中文摘要：

为了改善破损混凝土的修补工艺与修补质量,进行了超强韧性纤维混凝土进行叠层修补体系试验的研究.通过素混凝土与超强韧性纤维混凝土的修补体系的对比,研究了在试验中观察到的修补系统内部界面裂纹的扩展和分叉裂纹的捕获过程及产生机理.试验结果表明,超强韧性纤维混凝土叠层修补体系的承载能力和延性相对于传统混凝土的修补体系有了明显的改善,产生不同于传统的脱层失效模式或剥落失效模式.超强聚丙烯纤维混凝土作为叠层修补材料时会产生独特的多重裂纹破坏模式,该特征使其成为耐久性修补工程应用所需的理想材料.

英文摘要：

Research on the application of ultra-ductile fiber reinforced concrete as overlay in the repair of deteriorated concrete structures was performed.Interfacial crack kinking and trapping mechanism experimentally observed in a concrete/FRC（fiber reinforced concrete） overlay repair system are described.The mechanism involves cycles of extension,kinking and arrest of interfacial crack into the overlay.Experimental testing of proposed overlay repair system reveals significant improvements in load carrying capacity and ductility over conventional concrete overlay.The commonly observed overlay system failure mode of delamination or spalling are suppressed when ultra-ductile PP FRC is applied as the overlay repair material.The failure mode of proposed repair overlay system is unique,which makes the ultra-ductile FRC an ideal candidate material for durable overlay applications.