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实验室分别预制强度等级为C20、C30、C40的试块,采用钻芯法检测混凝土的抗压强度和劈裂抗拉强度,并对普通混凝土芯样劈裂抗拉强度与抗压强度相关性进行分析,试验表明:选用幂函数来估计芯样的劈裂抗拉强度与抗压强度的相关关系最为合适,其相关系数R为0.938,R方为0.879,其相关关系公式:f_c=20.792×f_(st)~(0.578)。
The laboratory prefabricated the blocks of C20, C30 and C40 strength, the compressive strength and splitting tensile strength of concrete were measured by the method of core drilling, and the correlation between splitting tensile strength and compressive strength of common concrete core The results show that the correlation coefficient between the splitting tensile strength and the compressive strength of the core sample is the best when the power function is used. The correlation coefficient R is 0.938 and R is 0.879. The correlation formula is as follows: f_c = 20.792 × f_ (st) ~ (0.578).