氯盐环境下粉煤灰及矿粉对砂浆性能的影响

主要研究了氯盐环境中掺粉煤灰和矿粉的砂浆性能.通过测试在氯化钠和氯化钙溶液浸泡之后的水泥砂浆的自由氯离子浓度和总氯离子浓度,研究了矿物掺合料对氯离子结合能力的影响,结论表明随着矿物掺合料掺量的增加,砂浆的氯离子结合能力也会提高.基于RCM法检测了砂浆的氯离子扩散系数,结果表明粉煤灰和矿粉均可以提高混凝土的抗氯离子渗透性,并且矿粉对抗氯离子渗透性的改善作用更显著.基于氯盐结晶、氢氧化钙溶出、Friedel's盐角度,分析砂浆孔隙率变化的原因,结论表明氯盐会导致砂浆孔隙率增加,而矿物掺合料则可以减小由氯盐引起的孔隙率增加的作用.

Effect of Fly Ash and Slag on Performance of Mortar Exposed to Chloride Solution

This paper presented the performance of mortar exposed to chloride solution.Effect of mineral admixture on chloride binding capacity was studied through testing the free chloride concentration and total chloride ion concentration of mortar specimens after soaking in sodium chloride solution.The result shows that the chloride binding capacity of mortar is improved with the increase of the content of mineral admixture.Chloride ions diffusion coefficient is measured according to RCM method, and results indicate that both of fly ash and slag can improve the resistance of chloride ions penetration, and the effect of slag on the improvement of chloride ion permeability is more significant.Change of porosity is also deduced based on chloride crystal, dissolution of Ca(OH)2 and Friedel's salt, and it showes porosity increased due to chloride solution, while mineral admixture can diminish this influence.