渗透结晶材料对混凝土裂缝自愈合的影响

Influence of Permeable Crystallization Material on Concrete Crack Self-healing

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。

Permeable crystallization material was incorporated in concretes with and without fly ash and slag. Ordinary concrete without permeable crystallization material was also prepared for comparison.Influence of permeable crystallization material on concrete crack self-healing was investigated by crack depth test,strength recovery test and impermeability recovery test. The self-healing hydration was analyzed by SEM-EDS. The results show that concrete crack self-healing is significantly improved by permeable crystallization material. With the incorporation of permeable crystallization material,the crack depth can be decreased while the strength and impermeability recovery rate can be increased obviously.For concretes with fly ash and slag,the improvement effect is much more obvious. The reason of the improvement is that permeable crystallization material can promote the formation and enrichment of Calcium Silicate（ Aluminate） Hydrate at crack zone.