Gard hard hat, suspension system and quickrelease accessory clips included.

ForConstructionPros.com/21004477

695XL Gas-Powered Concrete & Utility Pipe Chain Power Cutter

Wagman Metal Products Metal Tooling for GHP

New metal tooling with grit levels 40, 70, and 150 have been added to the Wagman Revolution GHP System. Wagman Metal Products Inc., a manufacturer of power trowel replacement blades, pans and innovative trowel attachments for scrubbing, stripping, and polishing, introduces new metal diamond tooling.

• The metal tooling allows for faster and more economical removal .

• The durable metal bond is aggressive while lasting much longer than the hybrid tooling.

• The 40 metals will help process to the medium to large aggregates while the 150 metals will stay more in the cream.

• The metal tooling can be used on 36” and 46” walk-behinds as well as 6’ and 8’ ride-on power trowels.

• The 11” size can be used on the Wagman LP230.

ForConstructionPros.com/20999141

The 695XL from ICS features include an easy to start engine with higher energy ignition system and durable, long-lasting components including a new muffler, carburetor and piston and cylinder. Available with 12-inch (30 cm) 14-inch (35cm) and 16-inch (40cm) guide bars and the entire line of MAX, ProForce and PowerGrit series diamond chains.

The 695XL is the highest horsepower ICS gas power cutter for frequent-use by general construction, utility contractors and concrete professionals.

ForConstructionPros.com/21007375

Vanguard Small Block V-Twin EFI Engines

The horizontal-shaft Small Block V-Twin engine features an open-loop electronic fuel injection system with electronic governing engineered for the demands of commercial construction.

• EFI now available on four engine platforms across nine horsepower ratings varying in output from 23 to 37 gross hp at 3,600 rpm • Preprogrammed to deliver fuel based on operator throttle • Electronic governing system optimizes usable power, provides more responsive and efficient delivery and improves shock load acceptance and speed control ForConstructionPros.com/20997533

Runyon Magnetic Preload System (MPS)

The Runyon Magnetic Preload System (MPS) is an innovative tool holding system for power trowels, auto scrubbers and swing machines. Runyon MPS allows for the fast and efficient changing of any 3" velcro-backed tooling on a standard 14" or 16" pad driver.

The system consists of a stainless steel ring that bolts to the pad driver and high density polymer tool holder rings with embedded magnets on one side and six recessed slots for 3" velcro-backed puck style tools on the other.

Runyon Surface Prep Rental & Supply also carries slurry management supplies, trowel machines and parts, and tooling in conjunction with the magnetic preload.

ForConstructionPros.com/21004677

Husqvarna K770 Power Cutter

The K 770 has a high power-to-weight ratio design, meaning increased exactness and force of the cut, while the low weight and vibration-damped chassis ensure comfortable handling during long, productive work shifts. The spring-loaded, semi-automatic SmartTension technology makes it easy to ensure the drive belt is always kept in the correct tension for optimal power transmission and maximum belt life. The heavy-duty cutting arm with three-bolt joint maximizes longevity and durability in all conditions. The unit has a 5-hp engine and a displacement of 4.48 cu. in. It can handle blade diameters of 12 and 14 in. and provides a maximum cutting depth of 4 to 5 in. depending on blade size.

Video: https://bit.ly/2IqxLWn ForConstructionPros.com/21003358

10 Concrete Contractor | June/July 2018 | www.forconstructionpros.com/concrete

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ForConstructionPros.com/10074314

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NEW PRODUCTS Milwaukee Introduces OSHA Table 1 Compliant Dust Box

AquaJet Aqua Spine

The Aqua Spine uses high-pressure water jets to precisely remove concrete from surfaces that may have been previously inaccessible.

• Multi-modular system includes a single feed beam to ensure adaptability to different applications • Comes with dual and triple interchangeable rail systems and adjusts from 3 to 19 ft.

• Length and width changed seamlessly by adding or removing spine beam sections • Standard setup with triple spine in max configuration can remove about 194 sq. ft. of concrete before needing to be moved • Controlled via an Aqua Cutter robot or standard Power Control Unit ForConstructionPros.com/20992965

Milwaukee Tool is excited to build upon its current M12 Universal HAMMERVAC Dust Extractor and M18 Dedicated HAMMERVAC designs with an updated dust box. Both HAMMERVAC units utilize a replaceable HEPA filter for efficient debris filtration. An updated dust box will allow users to easily clean the filter with the press of a button, making these tools Occupational Safety and Health Administration (OSHA) compliant solutions through Table 1 Requirements.

Per HEPA standards, the certified HEPA filter removes 99.97% of particles greater than 0.3 µm. However, the M12 Universal HAMMERVAC and M18 Dedicated HAMMERVAC feature unique replaceable filters so users can replace the filter independently of the dust box to cost-effectively maintain suction efficiency. By pressing a button twice on the side of the unit this filter cleans itself every time users empty the dust box.

ForConstructionPros.com/21007222

PERI Formwork Systems ALPHA Prop Series The new Alpha Prop series steel props have been optimized to offer a strong, versatile, easy to use steel prop at a great price point.

Like the higher end PEP & PEP ERGO props, the Alpha props are also equipped with the G-hook pinning connection at the inner tube for quick height adjustment. Fine adjustments are done by turning the nut on the outer tube. The Alpha series props are not available for rental, purchase only.

Alpha B-300 • Extension up to ~9'-10" • Weight 34 lbs • Load capacity up to 6.7 kips

Alpha B-350

Cementometer from James Instrumments

The Cementometer utilizes the latest microwave and microprocessor science and to determine the moisture content of freshly mixed cement, concrete, and mortar. Simply insert the prongs of the probe into the material to be measured and instantaneously the water cement ratio is shown on the easy to read display.

Two units are available to encompass the full range of water cement ratio's found in wet concrete.

• The Cementometer Type R handles normal water cement ratio's with its two prong probe.The range of this instrument is approximately 0.35 to 0.65 water/cement.

• Cementometer Type L handles low water/cement ratio's with its five prong probe. The range of this instrument is approximately 0.2 - 0.4 water cements.

ForConstructionPros.com/21007240

• Extension up to ~11'-6" • Weight 39 lbs • Load capacity up to 6.7 kips • Comes in bundles of 50 props.

ForConstructionPros.com/21006464

HTC expands DURATIQ Line with DURATIQ 5

HTC – innovator in floor grinding – is now adding an entirely new DURATIQ 5 to its award-winning DURATIQ line of grinders.

The DURATIQ 5 has a grinding width of 20 in. (515 mm) and is available in two models – one with a motor rated at 3 hp (2.2 kW) and the other at 5 hp (4.0 kW).

Both models have an entirely new design with the focus on ease of handling and power, which are key factors in this popular machine segment. At the same time, the DURATIQ 5 boasts features that are unique for its size. The DURATIQ 5 models will replace the ever-reliable HTC 420 and HTC 500.

Below are just some of the 75 new features on the DURATIQ 5: • Digital control panel provides full control of the DURATIQ 5’s capacity and functions, unmatched by any other grinder of this size ForConstructionPros. com/21003373

Vexcon Announces New Penetrating Water Repellent Seal & Cure

STARSEAL GUARD DC is a water base innovative one step product that combines the benefits of a penetrating water repellent sealer and a dissipating white curing compound for fresh concrete into one product. The product, which meets ASTM C-309 curing requirements and the Chloride Ion Penetration requirements of NCHRP 244 forms a temporary film that restricts moisture loss allowing concrete to reach maximum strength and durability. When the curing compound wears off, the concrete remains protected from the harmful affects of freeze thaw cycles, salts and deicer chemicals that can result in costly damage to concrete.This innovative onestep product eliminates the costly removal of curing compounds and time consuming water curing of fresh concrete when a protective penetrating water repellent sealer is desired.

Once applied, the surface is properly cured and water repellent in one application and puts concrete into service weeks sooner.

ForConstructionPros.com/21007431

12 Concrete Contractor | June/July 2018 | www.forconstructionpros.com/concrete

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BLAST-OFF

GREEN ENGINEERED TM

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FLATWORK/ SLABS

By Chad S. White

Figure 1: Large slab on grade placement utilizing truck dump and laser screed strike-off.

Photo Credit: Chad S. White

Placing Concrete

SMARTER

Maximizing production goals and delivering a quality slab everyday is tough but doable.

It involves upfront planning, agreed upon means and methods and goals that are realistic for site, environmental conditions and placement constraints.

Y

ou need to understand your capabilities and the realities of the placement. You should be able to

predict success goals based on site access, batch plant capabilities, strike-off methods, mix design and finishing characteristics. Sounds simple doesn’t it? I have had the opportunity through a long career in the concrete industry to participate or observe many slab placements and I’ve seen most anything that can go wrong, go wrong. The wheels usually start coming off when the unexpected happens and improvisation starts on the fly.

FACTORS AFFECTING PLACEMENT RATES AND PRODUCTIVITY Placement layout and access is one of the first things that need to be evaluated and established. Layout needs to compliment end use of the floor, placing methods (truck dump, pump, conveyor), strike-off equipment and access to the point of placement. Travel routes and staging areas for concrete trucks and

equipment must Figure 2: Slab on be defined along grade placement with concrete ready for wash-out area. I concrete. was on a project a Photo Credit: Chad S. White while back where the placements were laid out transverse to the dock areas to facilitate larger placements which resulted in construction joints running across all the aisles. Schedule and ease of placement were the driving factors for installing slabs with joints that could be problematic for

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FLATWORK/ SLABS

Figure 3: Placing concrete utilizing a concrete pump and downline.

Photo Credit: Chad S. White

the final end user of the facility. Travel routes and access were great but was the best product being provided?

Aligning the placements to minimize construction joints across the aisles probably would of added a day or two to the schedule.

Pre-placement checklist and sign-off is critical to insuring that slab prep-work and sub-base are ready for concrete. Everybody knows this so why doesn’t it happen?

Team discipline and complacency is usually the primary culprit. It requires effort to physically inspect the area, review specifications, gather all the pertinent parties and verify preparations are complete. Often times the responsibility is left to someone who may not be the most qualified because the senior field management personnel feel they don’t have the time to deal with it. Many of the issues that impact concrete placements on a daily basis could be eliminated. Sub-base rutting, forms moving, floor penetrations not at correct elevation, reinforcement not chaired correctly, saw cut layout wrong, walls and columns not wrapped or protected, sound familiar?

Concrete service and place/finish crew capabilities will primarily determine the size and duration of the placement. The goal is matching concrete service rates and crew placing ability so that a predictable, consistent rate of placement is achieved.

Different projects will have different objectives but a good rule of thumb is a six to eight hour window for placing Figure 4: Establishing wet screed elevation and strike-off.

Photo Credit: Chad S. White

concrete. A shorter placing window is sometimes advisable if the overall place, finish and cure duration is critical, although utilization of placing personnel after placement may not be efficient. Longer durations for placing concrete can lead to inconsistent set times and worker fatigue.

I’ve heard all the bragging about how fast concrete can be put on the ground, but day in and day out these averages seem to hold true over millions of square feet I have seen installed: Truck dumping and laser screed strike-off placing rates vary from 80-160 cubic yards per hour determined by batch plant capabilities, access and screed capabilities. I have seen placing rates of 200 yards per hour but rarely for an entire placement.

Remember that the start and stop of the placement always go a little bit slower.

Pumping rates will be dependent on reach, amount of system involved and number of relocations required. Placing crew experience is a key factor also. Pumping directly out of the boom with a minimum of relocations usually results in production rates of 60-100 cubic yards per hour. If a downline must be used, production rates will drop to 40-60 cubic yards an hour.

