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portland cement |
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portland cementBinding agent of present-day concrete. It is a finely ground powder made by burning and grinding a limestone mixed with clay or shale. Its inventor, Joseph Aspdin (1799–1855), patented the process in 1824, naming the material for its resemblance to the limestone of the Isle of Portland, England. The cement combines chemically with the water it is mixed with, then hardens and strengthens. |
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The complex will be sculpted out of 3000 tons of coal ash in lieu of Portland Cement, which would reduce greenhouse gasses by 3,000 tons. But one of the few companies speaking out against the Nunez/Pavley bill is Glendora-based California Portland Cement Co. Portland cement consists primarily of four minerals: tricalcium silicate, dicalcium silicate, tricalcium aluminate, and tetracalcium aluminoferrite. |
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portland cement