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which leads to hardening

Substituting recycled glass powder for 20% of the Portland cement in concrete can im- prove concrete’s mechanical performance, say researchers at Clarkson University’s Center for Advanced Materials Processing.

Researchers have previously blended other kinds of crushed or powdered glass with cement, but no one had analyzed or tested the possibili- ties of adding the byproduct from industrial bead manufacturing. Glass powder is effective in concrete primarily because it is loaded with silica, which can react with other cement components (calcium hydroxide, for example) to increase the material’s strength through hydration (which leads to hardening). Narayana Neithalath, Clarkson University, Potsdam, NY 13699; 315/268-1261;

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