Wet screeding of concrete is the least accurate and most labor intensive method of placing concrete but sometimes it is the only option available. Crew skill level is paramount to maximizing production rates. Pipe screeds, rails and mechanical wet screeds can alleviate some of the skill issues. Placing rates for wet screeding will vary

16 Concrete Contractor | June/July 2018 | www.forconstructionpros.com/concrete

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FLATWORK/ SLABS Figure 5: Test placements will confirm proposed means and methods and mix design characteristics.

Photo Credit: Chad S. White

is historical data on the mix design and installing a test placement or mock-up panel. Prime considerations should be ease of placement, loadto-load uniformity and set time. A well designed slab mix should finish 4-8 hours after being placed dependent on weather conditions.

widely but figuring 30-60 cubic yards an hour is probably realistic.

Ambient weather conditions and weather protection typically impact finishing more than placing but must be game planned for from start to stop. Accepted and job specific cold weather and hot weather practices should be throughly understood by all key personnel. Placing 6 to 7-in. slump concrete may be the fastest way to get concrete on the ground, but during cold or cool weather conditions those advantages will be offset by longer finish times.

Hot weather conditions often time require additional manpower due to faster set times and the toll that hot weather takes on the workers.

You can’t control the weather but short term forecasts are generally accurate and conditions can be managed. First things first; take care of your workers, hydration, bathroom facilities and break areas close to placement improve morale and individual productivity. Concrete set times can be adjusted to the weather conditions in numerous ways such as modifying concrete temperature, using accelerator or retarding

admixtures, adjusting placing slump and evaporation retardants. Placing at night or off-hours can often make it easier on the concrete supplier and during hot weather makes a lot of sense.

Mix design set characteristics and finishability should be known prior to start of placement. The easiest way to get this information

Placing concrete smarter pays off in safety, quality and productivity gains. Having a defined work plan coupled with shorter place/ finish durations reduces worker fatigue which is a major factor in accidents that happen in the construction industry. Rework is reduced when crews become involved with standardizing means and methods according to best practices. Accountability promotes teamwork and communication.

Quality will improve and job costs will be lowered when all factors that affect a daily concrete placement are routinely considered and managed.

Figure 6: Profilograph being used to measure F-Min numbers.

Photo Credit: Chad S. White

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HOW TO GET SMARTER Promote and implement “Best Practices” within your organization.

These are things that you do the same every time, every placement and have been proven to be successful. Define and standardize means and methods for various placement scenarios. What doesn’t get measured seldom gets improved.

What are the internal yardsticks that you measure your crew by?

Often times FF/FL numbers drive the entire quality program to the detriment of other factors that go into a quality floor just because it is the easiest thing to measure. How do you quantify slump discipline, joint construction, finish and other critical factors that go into a quality floor?

Drive the schedule. Realistic schedules that reflect capabilities, site conditions and logistics won’t come from the guys in the office.

There must be input from the field crews. Try to minimize compromising placement quality and crew productivity due to schedule constraints.

Planning and communication.

Plan your work, work your plan but understand that plans change especially when you consider how fluid construction activities can be. Try to eliminate or minimize the variables that can affect your concrete placement. The closer you can make it to factory conditions the more predicable the results.

Pre-placement meetings, test placements, worker huddles, and post placement reviews are all important. Communicate Scope of Work, pertinent specifications and details and production goals to all crew members.

Training and education of your workforce is the key differential between concrete contractors. Stop

and think for a minute about your competitors and leaders within our industry. What makes them better?

The latest advances in technology and equipment are practiced and used across the industry. It’s the people within your organization that make the difference. Develop a culture of continuing education and training from top to bottom.

ACI certification, World of Concrete seminars and trade schools are just some of the options available.

Lessons learned is a big part of your institutional data base and compliments development of your Best Practices. I would recommend crew enhancement training that is available on the jobsite, it is a great way to get information to everyone on the crew and upgrade skill sets.

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FOUNDATION & WALLS

By James R. Baty II

Driving Toward Craftsmanship is Responding to Your Customer’s

CHALLENGE

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This project pulled the team of SCW into delivering architectural concrete that not only provides the structure for the home but also becomes part of the visual aesthetic, the skin and nuances of what many home owners today look for from their home.

Photo Credit: Concrete Foundations Association, Project of the Year Competition, as submitted by SCW Footings & Foundations, Inc.

Featured in this article is the Concrete Foundations Association’s Grand Project of the Year, one of the many projects receiving recognition in the Association’s 2018 Projects of the Year competition.

L

udwig Mies van der Rohe, renowned architect and one of the strongest influencer’s of the modernism movement in architecture was once quoted as saying, “Reinforced concrete buildings are by nature skeletal buildings. No noodles nor armoured turrets. A construction of girders that carry the weight, and walls that carry no weight. That is to say, buildings consisting of skin and bones.” In this quote, one finds the relationship of a project, particularly one of concrete, compared to the very physical and familiar nature of the human body. In many ways, this quote gives insight to the way contractors experience each and every work they eventually turn over to another or pull back from to allow completion and ownership to transcend their creative energies, in other words, the molding is done.

In the Spring of 2017, SCW Footings & Foundations of Salt Lake City, Utah completed construction on a project presenting quite unusual qualities when compared to the traditional foundations experienced across the landscape of both the CFA’s award programs and that of the traditional projects noted as single-family residential foundations.

In relation to the quote from Mies, where most concrete foundations establish a base for the architecture, this project pulled the team of SCW

into delivering architectural concrete that not only provides the structure for the home but also becomes part of the visual aesthetic, the skin and nuances of what many home owners today look for from their home.

The project itself is not the ostentatious presentation of sheer size, volume and extreme contracting conditions that has been the moniker of this award program in years past.

At just over 4,500 square feet (420 sq.m.) the project was sized among the more benign projects typically undertaken in the mountains and valleys of the lower Rockies. Yet, one is quick to take notice of this project after looking past the basic statistics.

It features concrete walls that exceed 20 feet (6 m) with only a third of the total wall length under 11 feet (3.4 m).

These tall walls display a decorative concrete feature down the center of the floor plan that anchors the foundation and the house itself into the landscape.

Submitting the project for the program, Dave Sheppard, project manager and estimator for SCW had this to say, “There aren’t many homes under 5,000 square feet that have these types of walls. Most noticeably, the feature that is a decorative concrete wall system down the middle of the home poured 20’-6” (6.25 m) at its tallest point, spans over 70 feet (21.3 m) from front to back."

A few unique and very intricate details are described by the SCW team occurring specifically in this wall of which they are most proud.

“The 4’x8’ (1.2m x 2.4m) smooth ply finish panels were showcased across all exposed faces of the wall,” states Sheppard. “These were outlined with chamfer strips and detailed with 18 faux cone tie holes in each panel.

Overall, the finish covered nearly 1,600 square feet of wall.”

Companies that traditionally use manufactured handset forms for castin-place concrete foundations find a strong learning curve when they are given the challenge of producing a more contemporary, exposed concrete aesthetic like the snap-tie cone rhythm of a wall like this. When asked

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FOUNDATION & WALLS The project features concrete walls that exceed 20 feet (6 m) with only a third of the total wall length under 11 feet (3.4 m). These tall walls display a decorative concrete feature down the center of the floor plan that anchors the foundation and the house itself into the landscape.

Photo Credit: Concrete Foundations Association, Project of the Year Competition, as submitted by SCW Footings & Foundations, Inc.

about their approach to this specialized aesthetic, Kirby Justesen, president of SCW Footings & Foundations had this to say, “Although we mostly form with aluminum panels, when we pour decorative concrete walls, whether that is board-form walls or traditional architectural walls with chamfer and cone ties, we use the Symon forming system. Symon forms allow us to more easily attach the boards or liners. Those boards can be wood planks, HDO plywood, or plastic/rubber liners. It just simply takes a lot more time to build and a lot more time to plan.”

In addition to the smooth-ply decorative tie pattern, SCW provided architecturally-detailed concrete throughout the project. Some of these features included nine (9) separate custom-built “bucks”, the rough or in this case finished opening for doors, windows and fireplaces.

Although it may seem that casting high-quality square openings that will be exposed to the home could be relatively straight forward, the SCW quickly notes that not all these were simple squares or rectangles. The three fireplace bucks had exacting tolerances in order to receive the fireplace headers and sills. Each buck

ALL AWARD WINNERS The 2018 slate of Project Award winners that will be announced officially during Concrete Foundations Convention 2018 being held at Zermatt Resort in Midway, Utah, July 19-21 include: • Single Family Residence Under 2,000 sq.ft.

• Single Family Residence 2,000 to 5,000 sq.ft.

• Single Family Residence Over 5,000 sq.ft. (Also Grand Project of the Year) • Commercial Project • Non-Wall Structural Element • Honorable Mention was built to leave a full opening in the wall while the headers and sills were inset only 4 in. (100 mm) into the wall. Justesen is quick to note, “This may seem simple but when you’re dealing with tight corners and depth changes, concrete doesn’t always flow perfectly. Avoiding 'bug holes' and 'honeycombing' was our biggest worry in these small corners.

We had to develop a special concrete mix design that we had practiced and

experimented with in order to avoid these issues. Along with our knowledge of pour timing and vibrating, we were able to achieve nearly flawless corners around these bucks.”

SCW as a company has spent a lot of time experimenting with architectural concrete as the Utah market has been trending toward a greater amount of the expressed concrete aesthetic in housing. “We have conversations with architects and home owners nearly every week asking us if we can achieve a particular look they have found on Pinterest or seen in a magazine. We actually like the challenge and have become accustom to

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experimenting and testing in order to achieve the requested or specified finish,” states Justesen.

SCW was recognized two years ago for another impressive feat of architectural concrete involving the “board formed” appearance that has been very popular in the last ten years or so. The team at SCW is known throughout the region as the company contractors can turn to in order to mold concrete to fit the vision of the designer. Justesen believes it to be their attention to detail and craftsmanship that makes At just over 4,500 square feet (420 sq.m.) the project was sized among the more benign projects typically undertaken in the mountains and valleys of the lower Rockies.

Photo Credit: Concrete Foundations Association, Project of the Year Competition, as submitted by SCW Footings & Foundations, Inc.

the difference. “This contractor was incredibly impressed with our portfolio found on our website www.solidconcretewalls.com) and along with in-person site visits to other jobs we were able to take them. We feel our architectural concrete is unmatched in the residential foundation industry in Utah, and we are fortunate with this opportunity that they agreed.”

But the challenge of a project like this, combining both size and complexity of the concrete work doesn’t come easy. Scheduling, is what Sheppard and Justesen believe to be an essential part of the success.

SCW as a company has spent a lot of time experimenting with architectural concrete as the Utah market has been trending toward a greater amount of the expressed concrete aesthetic in housing.

Photo Credit: Concrete Foundations Association, Project of the Year Competition, as submitted by SCW Footings & Foundations, Inc.

In order to commit to such a project, knowing it will require a crew that has perhaps the most experience and is larger than normal. Whereas the standard residential foundation job is often characterized as a three-day project (given perfect conditions), the team at SCW know going in to this type of a project it will take weeks to complete. “Since projects like this can take weeks to complete and we must be sure other jobs aren’t neglected because of them, we start by dedicating a project manager to the study of the project and pair him with a CAD draftsman in order to draw the details necessary to visualize the project from our perspective,” states Sheppard.

“Architectural and even engineering plan sets just don’t deliver the detail we need,” states Justesen. “Therefore, our team redrafts the picture and details the wall heights, rebar schedules and step locations for our field crew so that they would not be hindered in any way.” This type of effort results in a completely new package of drawings that address each and every detail SCW will encounter on the project. All buck locations, panel sizes and locations and every connection detail are drawn fully to the satisfaction of the project manager before they get to the jobsite.

