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采用双材料楔入劈拉试件,研究了超高韧性水泥基复合材料(ECC)与混凝土黏结界面的断裂性能,讨论了最粗糙面、次粗糙面和光滑面3种界面粗糙度对界面破坏模式及断裂韧度的影响;结合界面力学理论,分析了裂缝偏折破坏与界面破坏的发生及界面粗糙度对裂缝偏折的影响.结果表明:对于最粗糙和次粗糙界面试件,以骨料-ECC黏结界面破坏及小角度偏折界面破坏为主,而光滑界面试件以界面破坏为主;提高黏结界面粗糙度可以使黏结界面的强度有一定程度的提高,并且界面裂缝在加载过程中易于偏向ECC,可实现ECC的裂缝捕捉,因此,当黏结界面受力状况不明确时,应尽量提高ECC-混凝土界面粗糙度,避免发生界面破坏,从而最大地发挥ECC效用.
The dual-material wedging splitting test specimens were used to study the fracture properties of ultrahigh-toughness cementitious composites (ECC) and concrete interface. The effects of three kinds of interface roughness, rough surface, secondary rough surface and smooth surface, Mode and fracture toughness.According to interface mechanics theory, the influence of fracture deflection and interface failure and interface roughness on fracture deflection are analyzed.The results show that for the most rough and sub-rough interface specimens, The interfacial failure of the material-ECC bonding interface and the fracture of the small angle deflection interface are dominant, while the smooth interface specimens are mainly interfacial failure. Increasing the interfacial roughness can increase the strength of the interfacial bonding interface to a certain extent and the interfacial cracks during the loading process ECC is easy to be offset to achieve ECC crack capture, therefore, when the bonding interface force status is not clear, you should try to improve ECC-concrete interface roughness, to avoid interface damage, so as to maximize the effectiveness of ECC.