Cementitious composition

Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...

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Details

106 98, 106110, 106111, 106117, C04B 735

Patent

active

044949901

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.

REFERENCES:
patent: 1255236 (1918-02-01), Schweimler et al.
patent: 2362060 (1944-11-01), Etridge et al.
patent: 3411924 (1968-11-01), Lapshin
patent: 3565648 (1971-02-01), Mori et al.
patent: 3582376 (1971-06-01), Ames
patent: 3847635 (1974-11-01), Lange et al.
patent: 4067939 (1978-01-01), Lowe et al.

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