半水石膏含量对水泥与外加剂相容性的影响

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

研究了水泥中半水石膏含量变化对水泥与萘系、密胺和脂肪族等五大类减水剂的相容性影响。结果证明,水泥中半水石膏的含量与水泥对外加剂的相容性关系极为密切,且对于每种减水剂均有最佳掺量点。当半水石膏含量占石膏总量25%～50%时,水泥浆体的经时损失变化较小,初始流动度达到最大值。

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.