When asked how the company feels about the achievement of completion on this project and the recognition it now receives from the CFA Projects of the Year, Justesen offered, “These projects are fun to do and scary at the same time. We are always relieved when they turn out good. I love the look of durability and strength that exposed concrete walls have.

When we have the chance to add a little artistry to our work it is enjoyable.

When we receive industry recognition it is just icing on the cake.”

Ed. Note: More photos of this project can be seen in the awards section of the CFA’s website, www. cfawalls.org, where the annual project award recipients are archived.

Want to know more? Contact CFA Executive Director, Jim Baty at 866-232-9255 or by email at jbaty@ cfawalls.org.

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COVER STORY

By Joe Nasvik

Management on the jobsite includes (left to right) Kevin McGrath—Assistant Concrete Superintendent, Rachael Dolecki—Concrete Safety Manager, Pete Vondra—Carpenter General Foreman, Max Levin—Concrete Project Manager, and Kevin Morley—Concrete Superintendent.

Photo Credit: Joe Nasvik

Building the

VISTA TOWER

Placing and finishing one floor every day.

T

he Vista Tower construction includes a low-rise structure and three towers and is located alongside the Chicago River in the heart of downtown Chicago only a couple blocks away from Lake Michigan.

The tallest tower will be 100 stories at 1,190 feet above ground, putting it in the Super-tall Category— defined by the Council on Tall Buildings and Urban Habitat as any building whose height exceeds 984 feet. When finished it will be

Chicago’s third tallest building, behind Willis Tower at 1,450 feet and the Trump Tower at 1,388 feet.

The construction is all structural concrete and represents the latest in engineering and construction technology.

The vision to build Vista Towers began with discussions between Magellan Development and Jeannie Gang at Studio Gang Architecture. Then Ron Klemencic, the CEO of Magnusson Klemenscic Associates (MKA) based in Seattle, Washington was brought in to help make their concept structurally and economically viable. Klemencic involved McHugh Construction and others to bring together the latest

research and technology and up-todate construction practices. These lead companies have worked well together in the past. They include: • The Developer and owner: Magellan Development Group, Chicago, Ill. • Design: Gang Studios, Chicago • Architect of Record, bKL, Chicago • Structural Engineering: Magnusson Klemencic Associates, Seattle/Chicago • General Contractor: James McHugh Construction Company, Chicago

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Caissons under the core structures go down to bedrock, approximately 120 feet below, other caissons on this structure went down approximately 85 feet and had flared bottoms to increase the bearing surface on the hardpan clay. The 10-foot diameter caisson in the lower right has a steel sleeve and is ready for concrete placement.

Photo Credit: Joe Nasvik

As the general contractor McHugh has a long history with highrise building construction, their first one being the iconic 65 floor structural concrete Marina Towers built along the Chicago River in Chicago constructed in 1967. Today high-rise and super-tall building construction accounts for about 60% of their business. David Alexander the company’s president says they have built eight of the twelve tallest concrete buildings in Chicago and five of the ten tallest concrete buildings in the U.S. On this project McHugh is both the general contractor (McHugh GC) and the concrete sub-contractor (McHugh Concrete) which performs all the concrete work, formwork, rebar and post-tension reinforcement, concrete pumping, and the operation of “skip hoists” and tower cranes.

DESIGN The design that Gang Studios settled on uses geometric shapes called “Frustums.,” In geometry, a frustum is the portion of a solid (normally a cone or pyramid) that lies

between two parallel planes cutting through it. For this project, frustums are inverted on top of each other so that towers angle outward nearly 5 feet 5 inches in 12 or 13 floors (a transition floor) and then angle inwards for the next transition.

ENGINEERING During the design and engineering phase, super-tall buildings undergo wind tunnel testing to study wind shear. Building models are placed in wind tunnels to see how wind flows around the model.

Redesign and engineering changes often follow a test to further minimize wind shear forces. One result of the testing, according to David Fields,

a Senior Principal To place the 7,000 at MKA, was the psi SCC 3,000 cubic yard mat, inclusion of a “blow McHugh set up through” floor at seven directthe 83 level, a floor dump locations for ready-mix with no facade trucks and two to further reduce concrete pumps. wind shear. He says It took 10 hours to complete the the building can be placement. expected to sway Photo Credit: about 3-feet in a Joe Nasvik design-level wind event.

An unusual feature of this building is that the outside columns of the towers stagger from floor to floor, shifting 5-inches from the column below so there is no vertical load path to the ground—the corner

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COVER STORY columns move in two directions. As a result, MKA engineered the transition level floors to handle increased outward and inward forces due to the weight and shifting support of the structure above.

BEFORE CONSTRUCTION Alexander says that preconstruction talks for McHugh started in 2012, more than four years ahead of ground-breaking ceremonies in August 2016. “We put together a team to work out constructability details with the design architect, Studio Gang, the Architect of Record, bKL, and MKA. We also determined how to make the construction more affordable.”

Concrete with a high modulus of elasticity (MOE) is necessary for super-tall buildings to increase stiffness and minimize building sway—building inhabitants feel uncomfortable when buildings sway very much in the wind. Testing high

THE BUILDING AT A GLANCE Height: 1190 feet Weight of structure: 500,000,000 pounds Caissons: 124 Concrete: 110,000 cubic yards Steel reinforcement: 23 million pounds Post-Tension Reinforcement: 2.5 million pounds Structural Beams: 156 embedded in concrete Building sway: Approximately 3 feet in each direction Floor forming: 2 million square feet Labor force: approximately 570 workers at time of writing the article

MOE concrete requires certification and special equipment so Flood Testing Laboratories, Chicago, Ill., was hired. Walt Flood IV, Assistant Engineer for Flood Testing says they worked with ready-mix producer Prairie Material Service, Bridgeview, Ill., on trial batches and high MOE concrete mix experimentation about one year before construction began.

The tests included mixes with MOE as high as 8 million psi but in the interest of cost and production reliability MKA decided to specify 7 million psi MOE concrete and engineered the structure for that.

This concrete is used for columns, sheer walls and the core structure of the towers.

The core structure forms are very technically advanced now and require certified workers to move them. The outside form walls roll outward so that ironworkers can install rebar, a platform on the top holds a concrete placing boom that services the entire floor area, and workers can work safely. Six large hydraulic cylinders move the entire structure to the next floor level at the press of a button.

Photo Credit: Joe Nasvik

26 Concrete Contractor | June/July 2018 | www.forconstructionpros.com/concrete

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COVER STORY CONSTRUCTION Caissons Max Levin, the project manager for McHugh Concrete, says there are 124 caissons encased in steel liners and heavily reinforced. Of these 24 are 10 feet in diameter and as long as 115 feet, socketing 6-feet into bedrock. The rest of the caissons are “bell shaped,” meaning that they flare out at the bottom to increase the footprint and decrease the load per square foot on the hardpan soil. These are approximately 85-feet deep.

Mat slabs Fields says there are two mat slabs, one under each tall tower core structure and the thickness is different for each one—8 feet for the shortest tower and 10 feet for the tallest one. A low heat 7,000 psi self-consolidating mix design was used for the mats. The spread of this mix varied between 14” to 27”. The

largest of the mats required 3,560 cubic yards of concrete and it took 10 hours to complete the placement. The purpose of a mat slab is to evenly distribute the weight of the building between caissons. There are also locations where building elements were supported by concrete pile caps to distribute the load between caissons.

Core structure Many or most high-rise buildings today include concrete core structures to contain elevators and protected stairways, allowing for safe exit from buildings in the event of disaster. They are strong structural elements that lessen building sway.

But Fields says they are also commonly used to minimize exterior engineered framing on buildings, giving end users a better view outside.

The shear walls for the Vista Towers are as thick as 54 inches of concrete

WE HAVE YOU COVERED

Concrete for the columns and floors is placed at the same time but the mixes are different, so the very strong highmodulus concrete is placed by crane bucket first. The concrete is purposefully “mushroomed” around the column to prevent contamination with floor concrete which is placed shortly afterwards.

Photo Credit: Joe Nasvik

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Owner: Magellan Development Group Design Architect: Gang Studios, Chicago Architect of Record: bKL Architecture, Chicago Engineer: Magnusson Klemencic Associates, Seattle/Chicago General Contractor: McHugh GC, Chicago Concrete Contractor: McHugh Concrete, Chicago Ready-Mix Concrete: Prairie Material, Bridgeview, Ill. Concrete Testing: Flood Testing Laboratories, Chicago Vertical Forms: Doka USA, Little Ferry, N.J. Deck Forms: Peri USA, Elkridge, Md.

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at the base of the structure, tapering off to 18” thick near the top. Core construction always precedes floor construction by at least one floor and it’s common for contractors to use selfclimbing core-forming systems today.

These systems have decks above the forms to mount concrete placing booms that can place concrete anywhere on floors. When the forms are raised, so is the deck and placing boom.

Floors Structural concrete buildings have a very significant advantage over structural steel buildings because floors are “flat plate” meaning that the bottom of a slab (the ceiling below) is flat, reducing the floor to floor height and the need for supplemental fireproofing or drop-ceilings. As a result there can be more floors in the total height of a building. Floor forming systems have evolved to make this method of floor construction easier

and faster with much of the work safely done from below.

Kevin Morley, McHugh’s concrete superintendent, says that after the parking garages and lower portions of the building were completed the Vista team began a three-day cycle floor construction schedule for each tower—one floor completed every three days in each tower, each being roughly 21,000 sq. ft. This means one deck is placed every day.

In order to construct at this pace, workers must be able to walk on a floor approximately three hours after concrete is placed in order to begin layout work, column forming, and floor forming for the next level.

Placing rebar, post-tension (PT) tendons, structural steel members (when needed), rough plumbing and electrical, and hardware for anchoring curtain walls and other things follows the next day.

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COVER STORY When workers start forming operations for the next floor level, most of the work happens on the floor below. The self-climbing scaffold on the outside of the building provides a safe working environment both in the work area and for workers below. The yellow screen shown here also offers wind protection.

Photo Credit: Joe Nasvik

Floor dimensions vary from floor to floor because the building is constantly angling outward or inward and so form requirements change for each floor.

Columns While interior columns are vertically stacked, the columns nearest the outside edges of the building aren’t. As stated earlier these columns shift 5-inch outward for 12 or 13-floors creating a maximum shift of 5’5” and then they shift back toward the center of the building to the next transition level. Vertical rebar at one side of the column is terminated while rebar is added on the

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other side of the column where the shift occurs. Fields says additional #9 rebar (1-1/8 inch) is added to the transition floors to manage the additional forces generated there.

The concrete mix design for the columns is different than for the floors but they are both placed at the same time. To ensure there is no confusion concrete for the columns is placed just ahead of the floor placement. It is delivered in buckets by the tower crane and overflows the top of the column a little bit, a process called “mushrooming”— concrete for the floors is pumped and placed shortly afterwards.

Shear walls Shear walls (also referred to as “silo walls” on this project) on the outside of the building also move in and out with the shape of the building. The walls are sloped to match the building’s facade and aren’t stepped from floor to floor.

Self-rising forms are used for this construction. Shear walls provide additional strength to help buildings resist wind and seismic forces.

Concrete requirements For super-tall structures the MOE of a concrete mix has become more important than its compressive strength because building stiffness and occupant comfort becomes a critical parameter. Flood says they started testing concrete mixes for MOE before Prairie Materials had the contract. But now Flood Testing works for the owner of the building, casting 9 cylinders for every 50 yards delivered to the site. Testing of cylinders occurs at 28, 56 and 91 days for MOE. The requirement for the highest MOE mix is 7 million psi as an average, with no individual test below 6.3 million psi.

