砂率对超高性能混凝土的性能研究

Study on sand ratio of ultra high performance concrete

研究了不同砂率对超高性能混凝土流动性能,抗压、抗折强度的影响,并通过超声检测法建立了抗压强度与超声波速之间的关系。结果表明:随着砂率的增加,超高性能混凝土流动性能呈现先增大后减小的趋势,随着砂率的增加,超高性能混凝土的抗压强度先增加后减小,而砂率对其抗折强度影响并不是很明显,通过建立回归方程发现,用线性函数拟合抗压强度与超声波速的关系更加贴近实际。

It studies the effects of different sand ratios on the fluidity,compressive and flexural strength of UHPC,and establishes the relationship between compressive strength and ultrasonic velocity through ultrasonic testing.The results show that with the increase of sand ratio,the flow performance of UHPC increases first and then decreases.With the increase of sand ratio,the compressive strength of UHPC increases first and then decreases,while the effect of sand ratio on its flexural strength is not obvious.By establishing regression equation,it is found that the linear function is used to fit the resistance.The relationship between compressive strength and ultrasonic velocity is closer to reality.