Cementitious composition with limestone accelerator
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United States of America Patent
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Sep 17, 2002
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app pub date -
Nov 17, 2000
filing date -
Nov 17, 2000
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Abstract
A cementitious composition comprising Portland cement and a finely divided limestone accelerator. The Portland cement has a fineness of at least about 3,200 Blaine. The composition may contain one or more blast furnace slags or pozzolans, such as fly ash or silica fume. When pozzolans or slags are present, the weight ratio of limestone to a mortar mixture of Portland cement, limestone, sand, water, and pozzolans or blast furnace slags, is in the range of about 1.4% to about 5.6%. The finely divided limestone acts as an accelerator, decreasing the initial set time of the resulting composition, and increasing the rate of strength gain.
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