摘要(Abstract)：
设计在自然空气、相对湿度95%、干湿循环和浸水4种不同环境中的自修复条件,探究它们对水泥砂浆裂缝自愈合的影响;采用光学显微镜观察、超声波脉冲速度以及相对动弹性模量测试手段表征砂浆裂缝在不同环境中的自修复效率,利用热重分析和微观形貌分析研究自愈合产物的类型及作用机理。结果表明:液态水的存在有利于未水化水泥颗粒的继续水化和碳酸钙的结晶沉淀;干湿循环和浸水环境能使宽度约为250μm的裂缝完全愈合,而空气和相对湿度95%的环境中的裂缝愈合效果较差。
关键词(KeyWords)： 自愈合混凝土;砂浆;环境因素;裂缝
基金项目(Foundation): 国家重点研发计划项目(2017YFB0309905)
作者(Author): 马强,单立福,袁连旺,王金邦,范德科,尹润平,周宗辉
DOI: 10.13349/j.cnki.jdxbn.2020.03.005
参考文献(References)：
[1] 王海龙,朱亚鹏,孙晓燕,等.纤维增强水泥基复合材料自愈合性能研究[J].混凝土,2018(2):32-36.
[2] HUANG H,YE G,DAMIDOT D.Characterization and quantification of self-healing behaviors of microcracks due to further hydration in cement paste[J].Cement and Concrete Research,2013,52:71-81.
[3] 孙道胜,陈远远,王爱国,等.自愈合和自修复混凝土的研究进展[J].材料导报,2014,28(6):132-136.
[4] 石宝存,张士萍,孙茜,等.混凝土裂缝自愈合的研究现状及发展[J].江苏建材,2018(5):50-52.
[5] 邢锋,倪卓.微胶囊-玄武岩纤维/水泥自修复复合材料超声波性能[J].混凝土,2015(2):50-55.
[6] 钱春香,罗勉,潘庆峰,等.自修复混凝土中微生物矿化方解石的形成机理[J].硅酸盐学报,2013,41(5):620-626.
[7] JEFFERSON A,JOSEPH C,LARK R,et al.A new system for crack closure of cementitious materials using shrinkable polymers[J].Cement and Concrete Research,2010,40(5):795-801.
[8] QIAN S,ZHOU J,de ROOIJ M R,et al.Self-healing behavior of strain hardening cementitious composites incorporating local waste materials[J].Cement and Concrete Composites,2009,31(9):613-621.
[9] HUANG H L,YE G,QIAN C X,et al.Self-healing in cementitious materials:materials,methods and service conditions[J].Materials & Design,2016,92:499-511.
[10] 刘素瑞,杨久俊,王战忠,等.混凝土自愈合能力环境影响因素研究进展[J].硅酸盐通报,2015,34(10):2851-2856.
[11] 张士萍,刘俊亮.混凝土裂缝自修复技术的研究现状[J].混凝土,2017(6):17-20.
[12] QIAN S Z,ZHOU J,SCHLANGEN E.Influence of curing condition and precracking time on the self-healing behavior of engineered cementitious composites[J].Cement and Concrete Composites,2010,32(9):686-693.
[13] SISOMPHON K,COPUROGLU O,KOENDERS E A B.Effect of exposure conditions on self-healing behavior of strain hardening cementitious composites incorporating various cementitious materials[J].Construction and Building Materials,2013,42:217-224.
[14] YE G,van BREUGEL K,FRAAIJ A L A.Experimental study and numerical simulation on the formation of microstructure in cementitious materials at early age[J].Cement and Concrete Research,2003,33:233-239.
[15] SULEIMAN A R,NEHDI M L.Effect of environmental exposure on autogenous self-healing of cracked cement-based materials[J].Cement and Concrete Research,2018,111:197-208.
