Concrete Products

JUL 2019

Concrete Products covers the issues that attract producers of ready mixed and manufactured concrete focusing on equipment and material technology, market development and management topics.

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Page 43 of 103

42 • July 2019 The Megaslab Jointless Concrete System is equal to significantly more demanding conditions than its premier commercial installation. The Foundation Technologies site, however, affords Sinclair a good case for use with tilt-up concrete construction, where the slab on grade must be finished before the enclosure is erected. Projects involv- ing precast concrete or concrete masonry walls, or metal building systems, typically see post-enclosure slab construction—the shelter affording a better concrete placing and finishing environment, plus greater schedule flexibility. "The conditions at the Lawrenceville site were not ideal," Adams affirms. "We had very measurable rainfall leading into the spring season and were testing slab placement in an exposed setting. Many Megaslab candidate projects will have better conditions than what we encountered with Foundation Technologies." The 6-in. thick warehouse and loading dock Megaslabs were placed with Somero 22EZ laser screeds and Whiteman riding trowels. Crews used bullfloats on early sections, but found the laser screed results alone sufficient for power troweling. Ready mixed concrete for the warehouse and dock pours was supplied from the Thomas Concrete Lawrenceville plant, where a small shop enabled Sinclair to stage Megaslab additive vessels and dosing. Beyond the Founda- tion Technologies warehouse, Sinclair has conferred with slab on grade practitioners and owners outside the Southeast, including state department of transportation representatives. Teaming with Adams on Megaslab mix design and field practice guideline development is Sylvester Schmidt, a veteran of (pre-Cemex) RMC Industries, Atlanta, plus HeidelbergCement operations in North America and Europe. "I have always found joints and cracks, as well as other shrinkage related problems, to be a serious concern for industrial and commercial concrete floors," he says. "It's not only a cosmetic problem since joint maintenance and repairs are continu- ous cost factors for a facility owner. Megaslab presents a true, solid technical solution to these problems along with other substantial quality improvements." — Sinclair Construction Group, Marietta, Ga., COVER STORY BY DON MARSH After establishing Sinclair Construction Group in the post-recession Atlanta market, founder Jason Adams sought a departure from commercial concrete work. He oversaw the principal casting elements—mainly hyperbolic paraboloid shells—of Stealth, a 36-ft. high monolithic sculpture in downtown Atlanta. The structure features precise edges, lustrous surfaces, and twisted forms, and is made of a black polished conventionally reinforced concrete with macro fibers. Stealth earned the American Concrete Institute Atlanta Chapter second place recognition in the Decorative category of ACI's 2016 Excellence in Concrete Construction Awards. STEALTH: A SURFACE IN SPACE

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