Nick Beristain, the Technical Services Laboratory Supervisor for Prairie Material, says they have

approximately 20 mix designs for the project. This includes 7, 6, and 5 million MOE mixes for different locations in the building, compressive strength mixes of 12,000, 10,000, 8000, and 6000 psi, and 7000 psi low heat development SCC concrete for the mat slabs.

Levin says McHugh has their own constructability requirements for concrete and they include the following: • Mixes must be pump-able up to the 1190 vertical feet height of the building without damaging the pump or pump lines • Concrete for floors must be hard enough for workers to walk on within three hours of placement under all weather conditions.

• Concrete for floors must have a minimum strength of 3000 psi by the morning following placement under all weather conditions so that PT can be tensioned

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• Maximum concrete delivery temperature is 90ºF • All mass concrete (over 5 feet in thickness) must not exceed 158ºF at any time during its curing cycle • Concrete in floors areas that support the tower cranes must have a minimum strength of 5000 psi within 24 hours of placement • Concrete must have a placing slump between 6 to 8 inches.

Only Prairie Material is allowed to increase the slump and only by adding an admixture, not water.

• Prairie Material must meet the volume requirements for each day in a timely manner.

McHugh is using two self-climbing scaffolding systems that use the same hardware for this project. The multi-story system shown here is many floors below the construction level and is being used to install the curtain wall system for the building.

Photo Credit: Joe Nasvik

Most of the concrete is pumped through one vertical pipe the height of the building.

At the time of this writing 81,000 cubic yards of concrete (10,000 truckloads) have been delivered to the jobsite.

Forming McHugh involved Doka USA, Little Ferry, N.J., early in the process.

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COVER STORY Formwork technology continues to change jobsite productivity and self-rising systems are especially important to high-rise construction.

Deian Ivanov, Doka’s Midwest Account Manager, says one of the challenging aspects of this construction is the increasing and decreasing angles of the unique building surface for their self-climbing scaffold systems,

especially as the scaffolds maneuver around the transition floors. Their service to a project includes supervision when forms are first assembled, training, certification of workers, and frequent site visits. Here are the systems being used on the project.

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one floor level to the next. A platform anchored to the top of the forms holds a concrete placing boom which automatically lifts when the forms are raised. Workers can store rebar on the formwork too, close to where iron workers need it for placement.

Shear-wall (Silo Wall) forms.

McHugh is using Doka’s SKE 50 and 100 self-climbing form systems. The outside wall forms are hydraulically lifted but the inside closeup forms are crane set by McHugh. The shear walls follow the angle of the building.

Perimeter scaffolding.

SKE self-climbing scaffold platforms with Doka’s “X-Bright” screening system surrounds the top floors. It prevents tools and materials from accidentally falling to the ground, it provides shelter from the wind when concrete is being placed, and is used to enclose floors for temporary heating. Ivanov says the scaffolds are crane lifted and are attached to the concrete with embeds. A second set of SKE platforms is being utilized for the window wall system installation several floors below.

McHugh is using Peri’s MultiFlex decking system with their MultiProp system to form all the floor slabs for the project.

BIM and cell phones Building Information Modeling (BIM) matches three-dimensional drawings with data bases that provide detailed information about every construction element. BIM is standard now and larger projects employ full-time people to manage BIM drawings on site. McHugh uses Tekla software for their BIM work because it’s particularly good for designing structural concrete work. Morley says they have taken this new technology

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to a new level by providing jobsite foremen access to BIM details through their cellphones.

McHugh set up “hot spots” to ensure good cellphone reception everywhere in the building. Foremen are provided with links to the parts of BIM that affect their work so that they can immediately refer to the latest detail drawings as they are needed.

This artist drawing For example, shows what the complicated rebar building will designs in BIM look like when complete in 2020. can be viewed by Photo Credit: Gang foreman in close Studios and bKL up detail where Arhitecture they are working.

Cody Hague, McHugh Concrete’s BIM detailer for this project can also notify jobsite personal of plan changes on their cell phones.

Morley thinks the day will soon come when jobsites will go “paperless” due to this technology and likes the idea. Levin agrees but says he still likes paper plans.

Super-tall buildings Compared to high-rise construction super-tall buildings pose greater challenges. Engineers must focus much more on wind shear and occupant comfort. Building sway during construction requires contractors to invest in and learn more advanced layout technology. Keeping costs in line is more difficult, a small example being the increased transportation time on skip lifts getting labor to and from their work areas. Weather is more problematic; it can be nice at ground level but snowing at the top of a building. The level of risk goes up for all partners too.

There are three reasons why building structural concrete supertall buildings have become cost competitive with other structural methods; the development of highly

efficient concrete pumping systems, advances in cost productive technical forming systems, and concrete mix designs that can meet all the special needs for these buildings. Concrete construction is faster, more efficient and productive, and the cost is more and more affordable.

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www.forconstructionpros.com/concrete | June/July 2018 | Concrete Contractor 37

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DECORATIVE CONCRETE

By Lou Frank and Chris Thiede

Creating the

PERFECT FLOOR Beautiful, highperformance concrete floors start long before the coating is applied.

D

ocumenting America’s historic vehicles requires a highly specialized floor. So does repairing today’s cars at any modern service center.

The photography studio at the Historic Vehicles Association (HVA) in Allentown, Pa., is used to document historically significant cars for the Library of Congress. The floor of the studio is finished with a specialized coating that optimizes photography while resisting the tire marks and oil spills that old cars inevitably leave behind.

Oil spills and tire marks are also common at any automotive service center, yet the concrete floors at these facilities have a very different job to do. While photography is not a concern, durability is, as the floors must endure not only oil and tires, but also dropped tools and heavy, wheeled traffic.

These two examples illustrate the challenge concrete flooring contractors face every day. Your customers expect you to provide a perfect floor.

But it’s not as simple as putting down a coating and waiting for it to dry.

Every project has unique requirements and parameters. To meet those expectations, you should follow a complete process that starts well before the first coat is applied.

STEP 1: Define Needs & Expectations Every floor is different. It’s an

The photography studio at the Historic Vehicles Association (HVA) in Allentown, Pa., is used to document historically significant cars for the Library of Congress.

The floor of the studio is finished with a specialized coating that optimizes photography while resisting the tire marks and oil spills that old cars inevitably leave behind.

Photo Credit; Coatings for Industry

obvious statement, but it’s a fact that’s often overlooked by building owners and even general contractors.

The needs of a floor vary depending on the type of traffic it will have to endure, the environment it will be in, and the look that’s desired. An aircraft hangar, for example, will be used very differently from a big box retailer. It’s important to know the details of how the floor will be used prior to beginning the project.

In addition, be sure to ask your

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DECORATIVE CONCRETE The topcoat is, obviously, the part of the coatings system that everyone sees.

Factors like resistance to ultraviolet light, abrasion, and chemicals, as well as odor and cure time must be balanced with the desire for gloss or satin finishes.

Photo Credit: Coatings for Industry

Choose the color and texture that meets the customer’s expectations for how the floor will look and feel.

Coatings are offered in flake, metallic, pigmented top coats, and dozens of colors of quartz.

Photo Credit: Coatings for Industry

customers about their expectations for the look and finish of the floor, durability, and how quickly it needs to return to service. The more you know ahead of time, the more you know about what promises you can make.

STEP 2: Understand the Application Needs Once you have an understanding of the needs and requirements of the floor, you need to know what you’re getting into from an application standpoint.

If the floor is new concrete, it’s pretty straightforward. The main information you’ll need to have is how long the floor will have cured prior to the coating application process. Cure time requirements vary by coating system, so be sure the concrete is ready before you start.

Existing concrete floors can get trickier. One of the most important things you’ll want to know is if there are any contaminants, such as oil or other chemicals, below the surface. This can have an effect on the ability for a coating to cure and perform over time.

Finally, make sure you understand what the application environment will be like, particularly the temperature and humidity. It’s also important to know if other areas of the building will

be occupied and used during coating application and curing, as they could be affected by fumes and odors.

STEP 3: Prepare the Surface A coating is only as good as the surface onto which it’s applied, which is why surface preparation is crucial.

For existing floors, look for any old, damaged concrete that needs to be repaired. Also, some coatings require mechanical abrasion in order to adhere effectively. Finally, make sure the concrete surface is clean and dry before you begin application.

STEP 4: Choose the Right Primer The primer is a key component in any coatings system. Primers help the

coatings adhere to the surface and help ensure the long-term durability and performance of the coating. But it’s important to choose the right primer for the application and the environment.

For general/industrial applications, a quick-drying penetrating epoxy, such as WearCOAT 1020, is usually best. In moist environments and green concrete, use a moisture vapor tolerant epoxy, like WearCOAT 1080. Finally, if you need a robust coating that covers physical imperfections and existing chemical spills, use a polyamide epoxy such as WearCOAT 490.

There are, of course, many variables to consider, so be sure to consult with your coatings supplier to choose the right primer for the job.

STEP 5: Choose the Right Topcoat to Meet the Need The topcoat is, obviously, the part of the coatings system that everyone sees. It provides the final look and finish to the floor, but it does more than look good. Factors like resistance to ultraviolet light, abrasion, and chemicals, as well as odor and cure time must be balanced with the desire for gloss or satin finishes.

The adjacent chart shows the primary topcoat characteristics and

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the types of topcoats that provide them. As with primers, it’s important to consult with your coatings supplier to choose a topcoat that meets the specific needs of the project.

STEP 6: Choose Texture & Color Finally, choose the color and texture that meets the customer’s expectations for how the floor will look and feel. Coatings are offered in flake, metallic, pigmented top coats, and dozens of colors of quartz.

Whatever color and texture choices you (and your customer) make, be aware of when in the process they need to be applied.

Some colors and textures need to be applied before the topcoat, while others are mixed with it.

Every floor is different and has specific needs, whether it’s in a customized photo studio, an automotive service center, or one of the countless other applications and environments where concrete is

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While the needs of any given floor are different, the process for specifying the right coating should always be the same. By following the right process, you will help assure that the right coating is selected to meet the needs and environment of the facility. In short, you’ll be on your game to provide a perfect floor that meets your customers’ expectations.

Ed. Note: For more detailed information about concrete floor coating systems for dozens of specific applications, contact CFI for a free Floor Coatings brochure, info@ cficoatings.com.

Oil spills and tire marks are also common at any automotive service center, yet the concrete floors at these facilities have a very different job to do. While photography is not a concern, durability is, as the floors must endure not only oil and tires, but also dropped tools and heavy, wheeled traffic.

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DECORATIVE CONCRETE

By Author

The Decorative Concrete Council Turns TWENTY The Decorative Concrete Council (DCC) functions as an integral part of the ASCC concrete contractor membership but focuses on the specific interests for those involved in the production and installation of decorative concrete.

D

ecorative concrete materials were available as early as the 1890’s in the form of recipes and project designers often included these recipes and directions for contractors when they specified decorative concrete applications.

But the consistency of the results was unpredictable. Lynne Scofield changed that with the founding of his company in 1915. He manufactured color hardeners, integral colors, acid etch stains, and other products that were the same batch after batch and year after year. In 1950, using Scofield color hardeners to color concrete Brad Boman invented large aluminum stamps that could be used to provide brick and stone patterns in fresh concrete. The significance of his invention was that designers and contractors could use his process to exercise their own creativity. In an effort to maintain high quality workmanship the Bomanite Corporation was formed in 1970

to franchise the process to select contractors.

By the end of the 1970’s the Bomanite patent was successfully challenged in court and companies formed to manufacture the stamps in competition with Bomanite. Now anyone who wished could buy stamps and use the process. At the same time other decorative processes were developed (many by contractors) and the decorative concrete industry became much larger. Contractors with a creative interest were especially attracted to this new industry but many established concrete contractor businesses also added decorative to their list of other products.

