活性氧化镁对高矿物掺和料水泥基材料固化氯离子能力的影响

研究了活性氧化镁对高掺量矿物掺和料水泥基材料固化氯离子能力的影响，采取活性氧化镁与氧化钙混掺的方法进行试验研究。实验采用自动电位滴定仪测试水泥浆中总氯离子和游离氯离子量，并借助XRD、DTG等分析其物相组成。研究结果表明：在活性氧化镁和氧化钙混掺量为10%的情况下，随着活性氧化镁掺量的增加，浆体的早期强度降低，而后期强度增进率则提高。在活性氧化镁掺量为5%时，浆体的固化氯离子量达到最大。 XRD、DTG等分析表明浆体中产生了C-S-H凝胶、镁铝水滑石和F盐。

Effect of Reactive MgO on Chloride Ion Binding Ability of Cement-Based Materials with High Addition of SCMs

The effect of active MgO on the chloride ion binding ability of cement-based materials with high SCMs addition, and the test was taken by the measure of reactive MgO and CaO mixing. The total and free chloride contents of pastes were tested by automatic potentiometric titrator, and the phase composition of pastes were analyzed by means of XRD, DTG. The experimental results shows that in the case of reactive MgO and CaO mixed content 10%, the early compressive strength of the paste decreased with the increase of reactive MgO content, while the later growth rate of compressive strength increased. With the addition of 5% reactive MgO, the binding of chloride ion content reached the maximum. XRD, DTG and other analysis showed there are C-S-H gel, hydrotalcite and Friede salt in the paste.