Non-expansive, rapid setting cement
AssigneeUnited States Gypsum Company
InventorsRichard E. Galer, Paul C. Webb
Life of this patent
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Abstract
An ettringite-producing hydraulic cement especially adapted to the high speed production of carbon dioxide resistant cement board produces essentially all of its potential ettringite within about 20 minutes after it is mixed with water. The cement is non-expansive and sets within about 25 minutes at a temperature of from about 65.degree. F. to about 150.degree. F.
Claims9
A non-expansive, ettringite-producing hydraulic cement which produces a cementitious product which is resistant to carbon dioxide attack, is stable at high temperatures and has a high early strength, said hydraulic cement comprising from about 72% to about 80% portland cement, from about 14% to about 21% high alumina cement, from about 3.5% to about 10% calcium sulfate and from about 0.4% to about 0.7% hydrated lime, by weight.
A non-expansive, ettringite-containing cementitious composition comprising the hydration products of a hydraulic cement comprising from about 72% to about 80% portland cement, from about 14% to about 21% high alumina cement, from about 3.5% to about 10% calcium sulfate and from about 0.4% to about 0.7% hydrated lime, by weight.
Dependencies are inferred from the claim text.