In 1997 Frank Piccolo, and Wade Cobb, employees of the Artcrete Corporation, Natchitoches, La., manufacturers of paper stencils that could be used for patterning concrete, approached organizations such as the Portland Cement Association (PCA), the American Concrete Institute (ACI), and the American Society of Concrete

Left: In 2000 the DCC conducted decorative concrete demos at the World of Concrete to encourage interest in this growing industry.

Above: The dedication of the Tchoupitoulas Triangle ( Park), in New Orleans, March 18, 2006. DCC volunteers installed decorative concrete and restored the park just 7 months after Hurricane Karina ravaged the city. The project was Frank Piccolo’s idea and he is in the center of the photo with arms crossed.

Contractors (ASCC) with the idea of forming a decorative concrete organization. The ASCC approved the idea and the Decorative Concrete Council (DCC) was born. It would function as an integral part of their concrete contractor membership but would focus on the specific interests for those involved in the production and installation of decorative concrete. Piccolo and Cobb were concerned about the amount of shoddy workmanship being installed around the country and feared that it would cause consumers to make other choices. But they also believed that it would be valuable for members of the DCC to compare

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notes with each other, participate in training opportunities, and promote the industry. The ASCC Board of Directors approved the formation of the DCC in July of 1998. Peter Steiner, ACI, became the first executive director of the group and Mary Hurd wrote the first DCC newsletter. Pat Reardon became the first manager of the DCC. DCC members included both decorative contractors and the manufacturers of decorative materials and tools serving the contractor industry.

Their goals in 1999 were focused on promotion, education, and networking. In line with these goals they sent out their first multi-page newsletter, started a “Troubleshooting” publication to all members to help members understand difficult problems such as efflorescence, and persuaded the World of Concrete to schedule a decorative concrete mega demo which the DCC would conduct.

The first DCC Advisory Council was approved in June 2000 and consisted of the following people: • Frank Piccolo, Artcrete, Natchitoches, Louisiana. The first director of the DCC • Dennis Ahal, president, Ahal Contracting, St. Louis, Missouri • Paul Albanelli, owner of Albanelli Cement Contractors, Farmington, Michigan • Scott Arnold, product manager, Master Builders Technologies, Cleveland, Ohio • Ron Cottingham, Symons Corporation, Houston, Texas • Robert DeMint, Spray-Crete Industries, Tampa, Florida • Jay Fangman, Colorado Hardscapes, Denver, Colorado • Gary Hames, QC Construction Products, Keller, Texas • Howard Jancy, L.M. Scofield Co, Chicago, Illinois. The first secretary-treasurer for the council • Frank Lewis, Sundeck Products, Bell Gardens, California One of their first big accomplishments was to conduct a “Placing Decorative Concrete Flatwork” mega-demo and seminar at the World of Concrete (WOC). They

demonstrated stamping, stenciling, staining and scoring, stampable overlays and micro-toppings. Frank Piccolo, Frank Lewis, and Bob Harris were the presenters.

SPRING FLINGS AND EXPOS In 2006 the DCC held its own training program, a two day EXPO in New Orleans. It provided educational

seminars on topics ranging from management to concrete issues, decorative concrete demonstrations, and ACI Flatwork Finisher Certification training and exams. The event was in response to their goal for training opportunities for training for its members. The events were called “Flings” and “Expos” and became two day spring events held in different cities.

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DECORATIVE CONCRETE For the past several years the DCC has sponsored a concrete project awards program and these are the 2018 winners. Interest in decorative concrete continues to grow.

The first one was hosted by Doug Bannister’s business, The Stamp Store, in Oklahoma City. During the seven years of the program they were held in Tampa, San Diego, Columbia, SC, New Orleans, a second time in Tampa, and Phoenix. There were live demos and classroom sessions and members often helped with the placing and finishing of concrete.

COMMUNITY PROJECTS After the Hurricanre Katrina devastated New Orleans in August of 2005 Piccolo urged the DCC to

get involved in a project that would commemorate the event and show support for the city. Working with the city government and a local architect it was decided to restore and dedicate a small park in the downtown area to the disaster. Approximately 30 DCC members volunteered their time and money to help with the project and the event became an emotional experience for everyone. The following year the DCC held its spring training expo in New Orleans, thinking that the town needed people to visit the city and the revenue that came with it. The

city held a small dedication ceremony at the park as a part of this event.

The idea of volunteering projects that helped people, groups, and worthwhile organizations resonated with DCC members over the years since ten community projects have been completed around the country and more are planned. The projects have grown in complexity and creativity over time and the goal is to contribute to the worthwhile efforts of other organizations.

The DCC is turning twenty years old this year and almost none of the people who started it in 1998 are involved anymore but Bev Garnant, the executive director of the ASCC, says that the membership of the DCC has grown to 278 members and the organization remains strong and healthy.

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Using the curb and gutter machine with the Trimble PCS900 Paving Control System and a Trimble SPS930 Universal Total Station helped his team to cut about two weeks off the two-month project.

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Wm. Winkler Speeds Curb and Gutter Work and Site Positioning by 25% 100-year old concrete and civil construction contractor drives productivity on every job by performing stakeout and site measurements without surveyors, using 3D models and leveraging machine control on dozers and curb and gutter machines.

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honor the legacy Wm. Winkler has integrated Trimble of his family and equipment into the company almost every aspect founders. of the business, from survey and layout to Wm. Winkler concrete paving and continues to earthwork. look for ways Photo Credit: to improve Wm. Winkler productivity and drive efficiencies by leveraging innovation and good old-fashioned ingenuity. In fact, the company recently completed a project for the Port of Walla WallaBurbank Industrial Site using a nextgeneration concrete product known as Compacted Concrete Pavement (CCP). CCP uses additional additives and finishing processes to enhance

46 Concrete Contractor | June/July 2018 | www.forconstructionpros.com/concrete

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Since 2010, Wm. Winkler has integrated Trimble equipment into almost every aspect of the business, from survey and layout to concrete paving and earthwork. That includes the Trimble GCS900 Grade Control System on dozers and graders, as well as the Trimble PCS900 Paving Control System on a slip-form Wirtgen curb and gutter machine. It also includes Business Center – HCE for 3D modeling and Trimble site positioning for performing measurements, stakeouts and as-builts. For instance, Wm Winkler is hired for a lot of subdivision work for various developers. After performing an initial topographic survey of the subdivision and using the site plan from the engineer, the team develops a 3D model with Business Center – HCE, which includes the sewer, water, storm drainage, utility crossings, fire hydrants, curb, sidewalk, curb gutters and other assets.

Then, without waiting on a professional surveyor, site engineers, foremen and other crew members use Trimble SCS900 Site Controller Software on the Trimble Tablet to perform accurate positioning, and to stake, measure and

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record information across the site. Winkler explains this might also include staking footings, pilasters and bolt patterns working from the 3D design model.

CUTTING TIME ON THE PROJECT

BY ABOUT 25%

Without waiting on a professional surveyor, crew members use Trimble SCS900 Site Controller Software on the Trimble Tablet to perform accurate positioning, Photo Credit: Wm. Winkler

“We’ve integrated Trimble equipment across almost our entire business,” says Winkler. “When we go out to a site now there’s very little, if any, wood in the ground, because we just do everything off the model – sewer, water, curb and walk, right up to paving.

For every month of work, we are able trim approximately

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www.forconstructionpros.com/concrete | June/July 2018 | Concrete Contractor 49

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PRODUCT FOCUS

Winkler explains that using the curb and gutter machine with the Trimble PCS900 Paving Control System and a Trimble SPS930 Universal Total Station helped his team to cut about two weeks off the two-month project.

Photo Credit: Wm. Winkler

W I N C H E S

T SPECIAL

Y INDUSTR RUCTION ST N O C HE ES FOR T Y WINCH

five days off the schedule using GPS and machine control. What used to take us 20 days can now be done in 15, which we love and the customer loves.”

Towards the end of the project, the team may use the positioning system for summarizing the quantities across the project, whether that’s cubic yards of dirt, linear feet of sewer, square yards of pavement, or weight of recycled material collected.

“We also run a full recycle facility where we recycle construction materials because we are a big proponent of the environment and, well, because it’s just doing the right thing,” says Winkler. “We use the SPS930 Universal Total Station for measuring stockpiles and quantities as well because it it’s all accurate, quantified and neat and tight.

Because of technology, we haven't had to spend much time in the field doing traditional survey or putting stakes in the ground, which is a big time and money saver.”

WORKING AT NIGHT WITH ZERO STRING

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On a recent project for the Washington State Department of Transportation (WSDOT), Wm. Winkler put its Wirtgen curb and gutter machine to the test. The company was hired to complete about eight miles of curb and gutter work on Bob Olsen Way in Kennewick, Wash..

Winkler explains that using the curb and gutter machine with the Trimble PCS900 Paving Control System and a Trimble SPS930 Universal Total Station helped his team to cut about two weeks off the two-month project. The team accomplished this setting zero forms and zero string lines, “Utilizing PCS900, the SPS930 Universal Total Station

ForConstructionPros.com/10072208

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Without the Trimble PCS900 system providing guidance for its slip-form machine, the team would have had to set string.

Photo Credit: Wm. Winkler

and our slip forming machine means that we are able to save a lot of labor and deliver a product much earlier and much cleaner because we don’t have to set any string,” says Winkler.

“In the past, the day before we poured, the surveyor had to go and set the base control and run a level loop. Now, they are pouring within a couple hours of being there, cutting out at least a day of survey and set-up up front.”

On another WSDOT project, Wm. Winkler was hired for curb and gutter work for a two-and-a-half mile stretch on US Highway 2 in eastern Washington. The work included setting up a traffic island on top of the asphalt roadway, in addition to putting in top-mounted curb.

Part of the challenge of the project is that most of the work had to be completed at night, outside of heavy traffic hours. This meant the work

window was extremely tight. Winkler explains that without the Trimble PCS900 system providing guidance for its slip-form machine, the team would have had to set string. Instead, the team could basically show up and start pouring concrete immediately.

When asked about the secret to having a company that’s been around for 100 years that continues to innovate, Winkler is humble in his response.

“I would say we have to applaud our people for embracing the new technologies and not getting stuck in their ways just because they’ve worked fine in the past,” says Winkler. “We’re always striving to do more, learn more and deliver more value to our customers. These new technologies help us refine our skills and that really make us more productive.”

DITEQ Corporation • 9876 Pflumm Road • Lenexa, KS 66215 Tel: 866-688-1032 • Fax: 877-220-4777 • www.DITEQ.com ForConstructionPros.com/10072749

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CONCRETE TECHNICAL

By Mike Boenisch

Protect Your Concrete from Heavy Rains and extreme temperatures Strategies for mitigating issues that even slightly inclement weather can bring when placing concrete.

Y

ou might hear it from clients all the time: If the city can patch streets and sidewalks any time of the year, then why can’t they place concrete for a new driveway during the dead of winter too? A sensible answer, of course, is that a stretch of road or sidewalk needing constant repair might tell you all you need to know about the job’s quality. Poor weather is dangerous for concrete, and pouring it without optimal conditions often means it will need more repairs down the line.

Even so, no one has the luxury of working in ideal temperatures or perfectly sunny days all the time. Though you may already know about some common weather hazards in the concrete world, you may not know about potential solutions. There are several strategies for mitigating the issues that even slightly inclement weather can bring, but there are also scenarios where it’s usually best to just halt work and wait for a more suitable day. Knowing when and how to explain these issues to clients can be valuable as well.

Concrete is a fickle beast. It’s best to set up expectations early, as well as explain how projects large and small can go downhill quickly with even slight fluctuations

in temperature. In the best conditions, concrete will take between four and six hours to set – perhaps as many as eight. But if the temperature drops to even a relatively cool 50 degrees, concrete will need about 10 hours to properly set. As the time window expands, problems can be compounded.

