SELF-HEALING MECHANISM OF A NOVEL CEMENTITIOUS COMPOSITE USING MICROCAPSULES

摘要：

In this study,a novel self-healing cementitious composite with microcapsule hasbeen developed. An adhesive of epoxy E-51 was modified by a dilutent chemical of 1-butylglycidyl ether (BGE) for viscous adjustment and adhesion property. Urea formordihyde resinwas used to encapsulate the epoxy material,which was applied to design a new concretestructure exhibiting a self healing function. An etched sample reveals that the microcapsulesremain unbroken after typical concrete processings and a period of storage,demonstrating thatthis technology is feasible to make self-healing concrete materials,particularly in term ofengineering application. The self-healing effectiveness of the composite can be analysed by achange of the bending strength and the mechanical data obtained show a considerablerecovery for the composites designed. The fracture surface subjected to bending damage ofcomposite are studied by SEM technique,indicating that the failure mechanisms include themicrocapsules broken straightly,the microcapsules pulled out,a typical brittle fracture for thecomposite matrix and a good interface formed between the microcapsule and the cementitiousmaterial.

关键词： self-healing microcapsule cementitious composite fractography

作者: Xing Feng Ni Zhuo Han Ningxu Dong Biqin Du Xuexiao Huang Zhan Zhang Ming

作者单位: The Key Lab on Durability of Civil Engineering in Shenzhen,518060,PR China College of Chemistry and Chemical Engineering,Shenzhen University,Shenzhen,518060,PR China College of Civil Engineering,Shenzhen University,Shenzhen,518060,PR China

会议类型: 国际会议

会议名称: The International Conference on Durability of Concrete Structures(2008年混凝土结构耐久性国际学术会议)

会议地点: 杭州

会议语种:英文

页码: 195-204

在线出版日期: 2008-11-01（万方平台首次上网日期，不代表论文的发表时间）