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Effect of semi-hydrated gypsum content of Portland cement on compatibility of cement and admixture

ZHENG Qiang,YANG Liu,MA Chuan-jie Shanshui Cement Group Co.,Ltd.Jinan 250307,Shandong,China  
The effect of semi-hydrated gypsum content on compatibility of cement and water reducer such as naphthalene series,melamine,aliphatic and so on was studied.The result showed that the semi-hydrated gypsum content influenced the compatibility of cement and admixture seriously,and all of the admixtures had a best dosage in cement.When the content of semi-hydrated gypsum in the total less of cement paste was less while the intital fluidity reached the most.
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