摘要
采用超强韧性聚丙烯、聚乙烯醇纤维混凝土进行叠层修补体系的理论分析和试验研究。利用材料的韧性及断裂力学中能量释放率的关系对界面裂纹扩展与分叉的发生准则进行解释,描述在工程水泥基复合材料(ECC)修补试验中观察到的界面裂纹扩展和分叉裂纹的独有捕获过程及其产生机理。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修补体系有明显改善;不同于传统的脱层失效模式或剥落失效模式,当超强韧性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,该特征使其成为路面工程所需要的具有优良耐久性的理想修补材料。
Research on the application of PP and PVA ECC as overlay in the repair of deteriorated concrete structures was performed. Interfacial crack propogating and kinking mechanismobserved in ECC/concrete overlay repair system was described by comparison of toughness and energy release rate. Experimental testing reveals significant improvement in load carryingcapacity and ductility over conventional concrete overlay. The commonly observed overlay system failure mode of delamination or spalling is eliminated when ECC is applied. These failure modesare suppressed with multiple saturated cracking when ECC is used. The unique material behavior makes ECC an ideal candidate material for durable overlay application.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2013年第1期44-50,共7页
China Journal of Highway and Transport
基金
国家自然科学基金项目(50978171)
