基于不同阳离子条件下硅酸盐水泥氯离子固化性能研究

发布时间：2018-05-16 23:09

本文选题：硅酸盐水泥 + 阳离子　；参考：《硅酸盐通报》2016年09期

【摘要】：研究了不同阳离子对硅酸盐水泥氯离子固化性能的影响,采用水溶法测定了净浆试样中自由氯离子的含量并计算出其氯离子固化率,对试样进行了XRD物相分析以及其水溶液的p H值测定。研究得出,随水化龄期的增长,水泥浆体的氯离子固化率增大,其6 h、12 h、1 d和3 d的氯离子固化率分别达到其28 d的50%、70%、80%和90%以上,F盐的生成及氯离子的固化主要发生在水化早期,水化后期氯离子固化主要来自C-S-H凝胶,其氯离子固化量较小。不同阳离子导致了水泥浆体中F盐生成量的差异,其影响硅酸盐水泥氯离子固化率由大到小排列为Ca2+Mg2+K~+Na~+,其与对p H值的影响成负相关系,Ca2+和Mg2+降低了水泥浆体的p H值,有助于氯离子的固化;K~+和Na~+提高了水泥浆体的p H值而降低了氯离子固化。氯离子浓度一定时,Na~+浓度的增加对水泥浆体中F盐的生成量及氯离子固化率影响不大;而Mg~(2+)浓度的增加提高了水泥浆体中F盐的生成量及氯离子固化率。
[Abstract]:The effect of different cations on the curing properties of Portland cement chloride ion was studied. The free chloride ion content in the sample was determined by water solution method and the curing rate of chlorine ion was calculated. The phase analysis of XRD and the determination of pH value in aqueous solution of the sample were carried out. The results show that with the increase of hydration age, the solidification rate of chloride ions in cement paste increases. The curing rates of chloride ions at 6 h / 12 h / d and 3 d were 50% and 90%, respectively, of 28 days. The formation of F salts and the curing of chloride ions mainly occurred in the early stage of hydration. In the latter stage of hydration, the chloride ion solidification mainly came from C-S-H gel, and the amount of chloride ion solidified was relatively small. Different cations lead to the difference of F salt production in cement paste, which affects the solidification rate of chloride ions in Portland cement from large to small to Ca2 Mg2 K ~ Na ~, which is negatively correlated with the influence on pH value. The Ca 2 + and Mg2 decrease the pH value of cement paste. It is helpful to increase the pH value of cement paste and decrease the solidification of chloride ion. The increase of sodium chloride concentration has little effect on the formation of F salt and the solidification rate of chloride ion in cement paste, while the increase of Mg~(2 concentration increases the formation amount of F salt and the solidification rate of chloride ion in cement paste.
【作者单位】：中南大学土木工程学院;
【基金】：国家自然科学基金(51278497)
【分类号】：TQ172.1

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