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一、正常破坏试块按标准试验要求制得的混凝土立方体试块,当在压力机上承受的正压力增至一定程度时,四个立面上逐渐出现的破裂状态应近似对称。因为试块在承受正压力且发生纵向变形的同时,将产生相应的横向变形。但由于试块的上下两个承压面与压力机上下压板之间有摩擦力,使上述横向变形受到阻碍。这种阻碍作用,自试块上下两受压面起,到试块中部,因其高度变化而递减。因而破坏后的残体两受压面几乎是完整如初的,而每个立面则是越接近试块中部破坏得越利害。所谓“棱柱形的残体”(如图1-甲),应认
First, the concrete failure test block in accordance with the standard test requirements of the concrete cube test block, when the pressure on the press to a certain degree of positive pressure, the gradual emergence of the fracture on the four facades should be approximately symmetrical. Because the test block is under positive pressure and undergoes longitudinal deformation, it will produce corresponding lateral deformation. However, due to friction between the upper and lower pressure receiving surfaces of the test block and the upper and lower press plates of the press, the above-mentioned lateral deformation is hindered. This obstruction effect decreases from the upper and lower pressure surfaces of the test block to the middle of the test block, which decreases as the height changes. As a result, the two pressed surfaces of the damaged body are almost intact, and the closer each surface is to the center of the test block, the more damaged it becomes. The so-called “prismatic debris” (Figure 1-A) should be recognized