粗骨料含量对超高性能混凝土抗压强度尺寸效应的影响

Scale Effect on Cubic Compressive Strength on Ultra-High Performance Concrete Containing Coarse Aggregate

完成了4组粗骨料含量,3个水胶比和4个几何尺寸含粗骨料超高性能混凝土(UHPC)立方体试件的抗压强度试验,分析了粗骨料含量和水胶比等对含粗骨料UHPC立方体抗压强度尺寸效应的影响,结果表明:粗骨料含量对UHPC立方体抗压强度尺寸效应影响较大,含粗骨料UHPC立方体抗压强度尺寸效应度约为不含粗骨料UHPC的1.39倍。随水胶比的提高,含粗骨料UHPC立方体抗压强度尺寸效应逐渐减弱。建议了含粗骨料UHPC立方体抗压强度尺寸换算系数,提出了尺寸效应律参数计算公式,可预测含粗骨料UHPC的立方体抗压强度。

The scale effect on the cubic compressive strength of ultra-high performance concrete(UHPC) containing coarse aggregate with respect to the influences of coarse aggregate content and water-binder ratio was investigated via the uniaxial compressive tests.The results show that the coarse aggregate content has an influence on the scale effect of UHPC containing coarse aggregate. The scale effect degree of UHPC containing coarse aggregate is approximately 1.39 times as that of UHPC without coarse aggregate. The scale effect on cubic compressive strength of UHPC containing coarse aggregate decreases gradually with the increase of water-binder ratio. The scale conversion coefficient of cubic compressive strength of UHPC containing coarse aggregate was given.The parameter calculation formula of scale effect law was proposed, which could predict the cubic compressive strength of UHPC with coarse aggregate.