(6363)--微胶囊自修复水泥基材料修复效果及机理研究.pdfVIP

全国中文核心期刊 中国科技核心期刊 微胶囊自修复水泥基材料 修复效果及机理研究 摘要：以多组分物理、化学膨胀修复剂为芯材，聚乙烯醇（PVA）为壁材，采用圆锅造粒法制备自修复微胶囊；以渗透性测试评 价微胶囊掺量和裂缝宽度对裂缝修复效率的影响，并通过SEM 和XRD 确定自修复机理。结果表明：裂缝宽度一定时，微胶囊掺量 越高，裂缝修复效率越高；微胶囊掺量一定时，裂缝宽度越小，裂缝修复效果越好；裂缝修复的主要机理是裂缝中膨润土的物理膨胀 和钙矾石晶体及碳酸钙晶体的生成。 关键词：自修复；渗透性；微胶囊掺量；裂缝宽度 中图分类号：TU528.04 文献标识码：A 文章编号：1001-702X （2019）11-0108-04 Study on the healing efficiency and mechanism of capsule-based self-heaing cementitious material JIN Chengyang ，YANG Yang，JIN Haidong ，GU Chunping （College of Civil Engineering and Architecture ，Zhejiang University of Technology ，Hangzhou 310023 ，China） Abstract ：Round pan granulation method was applied to prepare the self-healing microcapsules ，using physical and chemical expansive agents as core materials and polyvinyl alcohol （PVA）as the coating material. The influences of microcapsule content and crack width on the healing efficiency were evaluated with water-permeability tests ，and the self-healing mechanism was investigated with scanning electron microscopy （SEM）and X-ray diffraction （XRD）analysis. The results showed that ，with a certain crack wit- dh ，the higher capsule content resulted in higher healing efficiency; with a certain capsule content ，the smaller crack width led to higher healing efficiency. The self-healing mechanism was the physical expansion of the bentonite and the formation of ettringite and calcium carbonate in crack. self-healing ，water permeation ，microcapsule content ，crack width Key words ： [5]