盐冻耦合作用对掺CWCPM混凝土性能的影响及其机理分析

发布时间：2018-01-12 18:24

本文关键词：盐冻耦合作用对掺CWCPM混凝土性能的影响及其机理分析　出处：《江苏大学学报(自然科学版)》2017年06期 　论文类型：期刊论文

【摘要】：为研究建筑垃圾复合粉体材料(CWCPM)掺量、水灰比对小型混凝土预制构件抗冻性能的影响以及小型混凝土预制构件在不同盐溶液质量分数下的冻融损伤规律,借助XRD和压汞试验,对CWCPM改善混凝土抗冻性能的微观机理进行分析.分析结果表明:CWCPM提高了混凝土的抗冻性能,且存在最佳掺量30%;盐冻耦合作用加剧了混凝土的冻融破坏,存在最不利盐溶液质量分数3.5%;CWCPM的掺入降低了混凝土内部Ca(OH)2的含量,改善了混凝土水化产物组成细化了混凝土内部孔结构,降低了孔隙水的渗透和结冰速率,减小了孔隙内部静水压力和渗透压,宏观上表现为抗冻性能得到提高.
[Abstract]:In order to study the content of CWCPM, a composite powder material of construction waste. The effect of water-cement ratio on the freezing resistance of small concrete prefabricated members and the freeze-thaw damage law of small concrete prefabricated members under different salt solution mass fraction were studied by XRD and mercury injection test. The microcosmic mechanism of CWCPM to improve the frost resistance of concrete is analyzed. The results show that CWCPM can improve the frost resistance of concrete, and there is an optimum content of 30%. The coupling effect of salt and freezing intensifies the freezing and thawing failure of concrete, and the mass fraction of the most unfavorable salt solution is 3.5. The incorporation of CWCPM reduces the content of Ca(OH)2 in concrete, improves the composition of hydration products and refines the pore structure of concrete, and reduces the permeability and freezing rate of pore water. The pore internal hydrostatic pressure and osmotic pressure are reduced, and the frost resistance is improved macroscopically.
【作者单位】：长安大学特殊地区公路工程教育部重点实验室;西安建筑科技大学材料科学与工程学院;
【基金】：交通运输部建设科技项目(2013318J16490) 中央高校基本科研业务费专项资金资助项目(310821165012)
【分类号】：TU528
【正文快照】： 引文格式:薛翠真,申爱琴,郭寅川,等.盐冻耦合作用对掺CWCPM混凝土性能的影响及其机理分析[J].江苏大学学报(自然科学版),2017,38(6):713-718.建筑垃圾已成为继工业和城市生活垃圾之后的又一大病害[1].我国建筑垃圾废砖约占建筑垃圾总量的40%,如何将建筑垃圾废砖进行再生利用已

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