Launch Slideshow

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TCP's 2009 Greensite Awards

TCP's 2009 Greensite Awards

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    Molin Concrete's campus lies within the Rice Creek Watershed District. As part of the project, the producer restored and enhanced an existing wetland area with native vegetation.

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    Crews used a 154-ton, self-jacking tower crane to erect structural steel, and placed most of the concrete with a 92-foot placing boom and pump. A 99-ton crane and two hydraulic booms were dedicated to onsite rebar prefab and installation.

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    The building's green features include a water-based in-floor radiant heat system with a boiler that uses waste oil from fleet vehicles.

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    The Glendale Park & Ride has been recognized for its pervious concrete, which reduces water runoff and urban heat island effect.

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    In addition to environmental benefits, pervious concrete can reduce hydroplaning by preventing water from pooling on paved surfaces.

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    The Academy's hallmark 2.5-acre “live roof,” with iconic rolling hills, provides a layer of thermal insulation for the building.

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    Concrete was economical and added green features to The Encore on 7th, an 18-story retail and residential building in downtown Pittsburgh.

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    The Primrose at Landfall is the first LEED Platinum home in Wilmington, N.C. It uses less energy and water and has a smaller carbon footprint than other homes its size.

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Institutional

California Academy of Sciences / San Francisco

After being damaged by an earthquake in 1989, the California Academy of Sciences needed a new home. Sustainability and conservation have been part of the Academy's history for more than 150 years, so the new building had to exemplify environmentally superior construction.

The new LEED Platinum facility integrates architecture and landscape, and helps set a new standard for energy efficiency and environmentally responsible systems in a public building. Concrete provided a solution for many critical applications in the Academy's unique design.

Compactor shelves, designed to hold collections of various research materials, ride on rails for ease of accessibility and required deflection criteria only achievable with reinforced concrete. The aquarium tanks designed with complex geometries could only be cast in concrete.

Concrete also played an integral part of the building's mechanical system and served as a thermal massing element. As one of the more abundant construction materials, it was important to choose mixes that were environmentally friendly, performed well, and durable.

All concrete mixes needed to use sustainable materials and meet an ultra-low shrinkage requirement for the aquarium tanks. Cast architectural concrete—the primary finish of the interior hallway walls—needed to deliver a perfect as-cast architectural finish. Central Concrete Supply, a U.S. Concrete division, provided 35,000 yards of concrete, utilizing environmentally friendly technology (EF Technology).

The concrete mixes consisted of 50% portland cement and 50% supplementary cementitious materials, such as fly ash and slag-reclaimed byproducts. By using EF Technology mixes, the producer prevented 9.2 million pounds of CO2 emissions from entering the environment. Using fly ash and slag, as well as regionally extracted supplies of aggregates in the concrete greatly contributed to earning the highest LEED rating.