【摘要】 通过劈裂和剪切试验得到砂浆-骨料复合试件界面的粘结抗拉强度,界面的I型断裂特征通过三点弯曲试验得到。并采用改进的J积分方法,利用试验结果提出了砂浆-骨料界面的拉伸软化曲线模型。另外,将光纤传感器分别埋置于砂浆中和粘贴在骨料表面,测量单轴受压试验中砂浆、骨料的变形过程及二者间的相对滑移值,从而建立了砂浆-骨料界面的粘结滑移本构关系曲线。同时,根据试验及分析结果,提出了砂浆-骨料界面的细观力学本构关系,为数值模拟提供了可靠的分析模型。更多还原

【Abstract】 In this study,the bond strength of the mortar-aggregate interface was determined through the splitting tensile test and the direct shear test with the composite mortar-aggregate specimens. Three point bending test was conducted to obtain the fracture parameters of type I mortar-aggregate interface. Through the modified J-integral method,the mortaraggregate interface softening curve model under tensile stress was developed based on the test results. Meanwhile,the uniaxial compression test was conducted to investigate the bond slip of the interface,in which the optical fiber sensors were used to measure the strains of mortar and aggregate. And then,the bond slip relationship between mortar and coarse aggregate was established. Also the meso-scale constitutive relationship commonly used in the current numerical simulation of concrete was analyzed. With the experimental result,the constitutive relationship of mortar-aggregate interface was proposed. These findings provided valid analysis models for the numerical simulations.更多还原