When the surface temperature and the air temperature are in freezing realm, concrete simply can’t be placed properly. If concrete freezes,

you’ll lose half of the 28-day cure strength, potentially leaving it too weak for its intended application. When the surface is frozen, you can try thawing it out with heaters prior to placing the concrete, but then the placement becomes difficult to maintain and control. (Don’t even think about trying antifreeze – it will ruin your concrete entirely.) Another potential solution for placing in colder climates is using a magnesium-phosphate based concrete mix, which is often used to place highway road repairs and in big walk-in freezers. This kind of mix can generate enough heat to boil an egg, making it useful for environments where cold temperatures can’t be avoided. However, these mixes are often expensive.

If you absolutely must work through cold temperatures, a concrete blanket is often the best way to retain heat. Concrete will naturally generate its own heat thanks to chemical reaction as it sets (known as “kicking heat”). If you can get a blanket for the concrete, it will serve as an insulator and contain the muchneeded heat. Even so, the best time to place concrete is when air, mix and substrate temperatures are between 40 and 90 degrees, with no rain in the forecast within 24 hours of application.

Extremely high temperatures will cause problems of their own by prompting concrete to set too quickly.

If it flash-sets, you’ll lose the mix

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as you’re pouring and end up with cold joints between the pours. High heat puts the project at big risk and when the concrete hits its first freeze cycle, it will crack the cold joints. One potential remedy is using ice water to retard the set time, giving you more opportunity to work with it.

RAIN Then there’s the problem of rain.

If there’s a severe downpour and too much groundwater gets into the concrete, the concrete will weaken.

To avoid this problem, you’ll need to cover off the area and try to keep the rain as far from it as you can. If the concrete has time to set and you can keep the penetrating water from getting to it, this will keep your pour from becoming weak. So, keeping it covered is crucial.

Tell clients when they spot tree roots or debris in the slab, not to mention some cracks sprouting, there’s no time to wait. A professional needs to open the concrete up and do repairs to keep moisture from seeping in.

When damage is definitively identified, it’s time to determine the extent of it to figure out what needs to happen next. To get a reliable idea of how deep the issues run, pressure washing is a good place to start. If that chews up the concrete, it needs to be removed. If it leaves you with a stable substrate, then you can look into resurfacers. These aren’t too difficult to use, as long as you have a clean and sound substrate.

APPLY A SEALER So how can you encourage homeowners to maintain their concrete?

Let them know how important it is to seal it – and not just once. Lots of people think that once they’ve put the sealers down, they’re set forever.

But the truth is, a lot of sealers don’t even last six months. UV rays and other elements can hit concrete hard, so the best thing any owner can do for their concrete is keep it clean and maintain the sealer.

No matter what kind of issues a client is dealing with, one of the most important pieces of advice you can

give is to encourage them to seek help from the professional when it’s necessary. Though a DIY approach can save some money, it’s often not worth the hassle (or mess) in the end. Concrete, after all, is hard work, and plenty of new users are surprised at just how difficult it can be to mix and apply properly. Too many inexperienced DIYers attempt to add extra water to

their concrete mixes, making it easier to work with but disastrous once it sets. Ultimately, concrete requires the skill and expertise of someone who understands potential hazards and is prepared to deal with them.

Ed.Note: Mike Boenisch is the Manager of Technical Services/Risk Management at Sakrete of North America at Oldcastle.

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Retail Stores Grocery Stores Warehouses Restaurants Commercial Kitchens Freezer/Cold Rooms Loading Docks Car Dealerships Schools Hospitals Veterinary Clinics Parking Garages Water Treatment Plants Machine Shops Heavy Industry Floors Food Processing Facilities Pharmaceutical Clean Rooms Aircraft Hangars Airport Terminals Train Stations Offices Car Washes Breweries Wine Cellars Retail Stores Grocery Stores Warehouses Restaurants Water Treatment Plants Freezer/Cold Rooms © 2018 Coatings For Industry, Inc. All Rights Reserved. Wearcoat® and the Coatings For Industry® Teardropare registered trademarks for Coatings For Industry, Inc.

ForConstructionPros.com/10696594

www.forconstructionpros.com/concrete | June/July 2018 | Concrete Contractor 53

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SPECIFICATION GUIDE: CONCRETE SAWS

Walk-Behind Concrete Saws

A compilation of technical information when choosing your next walk-behind concrete saw.

1 U.S. Saw JS-130

The U.S. Saws JS-130 is an up-cut saw designed to mill out debris or old joint fill material prior to filling control joints with epoxy or polyurea. The up-cut blade rotation ejects the debris into a vacuum port on the blade guard where the dust collector can capture it. Fully boxed heavy gauge steel frame for extra long life and straight accurate cuts. Proudly made in the U.S.A. ForConstructionPros.com/21007218 Model

Max Depth of Cut (inches)

Max Blade Size

Hyrdraulic or Mechanical Blade Lowering Device

Wet Cut or Dry Cut

Onboard Dust Collector

Engine

Horsepower

JS-130

3”

10”

Mechanical

Dry

No

Honda GX390

13

2 CS8 Random Crack Saw from General Equipment

Ergonomically designed for ease of use, handling/control and safety plus low maintenance and high productivity. Features include: Extra heavy duty frame and sealed swivel casters; 8 inch diameter, rubberbacked rear casters; extra capacity, twin row, externally greased bearings; 1 inch arbor shaft; twin V-belt reduction system; Quik-Pitch blade engagement system; down cut blade rotation with operator clean line of site; 3 inch diameter dry cut dust port plus wet cut dual water feed system ports.

ForConstructionPros.com/10078454 Model

CS8/GH Random Crack Saw

Max Depth of Cut (inches)

Max Blade Size

1-1/2”

8” nominal diameter segmented blades in 0.250, 0.375 & 0.500 cutting widths

Hyrdraulic or Mechanical Blade Lowering Device

Wet Cut or Dry Cut

Onboard Dust Collector

Engine

Horsepower

Mechanical

Can do both. Wet cutting requires General Equipment Company CS8-1000 valve controlled water feed system kit.

No, separate.

VS220 DUSTCOLLECT-R system is available

Honda GXV390

13

3 MK Diamond SRX-2000 Early Entry Saw

The SRX-2000 Green Cut Early Entry Saws are engineered for early entry sawing of crack control joints. There are two SRX-2000 models, a pull start and electric start, both powered by a Honda GX 270 Engine. The remotely mounted throttle and stop switch allow for quick operator access. There is an easy release depth control lever for convenience. The SRX-2000 has an up-cut blade rotation, which facilitates in keeping debris out of the joint. The anti-spall, skid plate aids in keeping the edge of the joint smooth.

ForConstructionPros.com/21007197

Model

Max Depth of Cut (inches)

Max Blade Size

SRX-2000

1-5/8”

10”

Hyrdraulic or Mechanical Blade Lowering Device

Wet Cut or Dry Cut

Onboard Dust Collector

Engine

Horsepower

Mechanical

Dry

No

Honda GX270

8.5

54 Concrete Contractor | June/July 2018 | www.forconstructionpros.com/concrete

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4

Diteq G-TEQ Concrete control joints should be cut before the concrete cures to prevent random cracking caused by the curing process. DITEQ G-TEQ Early Entry Saws incorporate state of the art technology to cut clean joints in “green” concrete without raveling, chipping or spalling.

• Early entry green concrete saw and diamond blades for prevention of random cracking in newly poured green concrete • Up-cut saw with patented FlatTrac wheel system to prevent spalling • Available with 4.5-hp Subaru gas engine or 1.5-hp electric motor ForConstructionPros.com/10091207

5

Model

Max Depth of Cut (inches)

Max Blade Size

Hyrdraulic or Mechanical Blade Lowering Device

Wet Cut or Dry Cut

Onboard Dust Collector

Engine

Horsepower

G-TEQ 550H

1.5”

6.5”

Mechanical

Dry

No (but it has a port to attach a vacuum hose)

Honda GX160

5.5

Model

Max Depth of Cut (inches)

Max Blade Size

Hyrdraulic or Mechanical Blade Lowering Device

Wet Cut or Dry Cut

Onboard Dust Collector

Engine

Horsepower

G-TEQ 200E

1.5”

6.5”

Mechanical

Dry

No (but it has a port to attach a vacuum hose)

Electric 120 V, 1 PH, 17 FLA

2

Diamond Products CC2500 Medium Walk-Behind Saw The CC2500 medium walk behind saw delivers the power of a large saw in a compact size.

The heavy-duty frame design handles the toughest jobs. With a 26” blade capacity, the CC2500 is great for utility work and has a self-propelled drive that makes it easy to handle.

ForConstructionPros.com/21007188

6

Model

Max Depth of Cut (inches)

Max Blade Size

Hyrdraulic or Mechanical Blade Lowering Device

Wet Cut or Dry Cut

Onboard Dust Collector

Engine

Horsepower

CC2500

10-3/8”

26”

Mechanical

Wet

No

Honda GX690

22.1

Model

Max Depth of Cut (inches)

Max Blade Size

Hyrdraulic or Mechanical Blade Lowering Device

Wet Cut or Dry Cut

Onboard Dust Collector

Engine

Horsepower

CC7574DD

19-3/4”

48”

Hydraulic

Wet

No

Deutz Diesel

74

Model

Max Depth of Cut (inches)

Max Blade Size

Hyrdraulic or Mechanical Blade Lowering Device

Wet Cut or Dry Cut

Onboard Dust Collector

Engine

Horsepower

CC3700E

17-3/4”

42”

Hydraulic

Wet

No

Baldor

40

Medusaw Walk-Behind SKILSAW The 7-In. model SPT79A-10 MEDUSAW walk-behind worm drive saw provides a complete, ergonomic solution for scoring concrete in large-area applications.

• Dual-Field worm drive motor with added overload protection • Adjustable arm extends to the user’s height and folds and locks into place for transporting and storage • Larger handle and two-finger trigger provide greater control when making long cuts • Ambidextrous side assist handle provides added support ForConstructionPros.com/20986024 Model

Max Depth of Cut (inches)

Max Blade Size

Hyrdraulic or Mechanical Blade Lowering Device

Wet Cut or Dry Cut

Onboard Dust Collector

Engine

Horsepower

SPT79A-10

N/A

7”

Mechanical

Wet and Dry

Yes

N/A

N/A

www.forconstructionpros.com/concrete | June/July 2018 | Concrete Contractor

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CONCRETE TECHNICAL

By Jason Spangler

Updated ASTM F2170 Reflects the Newest Science about

RH TESTING For years now, the in situ relative humidity (RH) test for measuring the moisture condition of concrete has been shown to be the most reliable, accurate test available.

A

s far back as the 1960s, laboratories at the Portland Cement Association conducted controlled tests that verified the accuracy of RH testing.

This research was followed by years of additional testing at Lund University in Sweden and elsewhere. In 2002, ASTM International first established the F2170 standard for conducting RH tests on concrete slabs.

The research confirmed two key discoveries: • An RH test’s accuracy is dependent on taking a measurement of the moisture below the surface of the slab.

• The RH percentage at a specific depth indicates the actual amount of moisture that the finished floor product will “see” once the flooring installation is completed.

Other methods typically involve taking measurements only at the surface of the slab. As the research has found, a surface-based moisture test can’t provide an accurate measure of

a slab’s true moisture condition. That’s because it doesn’t account for the moisture conditions deeper within the slab, and those conditions are typically quite different than conditions at the surface.

THE STANDARD EVOLVES The initial ASTM F2170 for in situ RH testing was established in 2002—placing the test probe at 40 percent depth for slabs poured on grade or 20 percent for slabs drying from both sides.

