混凝土劈拉破坏机理研究

Research of concrete split and tensile failure mechanism

通过对混凝土进行巴西圆盘劈裂试验,测试了混凝土的抗拉强度,获取了试验试件的破坏形态、加载力—位移曲线,并对试验后混凝土试件破坏界面进行了分析,结果表明:巴西圆盘劈拉试验中,其破坏面上主要是砂浆和骨料界面的粘结破坏和骨料的断裂,水泥砂浆和骨料的力学性质,以及它们的几何分布都对劈拉试验中试件裂缝的形成和发展有重大影响。

By means of Brazilian disk splitting test,the tensile strength of concrete were tested failure mode of test piece and loading force-displacement curve is presented. Analyzing interfacial failure of concrete test piece,it turns out that bonding failure and aggregate breakage of mortar and aggregate interface is primary on the failure surface. In addition,mechanical properties of cement mortar and aggregate,as well as geometric distribution,has a great influence on test piece tears＇ formation and development.