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ultrafine grinding of cement

Oct 12, 2008 · Properties of concrete containing ultrafine RHA. The consistency (slump) of the reference concrete is reduced from 130 to 100 mm, 60 mm, and 20 mm, respectively, when 10%, 15% and 20% of ultrafine RHA is used as cement replacement. This decreasing in slump value occurs due to the high specific surface area and high-carbon content of the RHA

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