Cementitious composition
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United States of America Patent
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-
Jan 22, 1985
Grant Date -
N/A
app pub date -
Jul 5, 1983
filing date -
Jul 5, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved cementitious composition is the subject of the present invention. The composition comprises 25-60 weight percent cement component. The cement component is 3 to 50 weight per pozzolan. The pozzolan should have a sulfate reactivity factor of no greater than 12 utilizing a function obtained from the Dunstan formula. The composition is 40 to 75 percent by weight alpha gypsum (calcium sulfate hemihydrate). Various additives may be included to enhance the performance of the composition. These include polymer modifiers, a water reducing agent, a set retarding agent and a set accelerating agent.
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