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公路路面和机场道面混凝土板的破坏主要是由于车轮荷载和温度等作用引起过度的弯拉应力而折断。因此,路面和机场道而混凝土的强度设计控制指标不是常用的混凝土抗压强度,而是混凝土的抗折(抗弯拉)强度,它是评价路用混凝土的主要质量指标。抗折强度的标准检验方法,是将混凝土制成15×15×55厘米的小梁,用双支三分点按规定的速度加载后测梁。这样的小梁试件每组三根,每根重量约30公斤左右,重量体积都比较大,给及时检验混凝土带来一定困难。我们想,混凝土的抗折强度是一种弯拉破坏的受力状态;圆柱体的劈裂强度,从宏
The damage of road pavement and airport pavement concrete slab is mainly due to the excessive bending and tension stress caused by the load of the wheel and the temperature. Therefore, the strength and design control indexes of pavement and airport road concrete are not common compressive strength of concrete, but the flexural strength (flexural strength) of concrete, which is the main quality index to evaluate road concrete. Bending strength of the standard test method is to make concrete 15 × 15 × 55 cm trabecular, double-branched three points at a predetermined speed loading beam. Such trabecular specimens of three each group, each weighing about 30 kilograms, weight and volume are relatively large, to test concrete in time to bring some difficulties. We think that the flexural strength of concrete is a bending strength of the tensile stress; the cleavage strength of the cylinder, from the macro