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Post-EPA rule fly ash consumption eclipses pre-recession level

The volume of coal fly ash used in concrete production increased to 13.1 million tons in 2014, exceeding the 12.6 million ton utilization mark set in 2008, according to the American Coal Ash Association’s (ACAA) “Production and Use Survey,” released in late 2015. Increases in the use of synthetic gypsum from power plant emissions control equipment also helped to push the recycling rate for all types of coal combustion products (CCP) to a record 48 percent.

Read more: Post-EPA rule fly ash consumption eclipses pre-recession level

Major Boeing grant reinforces heavy-duty permeable pavement research

30 Fiber 150Aerospace giant Boeing Co. is teaming with Washington State University (WSU), and the Washington Stormwater Center to develop stronger permeable concrete or asphalt pavement through the use of carbon fiber composite material recycled from a Seattle aircraft assembly line. A $212,000 grant and material donation is funding investigations at the WSU Research and Extension Center, Puyallup, and WSU Pullman campus.

 

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Research raises questions on minimum CM specs, supports paste-to-void ratio rationale

A recent report on results of concrete mixtures testing at National Ready Mixed Concrete Association’s College Park, Md., research laboratory underscores optimized cement paste volume and paste-to-void ratio as key factors behind fresh and hardened specimens’ improved performance characteristics.

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Jointless, cut-free PrimeComposite slab makes 182,000-sq.-ft. debut

28 Jointless 150Schaumburg, Ill.-based Rabine Group, a specialist in high performance slabs on grade and specialty concrete pavement, reports the first North American installation of the PrimeComposite Concrete Flooring System, combining proprietary finishing methods plus mixes rich in admixtures and steel fibers. As the foundation of a Lakeville, Minn., metalworking facility, the 6-in. thick, 182,000-sq.-ft. slab was finished in late-summer 2015, free of control joints and saw cuts. Following a 14-day cure, owner BTD Manufacturing Inc.—a component fabricator for Caterpillar, Cummins, Daimler, Deere, Terex and other heavy equipment manufacturers—placed the facility in service.

 

Read more: Jointless, cut-free PrimeComposite slab makes 182,000-sq.-ft. debut

Capitol Aggregates logs first NRMCA-certified EPD for portland cement

26 EPD 150The National Ready Mixed Concrete Association has certified its inaugural Environmental Product Declaration (EPD) for cement in North America, covering ASTM C150 Types I and III, C595 Types IP and IL, and C91 Types N and S from Capitol Aggregates’ flagship mill in San Antonio, Texas. The EPD for Capitol Aggregates, a long-time NRMCA member serving the Texas market for nearly 60 years, follows a September 2015 milestone when the association certified its 2,000th concrete declaration. That watermark is by far the most of any building material or product category represented in EPDs targeted to new green building rating system requirements.

Read more: Capitol Aggregates logs first NRMCA-certified EPD for portland cement