Rapid setting cementitious composition

Details Rapid setting cementitious composition Rapid setting cementitious composition

C - Chemistry, Metallurgy

04

B

C04B 28/06 (2006.01) C04B 7/02 (2006.01) C04B 11/05 (2006.01) C04B 18/08 (2006.01) C04B 22/06 (2006.01)

Patent

CA 2481273

A rapid setting cementitious composition useful for making cement boards employs an insoluble form of anhydrous calcium sulfate (anhydrite) to accelerate setting and to permit reducing the amount of high alumina cement usage. The rapid setting cementitious composition comprises as a reactive powder blend: (a) 35 to 90 wt% potland cement; (b) 0 to 55 wt% pozzolan; (c) 5 to 15 wt% high alumina cement and (d) 1 to 8 wt% insoluble calcium sulfate anhydrite.

L'invention concerne une composition à base de ciment à prise rapide utile dans la fabrication de panneaux de ciment. Cette composition utilise une forme insoluble de sulfate de calcium anhydre (anhydrite) pour accélérer la prise et permettre une réduction de la quantité de ciment à haute teneur en alumine utilisée.

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