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养护环境对掺有氧化镁膨胀剂的应变硬化水泥基复合材料裂缝自愈合的影响
作者: 鹏1 2 戴雨晴1 高凯凯1 王文涛1 赵铁军1 2 
单位:(1. 青岛理工大学土木工程学院 山东 青岛 266033 2. 青岛理工大学 山东省蓝色经济区工程建设与安全协同创新中心 山东 青岛 266033) 
关键词:氧化镁膨胀剂 应变硬化水泥基复合材料 养护环境 自愈合 裂缝 
分类号:TU528.57
出版年,卷(期):页码:2019,47(11):0-0
DOI:
摘要:

 用四点弯曲试验对掺有氧化镁膨胀剂(MEA)的应变硬化水泥基复合材料(SHCC)试件(SHCC-MEA)加载诱导产生裂缝,通过在不同养护时间测量其裂缝宽度以及毛细吸水量,研究了干燥(RH 50%)、水雾(RH 95%)、水(Tap water)以及饱和氢氧化钙溶液(Sat. Ca(OH)2) 4种养护环境对其裂缝自愈合的影响,并通过电子显微镜和能谱仪(SEM-EDS)对愈合产物进行微观分析。结果表明,氧化镁膨胀剂的加入有效提高了SHCC裂缝愈合能力,在水雾环境下有明显效果;水分是裂缝自愈合过程中必不可少的条件,即使掺有氧化镁膨胀剂,干燥环境下的愈合效果依然很差;相比于对照组,饱和氢氧化钙溶液环境下的SHCC-MEA试验组的裂缝愈合效果不理想。

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参考文献:

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