渗透结晶材料对混凝土裂缝自愈合的影响

发布时间：2018-05-14 10:50

本文选题：渗透结晶材料 + 裂缝自愈合　；参考：《硅酸盐通报》2017年10期

【摘要】：通过在纯水泥混凝土和粉煤灰、矿粉混凝土中掺入渗透结晶材料制备不同混凝土,同时制备基准混凝土,分别采用裂缝深度观测、强度恢复测试、抗渗恢复测试研究渗透结晶材料对混凝土裂缝自愈合的影响,并采用SEMEDS分析愈合产物。试验结果表明,渗透结晶材料可以显著改善混凝土的裂缝自愈合效果,降低开裂混凝土裂缝深度,提高混凝土强度恢复率和抗渗恢复率。对于掺渗透结晶材料的粉煤灰、矿粉混凝土,裂缝自愈合效果更优。渗透结晶材料促进了水化硅铝酸钙在裂缝处的生成和富集,从而起到促进裂缝自愈合的作用。
[Abstract]:Different kinds of concrete were prepared by adding permeable crystalline materials into pure cement concrete, fly ash and mineral powder concrete, and benchmark concrete was prepared at the same time. Crack depth observation and strength recovery test were used respectively. The effect of permeable crystalline materials on the self-healing of concrete cracks was studied by anti-seepage recovery test, and the healing products were analyzed by SEMEDS. The experimental results show that the permeable crystalline material can significantly improve the self-healing effect of concrete cracks, reduce the crack depth of cracked concrete, and improve the recovery rate of strength and impermeability of concrete. The effect of crack self-healing is better for fly ash and mineral powder concrete mixed with permeable crystalline material. The permeable crystalline material promotes the formation and enrichment of calcium silicate hydrate at the fracture, thus promoting the self-healing of the fracture.
【作者单位】：中交四航工程研究院有限公司;水工构造物耐久性技术交通运输行业重点实验室;
【基金】：交通运输部应用基础研究项目(2013329765250)
【分类号】：TU528

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