Salt River plant receives Energy Star label

As 2010 was winding down, the Salt River Materials Group Phoenix cement plant in Clarkdale, Ariz., was recently honored with the U.S. Environmental Protection Agency (EPA) Energy Star label for 2010. The plant had received its first label in 2007 and has been labeled every year thereafter.

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MIT: Operation accounts for lion’s share of structures’ CO2 emissions

Preliminary findings from Concrete Sustainability Hub research aimed at a new life-cycle assessment (LCA) model suggest that service phase encompasses 85% and 90% of carbon dioxide emissions, respectively, from highway pavements and residential buildings. Ongoing studies at the MIT-hosted Hub will quantify paving and building materials’ cradle-to-grave environmental costs, yielding what staff contends is the most comprehensive LCA model to date.

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Five Holcim plants earn EPA's Energy Star

Holcim (US) Inc. announced recently that for the third consecutive year, its Devil’s Slide plant in Morgan, Utah and the plant in Theodore, Ala., have earned the U.S. Environmental Protection Agency's (EPA) Energy Star. In addition, the newly commissioned Ste. Genevieve plant in Bloomsdale, Mo., the Trident plant in Three Forks, Mont., and the plant in Holly Hill, S.C. were first-time recipients of the award.

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Technology shears cost of processing fly ash to match silica fume performance

A New York investor announced, at 2011 World of Concrete last month in Las Vegas, an industrial-scale process economizing the grinding of fly ash, or secondary grinding of ground granulated blast furnace slag or portland cement, to 6-, 3- or 1-micron median particle sizes. With $30 to $75 per ton processing plus $20 to $100 per ton raw feed (fly ash, GGBF cement or Type I/II portland cement) costs, the technology can yield premium binding agents whose performance properties in finished concrete and grouts match those of ultra-fine, high-reactivity metakaolin or silica fume—typically commanding $300 to $700 per ton.

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