Anhydrite or anhydrous calcium sulfate (CaSO4) is an important naturally-occurring compound found in many limestone formations and karst topography. This material has recently gained more significance to the cement industry as a substitute for gypsum—calcium sulfate dihydrate (CaSO4·2H2O). Anhydrite shows great efficacy as a cement setting retardant. This allows valuable time for other phases to form which enhances the cement’s tensile properties.
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