### Analysis of anhydrite gypsum effects on quality of cement

2016-10-25 · percentage of gypsum increased from 4% to 6%, grinding time that are needed to get 3650±50 cm2/g fineness decreased from 50 minutes to 45 minutes. Furthermore, sieve residue of 40 μm rose from 1.8% to 2.9%. On the other hand, when percentage of anhydrite developed from 4% to 6%, grinding time that are needed to get 3650±50 cm2/g