WIRTGEN SP 62i Slipform Paver

SECTIONPaving Pages 29-43

For more information on paving, compaction and milling equipment, as well as comparison charts, visit CEG's Web site at www.constructionequipmentguide.com. Caterpillar Provides Updates to Large Asphalt Paver Line

Caterpillar Inc. announced updates to the large asphalt paver line. The new Cat AP600, AP655, AP1000 and AP1055 asphalt pavers build upon the performance of the F-series pavers that brought fuel efficiency, simplified operation and more comfort.

With new screed offerings, technology that assists with paver setup, better material retention and enhanced visibility with standard opposite side mirrors, these new models continue to evolve into machines that offer contractors a high return on investment, according to the manufacturer.

Front-Extender Screed Additions

The new Cat SE47 FM and SE60 FM screeds utilize extenders located in front of the main screed. These front-mounted extenders are extremely stable for wider width paving and make it easy to quickly reduce paving widths when maneuvering around obstacles by easily drawing material back into the auger chamber.

The SE47 FM offers a paving range of 8ft. to 20-ft. 6-in., while the SE60 FM provides a 10-ft. to 25-ft. 6.-in paving range. Optional extension packages as well as berm attachments enable these screeds to perform exceptionally well in a variety of applications in both urban and rural settings.

Simple Setup, Repeatable Performance

Pave start assistant is an optional machine management tool that simplifies setup for repeatable performance on job sites with similar paving requirements.

The integrated system records the functioning conditions of both the paver and screed including paving width, paving speed, and tow-point position to name a few. When moving to a similar job site, the operator simply activates a previously recorded profile from the display menu, and the system conveniently matches machine setup specifications for proven, reliable performance.

This option is available on the SE50 V, SE50 VT, SE60 V, SE60 V XW and SE60 VT XW screeds.

Material Monitoring

Monitoring asphalt in the hopper is a vital function for keeping the paving train running smoothly. However, at times it can be a difficult task. Too much material results in spillage, while too little material starves the feed system.

Too simplify this function, an optional sensor has been added for material height with an indicator located on the operating display that enables the operator to quickly determine when to continue paving or when to call for more material. In combination with the height sensor is an optional temperature sensor that keeps the operator informed of the asphalt temperatures being delivered to the paver for a convenient quality control process check.

The new Cat AP600, AP655, AP1000 and AP1055 asphalt pavers build upon the performance of the F-series pavers. Thermal Mapping

Thermal segregation is one of the leading causes of road failure in the asphalt paving industry. Thermal variations can leave uneven surface textures behind the screed. These variations cool more quickly and can lead to less-than-ideal compaction results and shorter life expectancy of the paved surface.

Early detection of thermal variation enables timely process control adjustments to be made. To combat these variations, contractors can monitor asphalt surface temperatures utilizing the optional Cat infrared camera and a Global Navigation Satellite System (GNSS) enabled by RTK accuracy. Viewing real-time temperatures, contractors can identify variations and take action to manage the plant-to-paver delivery process and fine-tune paving practices for more uniform lay-down temperatures.

Enhanced Material Retention

Paver and truck exchanges provide an opportunity for asphalt spills and leaks. A new flashing design on the front of the hopper offers increased memory and temperature resiliency that helps provide better spill prevention. In addition, scrapers located on the backside of the hopper help prevent leaks between the hopper wings and engine compartment.

New Styling

New trade dress provides a distinguished appearance that helps keep the machine fleet looking modern and up to date. The letter designation also has been removed and will follow serial number recognition for parts and service support.

For more information, visit www.cat.com.

A Wirtgen slipform paver constructed 89,700 sq. yds. of operational facilities by concrete paving an extension of the apron and a hazardous cargo pad at the military air base on the international airport at the port of Keflavik, about 31 mi. from Iceland’s capital, Reykjavik.

As the overall project was commissioned by the U.S. government, all measurements used during the paving project were in imperial units.

At the end of the construction project the SP 62i had paved a total of 45,778 cu. yd. of single-layer concrete paving with a width of 25 ft. and a thickness of between 16 and 18 in. On average, 1,177 cu. yds. of concrete were paved every day.

