水胶比及矿物掺和料对净浆塑性收缩影响

Influences of water-binder ratios & admixtures on the Plastic Shrinkage of Blended Cement Paste

采用自行设计测定塑性收缩的方法,对不同胶凝材料净浆在不同水胶比情况下的塑性收缩变化规律及矿物掺和料对塑性收缩的影响进行了研究.试验结果表明,净浆塑性收缩与水胶比有关;水胶比为0.28～0.35时,塑性收缩随水胶比的增加而减小,而在0.35～0.45范围内随水胶比的增加而增加;矿物掺和料的品种及掺量对净浆的塑性收缩也有很大的影响.

In this work, the effect of water - binder ratios （w/b） and amount of admixture on the plastic shrinkage of blended cement paste were investigated. The test results indicate that different water-binder ratios show different effects on the plastic shrinkage. The plastic shrinkage decreases with the increase of water - binder ratios between 0.28 and 0.35, while increases for the ratios from 0.35 to 0.45. The amount and the kind of admixture could also impose on the plastic shrinkage.