Until now, the ASTM F2170 standard has required a 72-hour waiting period between drilling the test holes where the RH probes are placed and taking official RH measurements. In practice, readings are often taken before the 72 hours has passed, so contractors have an idea of how things are trending. But because the official readings couldn’t be taken before 72 hours, that meant all decisions and work were basically on hold for those three days. Full stop.

In 2014, a Precision and Bias (P&B) study, commissioned by the ASTM committee, tested for differences in RH readings at various intervals within the 72-hour period. In part, the idea was to assess if it is actually necessary to wait the full 72 hours for an accurate, actionable moisture readings.

The P&B study results clearly documented that readings taken at the 24-hour mark were statistically equivalent to those taken at the 72-hour mark. This is big news.

So big that the P&B results motivated the ASTM F2170 committee to revise and publish an updated F2170 standard reflecting these new findings.

TWO FULL DAYS SHAVED OFF After properly inserting the RH probes into the concrete slab, general contractors and flooring professionals can expect to make decisions on how to move forward in just 24 hours.

If the 24-hour reading shows the concrete slab is still retaining too much moisture, mitigation steps can be taken immediately to accelerate the drying process. If the 24-hour reading shows that the slab’s moisture condition is within manufacturer specifications for the finished floor products, then the flooring installation can begin.

No other test method is as fast or as reliable. Surface-based tests don’t yield reliable results.

The science validating the RH test as the more accurate and reliable test for concrete moisture continues to pile up. And now, with the updated ASTM F2170 standard reducing the RH test time by a full two days, your project’s timeline can benefit from the science too.

56 Concrete Contractor | June/July 2018 | www.forconstructionpros.com/concrete

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Idea File

ONE PRODUCT, FOUR USES Considerable effort and multiple products go into keeping tools and equipment in optimal working order, both when they’re actively in use and when they’re in storage. For a concrete contractor, this equals time spent finding the right product for every need and money spent on individual products with singular purpose. So, what if you had one product that took care of everything, reduced inventory costs and meant fewer products to store on the job site?

Four-Act by Nox-Crete is a 4-in-1 product that covers a variety of your end-to-end job site needs.

Uses for Four-Act: 1

Prevent the accumulation of concrete buildup and splatter on tools and equipment

2

Soften existing buildup on forms and equipment

3

Season new aluminum forms

4

Form release agent, when diluted

Consolidated products, multiple uses, reduced costs and great results!

IT’S A 4-WAY WIN!

www.forconstructionpros.com/concrete | June/July 2018 | Concrete Contractor 57

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Idea File Simpson Strong-Tie SET-3G™ high-strength epoxy anchoring adhesive is uniquely formulated to install and perform in a variety of environmental conditions and temperature extremes, and is now code listed. ®

Featuring exceptionally high bond-strength values, SET-3G is the first anchoring adhesive in the industry to permit ductile anchorage 13/4" away from a concrete edge.

Key Features 1. Included nozzle ensures 1:1 ratio and allows for installation in downward, horizontal and overhead orientations 2. Code listed 3. Install in dry, water-saturated or waterfilled holes in temperatures between 40°F (4°C) and 100°F (38°C) 4. Proudly manufactured in the USA For more information about SET-3G high-strength anchoring adhesive, including detailed strength design data tables for various surfaces and drill bits, code listings, cure times and more visit strongtie.com/set3g.

AMERICA SHOWCASES LOOP BELT ››››› SCHWING TELESCOPINGCONVEYORS IN NEW VIDEO ››››› Schwing America, is announcing the release of a video highlighting the unique features of the company’s Loop Belt truck-mounted telescopic conveyors. A worldwide designer, manufacturer and distributor of premium concrete production and handling equipment, Schwing hopes the new video introduces the company’s Loop Belt conveyor line to a wider customer base.

The technologically superior Loop Belt conveyors provide contractors a cost effective solution to precisely place concrete, sand or aggregates on their projects. With more reach and operator friendly features, the conveyor’s 20’’ wide belts allow as much as 40 percent more material delivery, cutting operation time and costs. Additionally, with a 40-meter, 5-section telescopic boom, the conveyors can place material in limited access structures, areas with height restrictions and more.

“Our Loop Belt telescoping conveyors provide customers another tool in their arsenal to win additional business,” states Tom O’Malley, senior vice president of sales & marketing for Schwing America.

“Plus, the innovative design of the Loop Belt offers the lowest cost of ownership for conveyor owners because you can run the belts 40% slower for the same output as competitive models.”

Customers can learn more information about Schwing’s Loop Belt telescopic conveyors by accessing the new video at www.schwing.com.

ABOUT SCHWING AMERICA Schwing America is part of the Schwing Group, headquartered in Herne, Germany with plants as well as sales and service centers in several countries. Located in St. Paul, Minn., Schwing America manufactures industry leading concrete pumps, truck mixers, reclaimers, long reach hydro excavators and genuine parts for distribution in North and Latin America. http://schwing.com

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BONUS EXPOSURE AND BONUS DISTRIBUTION CALL US TODAY FOR A CUSTOMIZED PROPOSAL AT 800-538-5544

EXTENDED-JOINT SPACING MORE THAN A CONCRETE MIX A big and costly challenge for owners and facility managers of heavily trafficked slabs-on-ground is the maintenance of joint edge deterioration and corner cracking. So, what if these assets had fewer joints?

In 2002, BASF published a methodology to permit extension of joints in concrete slabs-on-ground. And by 2011, BASF formalized their unique extended-joint spacing system. The company’s system extended the joints for a conventional 12-in. thick slab from 22-ft to 60-ft for a large equipment manufacturer in the Midwest. In addition, a truck garage warehouse slab with joint spacings of up to 100-ft.

The BASF extended-joint spacing system is more than a concrete mix—it’s a design and construction solution. Dr. Charles Nmai, manager of Engineering Services for BASF adds, “We believe the extended-joint spacing system will forever change the way slabs-onground are constructed.”

Photo courtesy of Cemstone

WWW.MASTER-BUILDERS-SOLUTIONS.BASF.US

PROGRESSIVE BY NATURE. PROVEN BY HERITAGE. Heavy-duty cutting, impressively durable design, easy starts and comfortable handling – all in an easyto-handle package, guaranteeing efficiency and increased performance.

With the new K 770 power cutter, Husqvarna Construction Products takes yet another step forward in helping you achieve the perfect cut.

Highlights of the K 770 › Spring-loaded, semi-automatic SmartTension™ system ensures the drive belt is always kept in the correct tension. This ensures optimal power transmission as well as minimal wear on the belt. › Design of the saw increases the exactness and force of the cut, while the low weight and the vibration-damped handles ensure comfortable handling during long, productive work shifts. › Magnesium-cast crankcase has a three-bolt joint to attach the cutting head, delivering higher torsional rigidity and maximizing longevity and durability in all conditions.

https://www.husqvarnacp.com/us/machines/power-cutters/

www.forconstructionpros.com/concrete | June/July 2018 | Concrete Contractor 59

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Idea File

VANGUARD COMMERCIAL POWER Vanguard’s latest innovation — a complete line of single-cylinder, horizontal-shaft commercial engines — was designed from the ground up based on user input. The new line spans 5.0 to 13.0 gross horsepower* to meet power requirements for a wide range of global commercial applications. By focusing on key points of performance critical to overall productivity, the new engines leave other manufacturers scrambling to keep up in areas including starting, maintenance intervals, service and support, and total cost of ownership. For example, Vanguard cut the number of oil changes and air filter replacements in half with the new engine’s industryleading oil management and air filtration systems. This means less money spent on air filters and oil, less time in the shop, and equipment that is simply more productive.

Visit www.vanguardengines.com to learn more. *Power levels are stated gross HP at 3,600 RPM per SAE J1940.

Pour concrete up to 60% faster and with less labor!

Powered by 12 horsepower gasoline engines, the Line Dragon will easily maneuver over rebar grid, radiant heat lines, nelson studs, floor decking or other prepared surfaces. Weighing in at about 1,000 pounds means less weight per square inch of footprint than most manual laborers. The ‘Placer’ is attached to the end of the delivery line and places concrete where you need it while the ‘Dragger’ is 20’ away keeping the excess line out of the pouring area.

Our machines move forward, backward, left, right or oblique. The placing boom swings 360 degrees making all areas accessible to the Placer. Both machines are radiocontrolled with fully hydrostatic controls for easy operation at a safe distance making your employees more efficient with huge savings.

717-875-1153 www.linedragon.com 60 Concrete Contractor | June/July 2018 | www.forconstructionpros.com/concrete

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BONUS EXPOSURE AND BONUS DISTRIBUTION CALL US TODAY FOR A CUSTOMIZED PROPOSAL AT 800-538-5544

Creating the Perfect Floor From surface prep to the final application, WearCOAT Systems deliver unparalleled performance and durability that has been proven over decades. See why WearCOAT products make all the difference. To select the right system for your next project, download our free brochure at http://cficoatings.com/industrialand-architecture/floor-coatings.

COATINGS FOR INDUSTRY, INC. 319 Township Line Rd. • Souderton, PA 18964 P: +1 (215) 723-0919 • F: +1 (215) 723-0911 www.cficoatings.com • info@cficoatings.com

QUIKRETE® ADVANCED POLYMER SEALANTS & ADHESIVES

N

EW

QUIKRETE® Advanced Polymer Sealants & Adhesives are a solvent and isocyanate free line of high-performance, commercial-grade flexible repair and bonding materials that meet ASTM C920 standards. Designed to deliver or exceed the performance of traditional polyurethane or silicone sealants and adhesives, the QUIKRETE® Advanced Polymer Sealants & Adhesives are five single-component, environmentally-friendly alternatives.

*10 is highest ranking

www.quikrete.com

www.forconstructionpros.com/concrete | June/July 2018 | Concrete Contractor 61

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Idea File BUY AMERICA TIE WIRE IS NOW AVAILABLE

Tiewire TW898 USA

MAX CO. LTD American-Made Steel Tie Wire

TW898 USA WIRE BUY AMERICA CERTIFIED WIRE STEEL IS MELTED, ANNEALED AND DRAWN IN THE U.S.A STEEL MILL CERTIFICATION AVAILABLE TW898 USA WIRE IS FOR USE WITH MAX RB397, RB398, RB517 AND RB518 REBAR TYING TOOLS.

CONTACT A MAX REPRESENTATIVE FOR MORE INFORMATION.

WWW.MAXUSACORP.COM 800-223-4293

Achieve high-gloss polished concrete floors with more clarity with the TRU® Flooring System.

Formulated with Rapid Set® Cement, TRU is ideal for floors that are stained, integrally colored, and decorative embedded aggregate flooring. Grind wet or dry, and polish in 24 hours.

Call 888-314-3653 or visit CTScement.com.

Beautifully color flatwork, vertical concrete surfaces, and stamped concrete with Brickform Cem-Coat.

Ideal for restoration, color repair, and customization, roll or spray Cem-Coat for durable, brilliant color with fast turnaround times.

Combine with stencils, tape, or stains for BEFORE custom designs.

AFTER

www.brickform.com 800-624-0261

STEGO® INSTALLATION SUPPORT

Peace of mind is of great value…a free service offered by Stego Industries

When you choose Stego Barrier Solutions and products, you gain access to a large nationwide network of full-time technical sales representatives providing unmatched local support and service.

Stego Installation Support – where our industry leading experts back up the high quality of our products Please contact us to get in touch with the nearest Stego representative. We look forward to working with you on your next project.

(877) 464-7834 | www.stegoindustries.com 62 Concrete Contractor | June/July 2018 | www.forconstructionpros.com/concrete

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BONUS EXPOSURE AND BONUS DISTRIBUTION CALL US TODAY FOR A CUSTOMIZED PROPOSAL AT 800-538-5544

CURB ROLLER MANUFACTURING is the leader in shaped concrete roller screeds. We are the only place to go for custom v-gutter, flume, swale, curb, and threshold roller screeds. If you have a need for your screed, contact us today!

