RAPID SETTING CEMENTITIOUS COMPOSITION.

摘要

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.