不同种类石膏对石膏矿渣水泥性能影响研究OA

Anhydrite desulphurization gypsum and phosphogypsum with granulated blast furnace slag and a small amount of cement were used to prepare gypsum-slag cement,and analyze its mechanism of action.The results show that the fluidity of slag cement mixed with anhydrite is the best and the setting time is the shortest,followed by desulphurization gypsum,the fluidity of slag cement mixed with phosphogypsum is the worst and the setting time is the longest.The slag cement with anhydrite has the lowest 3 d compressive strength at the early stage,followed by phosphogypsum,and the slag cement with desulphurization gypsum has the highest 3 d compressive strength.The 28 d compressive strength of slag cement mixed with anhydrite is the highest,followed by desulphurization gypsum,phosphogypsum is the lowest.These properties are relat-ed to the purity,solubility and harmful substances in gypsum.