Highest Quality, Despite

Challenging Deadline

Due to the climatic conditions on the Reykjanesskagi peninsula in the south west of Iceland, the time window for the project was set for the beginning of July to the end of September of the year. To squeeze the work into this timeframe, the decision was made to do without prior placement of fixed formwork for the individual strips.

Despite the tight deadline, the paving team was able to deliver highest quality results, not least due to machine technology like the high-precision steering and leveling system and the automatic super smoother.

Precise Edges Essential for Optimal Surface Water Drainage

Operational areas on airfields generally have only a very slight cross-slope and, in Keflavik, the specified value was 1 percent.

The area was paved in 31 separate strips that were connected to one another by tie bars inserted along the sides to ensure the correct height of the individual sections. The outer edges of the strips posed a particular challenge for paving with the slipform method. They had to be precisely perpendicular from end to end and faultlessly paved with absolutely no fall.

Only this can ensure that rainwater drains away as it should during future operations, and that no water collects in the expansion joints.

At Keflavik Air Base, the Wirtgen SP 62i delivered precise single-layer concrete paving with a width of 25 ft. and a thickness of between 16 and 18 in.

Wirtgen Application Engineers Provide Assistance

Essentially, concrete is always a mixture of cement, water and variously sized aggregates. However, in order to fulfill the future load-bearing and wear-resistance properties of the construction in question, further additives and a more precise consideration of the above-mentioned main ingredients was needed.

The required properties in the case of the extension work at Keflavik Air Base included, for example, a concrete with the compressive strength class C35/45. In order to achieve the desired compressive strength of 45 N/mm² (cubic concrete specimen), the ideal formula for the concrete mix was determined with the assistance of Wirtgen application engineers and optimized for paving with the slipform paver.

In situ paving of the first pilot strips was able to begin immediately without trial areas. These showed optimum quality in all specified parameters such as density, compressive strength, profile-compliant placement and surface roughness, i.e. grip characteristics.

Maximum Evenness Over

Entire Operational Area

When it comes to the operational areas of airfields and airports, demands for surface evenness are generally very high. At Keflavik Air Base, the specified maximum permissible unevenness was .15 in. on 13 ft. In reality, the evenness measured according to TP Eben 2007* showed that deviations were significantly lower and that the evenness achieved was far better than the target value. * Technical testing regulations for evenness measurements on road surfaces in longitudinal and transverse directions. A clear sign of the quality that can be achieved only with a perfectly coordinated team and the right equipment, as Hendrik Wendt, Site Manager & Concrete Technologist, HIB Infra GmbH & Co. KG subsequently explained: “On this project, we once again enjoyed the excellent experience of working together with the team from Wirtgen.

“The team provided excellent advice and valuable support in both the planning phase and as on-site consultants. Not least thanks to this, we were able to complete the project on time with as good as no problems at all on the construction site.”

Facts, Figures:

Extension Project at Keflavik Air Base

Project Dimensions

• Parking apron length: 918 ft.; • Parking apron width: 771 ft.; • Hazardous cargo pad length: 394 ft.; • Hazardous cargo pad width: 249 ft.

Paving Data

• Specified cross-slope: ≤ 1 percent; • Paving width: 25 ft.; • Paving thickness: 16 to 18 in.; • Daily paving performance: 1,177 cu. yds.; • Overall paved surface area: approximately 89,700 sq. yds.

General

• Construction contractor: HIB Iceland

Ehf; • Project timeframe: 07–09/202;1 • Wirtgen machines deployed: SP 62i.

For more information, visit www.wirtgengroup.com. 

“Teamwork is an essential factor when it comes to assuring our success. And that is why we truly appreciate the value our long-established partnership with the Wirtgen Group. Product management, application engineers, and service teams on the construction site work hand-in-hand with us, always with a single goal in mind: finding the right solutions to ensure the success of our project,” said Matthias Neumann, CEO, HIB Infra GmbH & Co. KG.

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