塑性混凝土强度和尺寸效应的试验研究

通过对12个配合比、3个龄期共405个塑性混凝土试块的强度试验,研究了塑性混凝土相关强度之间的关系,塑性混凝土抗压强度和劈拉强度的尺寸效应,以及塑性混凝土抗压强度与龄期之间的关系。试验结果表明:塑性混凝土抗压强度、劈拉强度、抗折强度之间具有良好的统计关系;相比边长为150 mm的立方体试块,边长为100 mm的塑性混凝土立方体试块的抗压强度和劈拉强度的尺寸效应系数分别为0.937 5和0.861 6;龄期对塑性混凝土的抗压强度有较大的影响。在此基础上,建立了相关强度指标之间的换算关系式以及轴心抗压强度与龄期的对数关系式。

Experimental study on strength and size effect of plastic concrete

Based on the strength tests on 405 specimens of plastic concrete with 12 mix proportions and 3 curing ages,the relationship among relevant strengths,the size effect of compressive strength and splitting tensile strength and the relationship between compressive strength and curing age were systematically investigated.The test results show that the compressive strength,splitting tensile strength and flexural strength of the plastic concrete exhibit a good statistical relationship.The cubic specimens with the side length of 100 mm have size effect coefficients of the compressive strength and splitting tensile strength of 0.937 5 and 0.861 6 respectively compared with those with the side length of 150 mm.The curing ages have great influences on the strength of plastic concrete.On such a basis,the conversion formulae among relevant strength indices and the logarithmic relationship between the axial compressive strength and the curing age were established.