785-467-3132 www.curbroller.com

Damage to newly poured concrete slabs or decorative colored floors caused by light construction traffic can be costly. Protect your site from latent damage during construction and remediation projects with Transguard®concrete slab floor protection sheets.

For more info visit www.reefindustries.com

SAVE BIG WITH OUR UPPER DECK PACKAGE Act now and save on our exclusive bundle: > Somero S-485 Laser Screed® machine > Somero SP-16 Hose Placer > Somero SP-16 Hose Puller > Unique Hose Pans > Column Clamp Assembly > Lift Harness Available Placement Options: - Laser Level - Constant Depth

(239) 210-6519

WWW.SOMERO.COM

www.forconstructionpros.com/concrete | June/July 2018 | Concrete Contractor 63

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Idea File

This is U.S. Saws’ JS-130. It is an up-cut saw designed to mill out debris or old joint fill material prior to filling control joints with epoxy or polyurea. The up-cut blade rotation ejects the debris into a vacuum port on the blade guard where the dust collector can capture it. Fully boxed heavy gauge steel frame for extra long life and straight accurate cuts.

Proudly made in the U.S.A.

www.ussaws.com

Lythic Polished Concrete Products offer a complete flooring solution with unique colloidal silica technology.

100% reactive silica ensures the concrete is chemically hardened prior to mechanical polishing. Use Lythic Densfiers, Protectors, and Cleaners for long lasting performance.

For more information, visit www.lythic.com

www.solomoncolors.com • www.lythic.com 800.624.0261

The Next Generation Of Decorative Concrete Flooring...

Aurora Epoxy Dust is a new type of epoxy floor system unlike anything the industry has seen before.

A high definition 3D image is achieved by blending metallic pigment with clear epoxy binder that results in seamless sheer elegance. Aurora Epoxy Dust reflects light rather than absorbing it, producing a floor that has more depth and dimension than is obtainable with concrete staining.

Our system provides the ultimate uniform surfacing solution. Professional contractors recognize the true value of a fast application process that greatly decreases down time, potential for non-uniformity and other stress factors associated with concrete stains and overlays. To learn more about Aurora Epoxy Dust visit our website at www.mckinnonmaterials.com or contact us at 1-866-622-7031.

64 Concrete Contractor | June/July 2018 | www.forconstructionpros.com/concrete

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BONUS EXPOSURE AND BONUS DISTRIBUTION CALL US TODAY FOR A CUSTOMIZED PROPOSAL AT 800-538-5544 Developed to fill/repair concrete floor surface imperfections such as air holes, popouts, surface pitting, scratches and gouges, etc.

•

Available in 7 colors to best camouflage floor surface pitting and surface imperfections.

•

Rapid-set formula allows for quick access to floor areas and grinding as early as 1 hour after application.

•

Low viscosity allows for penetration into very small surface pits and imperfections.

•

Yields a smoother, denser floor surface.

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Economical, hand mix formula.

BACKSAVER is a revolutionized way to drill, it attaches to a hammer drill and allows you to stand during dowel drilling.

It attaches to Dewalt, Bosch, Makita, and Hilti hammer drills.

Before

After 800.223.MM80 www.metzgermcguire.com

Clogged vacuum filters are a problem. Pulse-Bac solves this with our Automatic Pulse-Clean Technology™ that cleans the filter while you work. Others may claim to have “pulse” filter cleaning, but look closely and you'll see they fall short of the original.

Only vacuums with the Pulse-Bac® name use our patented technology.

Purchase online at www. hammerdrillattachment.com

www.pulsebac.com

INDEX ADVERTISER..........................................PAGE BackSaver........................................................................................ 30, 65 BASF Admixture Systems N.A......................................................... 5, 59 Bloom Manufacturing Inc..................................................................... 50 Brickform, A Division of Solomon Colors, Inc.............................. 49, 62 Briggs & Stratton Corporation...................................................... 17, 60 Caterpillar*............................................................................................ 47 CDC Larue....................................................................................... 41, 65 Coatings for Industry...................................................................... 53, 61 Collomix USA........................................................................................ 32 Crafco Inc................................................................................................ 7 CTS Rapid Set Cement Mfg Co.................................................... 36, 62 Curb Roller Mfg. LLC...................................................................... 63, 65 Decorative Surface Solutions Group................................................... 45 Diteq Corp...................................................................................... 51, 61 Driltec, Inc............................................................................................. 48 Husqvarna Construction Products........................................... 34-35, 59 Line Dragon, LLC............................................................................ 15, 60 Max USA Corp................................................................................ 19, 62 McKinnon Materials, Inc................................................................. 39, 64 Metzger/ McGuire.......................................................................... 41, 65 Nox Crete Products Group............................................................ 13, 57 Pecora Corporation........................................................................ 28, 61 Putzmeister America...................................................................... 11, 57 The Quikrete Companies................................................................. 9, 61 Reef Industries, Inc......................................................................... 37, 63 Schwing America Inc...................................................................... 27, 58 Simpson Strong-Tie Co., Inc.......................................................... 58, 68 Solomon Colors.............................................................................. 43, 64 Somero Enterprises.......................................................................... 2, 63 Stego Industries.............................................................................. 62, 67 The Tailgater......................................................................................... 23 Trinic................................................................................................. 44, 63 US Saws........................................................................................... 31, 64 VoidForm Products, Inc.................................................................. 29, 64 Water Cannon....................................................................................... 48 *Regional ad

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NTRACTORS O C AY W E H T G IN G CHAN SHAPE CONCRETE!

AROUND THE WORLD

At Curb Roller Manufacturing we are proud to be the world leader in shaped concrete roller screeds, producing quality products for everyday concrete work. Our portable, ergonomic machines not only make it easy to shape standard curb, gutter and sidewalks, but also flume, v-gutter, swale and other unique shapes. Let us show you a faster, more efficient way to shape concrete today! www.curbroller.com

785-467-3132

www.forconstructionpros.com/concrete | June/July 2018 | Concrete Contractor 65

6/14/18 1:11 PM

THE LAST PLACEMENT

T

By Brad Humphrey

Why All Construction Companies Should Have a Project Executive

he title, Project Executive, has been used for several years and primarily in the general construction area.

Our Sub-Trade “partners” are just beginning to warm up to the term when they are a major participant on large project.

For the smaller contractor, a Project Executive might also double as the Owner, or perhaps the Project Manager. For the larger contractor, the Project Executive more often represents a more senior Project Manager, although I have found the more experienced Superintendent serving under the title, Project Executive.

But first, let’s discuss some of the components that often make up the role of Project Executive.

Project Experience — in every case that I’ve worked with a Project Executive, he or she was seasoned in their job knowledge, project knowledge, project finances, etc. The Project Executive literally “oozed” with experience. In only a few minutes of discussion one knows, “This person knows what they are talking about.”

Project Leadership — made up from the Project Experience, the Project Executive, or “PX,” is no stranger to having run projects. They are privy to many of the needs of a project leader and can relate to the challenges that confront the Project PM or Superintendent. This experience leverages them to be able to move the Project Leaders to think before acting, plan before executing and prepare before delivering.

Project Financial Master — the

PX must be knowledgeable about how the money moves throughout the life of a project. They are project wise to where questionable expenses are to be accounted and understand how a job may have gone into the “red” and how to turn the job around.

Project “Ambassador” — this may be the most important part of the PX’s role. For any project, the Client wants to know who they need to call if they have a burning question, problem or idea. It is the PX that will often take the hardest complaints from a Client and will be expected to ensure that the Client’s ultimate needs and expectations are met. The other side to being the “Ambassador” is that the PX is also the best representative from the Project Team to their company’s Executive Suite. The PX’s attitude, perspective and insights are invaluable to those whom they report directly to. The President or CEO will take the word of their PX over the word of the Project Manager or Superintendent just about every time.

Project Counselor & Coach — while the Ambassador role might be critical to the Client, the execution of Counselor or Coach, may be the most important to the Project Leaders. This is role can be the differentiator between a Senior PM being considered for the Project Executive role. This person must have demonstrated wisdom over the years when they had younger field leaders under their tutelage. The PX didn’t have to have had a perfect record, but they need to be one that has demonstrated professionalism in both attitude and action.

Project Strategist — part of their coaching function, it is the PX that must instruct their Project Leaders on the importance of staying ahead of the current day. When so many Project Leaders find it easy to get down in the weeds, often missing what is about to come around the corner, it is the PX who must pull them out to balance both the short and longterm perspective. Easier said than done, the PX must impose their will, if needed, if he or she views their Project Leaders getting lost in the weeds or succumbing to the whines and minor emergencies of subcontractors who are failing badly in their own efforts.

The PX must continue to encourage both PM and Superintendent to keep “their eyes downfield.”

A few benefits of having a Project Executive include: 1. Improve the vision of the Project Leaders 2. Drive greater realism on job planning 3. Provide “aid & comfort” to Project Leaders 4. Educate Project Leader on critical, strategic decision making 5. Reinforce company’s culture of professionalism 6. Add to Client Retention Strategy If you have never considered the PX role, consider it to improve your project success and performance profitability.

Ed. Note: Brad Humphrey is President of Pinnacle Development Group. He can be reached at humphrey.brad@gmail.com.

66 Concrete Contractor | June/July 2018 | www.forconstructionpros.com/concrete

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ForConstructionPros.com/10076089

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NEW Stainless-steel Titen HD heavy-duty screw anchor ®

Cracked

Concrete CODE LISTED

The new Simpson Strong-Tie® stainless-steel Titen HD® screw anchor delivers all the benefits of our high-strength Titen HD anchor and can now be installed in exterior and corrosive environments. Its innovative carbon helical-coil thread effectively cuts the concrete while significantly reducing the carbon steel in the anchor to maximize corrosion resistance.

To learn more about the Type 316 stainless-steel Titen HD screw anchor, visit go.strongtie.com/titenhdss or call (800) 999-5099.

Available in 3⁄8", 1⁄2", 5⁄8" and 3⁄4" diameters ForConstructionPros.com/10074628

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© 2018 Simpson Strong-Tie Company Inc. THDSS18

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JOBSITE SOLUTIONS PERFORMANCE MATCHED WORK TOOLS FOR EVERYTHING CONCRETE

Choose from a variety of Cat ® machines, models and attachments for your next project. Whether your crews are breaking concrete, setting forms, backfilling or grading, you’ll get the most out of your equipment with a wide range of attachment options with quick couplers that allow easy changing for faster job completion. That means more work and bigger profits for your business.

To see the full line-up of Cat equipment www.necatdealers.com/bcp

SINCE 1927 Alban CAT

www.albancat.com Baltimore, MD 800-492-6994

SINCE 1948 Cleveland Brothers

www.clevelandbrothers.com Murrysville, PA 844-800-0802

SINCE 1957 Foley, Incorporated www.foleyinc.com Piscataway, NJ 732-885-5555

SINCE 1923 H.O. Penn Machinery www.hopenn.com Poughkeepsie, NY 844-CAT-1923

SINCE 1960 Milton CAT

www.miltoncat.com Milford, MA 866-385-8538

SINCE 1916 Giles & Ransome Inc. www.ransome.com Bensalem, PA 877-RANSOME

© 2017 Caterpillar All rights reserved. CAT, CATERPILLAR, their respective logos, “Caterpillar Yellow,” the “Power Edge” trade dress as well as corporate and product identity used herein, are trademarks of Caterpillar and may not be used without permission. www.cat.com www.caterpillar.com

ForConstructionPros.com/10075307

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