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有关混凝土的断裂行为己被广泛研究,但很少是针对剪切断裂的情况.本文采用 型(四点剪切)加载,进行一系列测试,研究了混凝土单边预制裂纹(SEN)直梁剪切断裂的技术和条件.初步实现了混凝土的剪切断裂,测得混凝土的 型断裂韧度因子K C.实验结果显示,试件的几何尺寸越大,养护的龄期越长,实验效果越理想,在这两个因素中,试件尺寸的影响更明显.此外,混凝土的配合比与粗集料对测试结果也有重要影响,而细集料的影响似乎并不明显.同时,文中对实验结果进行了详细的分析,最后,得出一些具有工程实用价值的结论.
The fracture behavior of concrete has been studied extensively, but seldom for the case of shear fracture.In this paper, a series of tests were carried out by using four-point shear loading, and the effect of SEN shear beam shear Cutting the technology and conditions of fracture.Improved the shear fracture of concrete, measured the type of concrete fracture toughness factor K C. The experimental results show that the larger the specimen geometry, the longer the curing age, the experimental effect Ideal, in these two factors, the impact of specimen size is more obvious.In addition, the proportion of concrete and coarse aggregate test results have an important impact, but the effect of fine aggregate does not seem obvious.At the same time, the article on the experiment The results of a detailed analysis, and finally, come to some conclusions with practical value.