MICROSTRUCTURE-BASED KINETICS MODEL

MICROSTRUCTURE-BASED KINETICS MODEL

A November 2013 CSHub research profile letter, “Early hydration: A local business,” charts calorimetry (heat measurement) curves from tricalcium silicate paste experiments—with specimens of three particle size distributions (PSD)—to support a proposed model of microstructure-based kinetics. It suggests a “reaction zone” extending a few micrometers in from the cement particle surface, and can reconcile longtime observations on PSD and water/cement ratio.

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Pervious, RCC admixtures mark chemical giant Momentive’s concrete entry

Source: Momentive Specialty Chemicals, Inc., Columbus, Ohio; CP staff

A company formed in late-2010 from Momentive Performance Materials and Hexion Specialty Chemicals—successors to GE Silicones and Borden Chemical—debuted its HexiCrete product line for producers and contractors at World of Concrete (January 18–21, Las Vegas). Charter offerings are pervious and roller compacted concrete admixtures, zero-VOC Type I & II curing compounds, and a penetrating sealer.

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