小直径芯样强度推定混凝土抗压强度方法的比较

Study on the relationship between the mechanical properties of concrete by small diameter core samples

采用不同试验装置分别测试微小芯样试件的抗拉强度、抗折强度、抗剪强度以及相应龄期标准方体试件抗压强度,以小芯样混凝土力学强度为自变量,立方体混凝土抗压强度为因变量,采用最小二乘法对试验数据进行回归拟合,给出相应的小芯样强度推定结构混凝土抗压强度换算曲线,同时本文重点从不同角度比较各检测方法的检测精度,并从理论角度对其产生原因进行剖析。研究结果可供工程结构混凝土强度检测与理论研究参考。

Using different experimental devices were tested with micro core sample tensile strength, flexural strength, shear strength and standard cube compressive strength at the corresponding age. Taking all kinds of mechanical strength of small core concrete as independent variable and cube concrete compressive strength as dependent variable, least squares method is used to regress the obtained test data, and corresponding conversion strength curves of compressive strength of concrete structure with small core strength are deduced. At the same time, this paper compares the detection precision of the detection methods from different angles, and analyzes the cause from the theoretical point of view. The research results can be used as a reference for the strength quality testing and theoretical research of the construction concrete.