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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。
The theoretical analysis and experimental research of super-tough polypropylene and polyvinyl alcohol fiber reinforced concrete are carried out. The criterion of occurrence of interfacial crack propagation and bifurcation is explained by the relationship between the toughness of the material and the energy release rate in fracture mechanics. The interfacial crack growth and bifurcation cracks observed in engineering cement-based composites (ECC) repair tests are described Unique capture process and its generation mechanism. The results show that the load-bearing capacity and ductility of the super-ductile fiber reinforced concrete laminated repair system are obviously improved compared with the traditional concrete repair system. Different from the traditional delamination failure mode or exfoliation failure mode, when the super-toughness polypropylene fiber reinforced concrete Layer repair materials produce a unique pattern of multiple crack failure, which makes it an ideal repair material with excellent durability for pavement engineering.