掺矿渣复合水泥基材料硬化浆体中Ca(OH)2含量的变化规律

Change Law of Calcium Hydroxide Content in Hardened Pastes of Composite Cement Based Materials with Slag

采用热重法测试了不同矿渣掺量复合水泥基材料硬化浆体至2a时各龄期的Ca(OH)_2含量,并计算相对于复合水泥基材料中水泥质量分数的Ca(OH)_2含量,形成掺矿渣复合水泥基材料硬化浆体中Ca(OH)_2含量变化规律。研究结果认为矿渣早期反应消耗部分Ca(OH)_2,而后期不再消耗Ca(OH)_2,矿渣反应不同阶段对Ca(OH)_2的消耗是不一致的。因此不能根据早期矿渣反应消耗Ca(OH)_2的量来预估长龄期时掺矿渣复合水泥基材料中Ca(OH)_2的含量。

Content of calcium hydroxide in hardened pastes of composite cement based materials with slag was measured by the method of thermogravimetry at different cured ages to 2years,then relative content of the calcium hydroxide was calculated with respect to cement mass in the composite binder.Then the change law of calcium hydroxide content was obtained in the hardened composite pastes.The obtained results show that calcium hydroxide is consumed by reaction of slag in composite pastes at early age,and no more calcium hydroxide is consumed in the later ages after slag is activated.The consumption of calcium hydroxide is not consistent at different ages by slag reaction.Therefore,it cannot be estimated that the calcium hydroxide content of hardened composite pastes with slag in the later cured ages according to that at early age.