Concrete Products

APR 2012

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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FINAL FORM PRECAST Natural-stone look comes to precast sports stadiums The co-winners of the 2011 Precast/Prestressed Concrete Insti- tute's (PCI) Design Awards for the Stadiums/Arenas/Sports Fa- cilities category showcase how skilled, creative precasting crews can mimic natural stone. Both projects, Target Field (home of the Minnesota Twins) and the Indiana University Stadium's north end zone addition, demon- strate stone-like effects by use of form liners or by actually casting in odd-size limestone blocks. Various thicknesses of honed and quarry creek rock-faced stone were cast into the precast concrete wall system for Target Field. However, casting in odd-size limestone blocks with non-uniform surfaces and thickness (varying by up to 2 in.) presented a major challenge. Solution: The limestone blocks were placed face down in the precast form with 3/4-in. joints, and stainless steel ties were used to anchor the blocks to the precast. A bond breaker prevented concrete from entering the joints and allowed thermal expansion of the dissimilar materials. The stadium design also included a gradation in stone color from darker stone at the base to lighter at the top. Furthermore, the structure consisted of a multi-level waffle slab floor system with concrete columns at random locations. For the Indiana University Stadium addition, precast concrete Target Field was awarded LEED Silver Certification by the U.S. Green Building Council, only the second LEED-certified professional sports stadium in the United States, after Nationals Park, home of the Washington Nationals. form liners were used to impart a split-faced limestone-like texture to emulate giant blocks of quarry limestone. The form liners were created by tak- ing impressions from lime- stone blocks. Bands of smooth-faced precast were integrated with the tex- tured areas to help articulate the look of individual stone blocks. The corners of the towers feature panels poured with an invisible cold formed joint at the outside corner, allowing significant depth to each leg and further creating the illusion of large stone blocks to coordinate with the collegiate gothic limestone architecture of the academic campus. Cast into the architectural panels is a one- story tall IU niversity logo. Moreover, the university's name is also cast into the panels with an incised font. PROJECT: Indiana University Stadium North End Zone Addition LOCATION: Bloomington, Ind. ARCHITECT: RATIO Architects Inc., Indianapolis, Ind. ENGINEER: Fink, Roberts & Petrie Inc., Indianapolis, Ind. CONTRACTOR: Pepper Construction of Indiana, LLC, Indianapolis, Ind. PRECASTER: Gate Precast Co., Winchester, Ky. 48 | APRIL 2012 PROJECT: Target Field (Minnesota Twins) LOCATION: Minneapolis, Minn. ARCHITECT: Populous, Kansas City, Mo. CONTRACTOR: Mortenson Construction, Minneapolis, Minn. PRECASTER: Gage Brothers Concrete Products Inc., Sioux Falls, S.D. WWW.CONCRETEPRODUCTS.COM

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