复合矿物掺和料对混凝土工作性的影响

Effects of Compound Mineral Admixture on Workability of Concrete

研究了不同掺加比例的粉煤灰和矿渣所组成的复合矿物掺和料混凝土拌和物的坍落度及泌水率.结果表明:随着矿物掺和料总量的掺加,混凝土拌和物的坍落度损失率减少,并且矿物掺和料掺量在40%,粉煤灰与矿渣的比例为1∶1时,混凝土的坍落度损失速率达到最低,60min的坍落度损失率较对比混凝土降低了约50%.矿物掺和料掺量为30%,粉煤灰与矿渣的比例为1∶1时,混凝土拌和物的压力泌水率降低为对比混凝土的57%.说明适当的矿物掺和料掺量和比例可以改善混凝土的工作性.

This paper investigates the slump and bleeding of fresh concrete mixture with compound mineral admixture which are composed of different propotion of fly ash and slag. The results show that slump loss ratio of concrete mixture decrease with adding amount of admixture. The slump loss ratio of concrete mixture which was added by 40% admixture and fly ash-slag ratio of 1 is half of that of control concrete mixture, the lowest among all the specimens. At the addition of 30% admixture and fly ash-slag ratio of 1, pressured bleeding ratio is the lowest, 57% of one of control concrete. Therefore, proper adding content and mix ratio of admixture may improve workability of fresh concrete mixture.