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Stannous sulfate and gypsum mixture as a retarder in grinding portland cement and blended hydraulic cement for improving the quality of the cement, mortar and concrete
Stannous sulfate and gypsum mixture as a retarder in grinding portland cement and blended hydraulic cement for improving the quality of the cement, mortar and concrete
A process for retarding the hardening rate of the portland cement and blended hydraulic cement by grinding from about 0.5 to 5.0 weight percent of stannous sulfate based on the dry weight of cement clinker in substitution a portion of gypsum as normally used to eliminate the possibility of false set occuring in ground cement and also improve their qualities.
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