石灰石煅烧黏土超高性能混凝土抗压力学性能研究

On Compressive Mechanical Properties of Limestone Calcined Clay Cement-Based Ultra-High Performance Concrete

为加快推进低碳建材产品的研发应用,设计并制备石灰石煅烧黏土超高性能混凝土(LC^(3)-UHPC),研究石灰石和煅烧黏土掺量对LC^(3)-UHPC流动度和抗压强度的影响。试验结果显示:随着石灰石煅烧黏土对水泥替代率的增加,LC^(3)-UHPC的抗压强度整体呈下降趋势;当煅烧黏土与石灰石质量比为1∶2、石灰石煅烧黏土对水泥的替代率为30%时,抗压强度最大,为最优配合比;抗压强度越高,形状效应对抗压强度的影响越小。

To accelerate the research and application of low-carbon building materials,limestone calcined clay ultra-high performance concrete(LC^(3)-UHPC)was designed and prepared,and the influence of the dosage of limestone and calcined clay on the fluidity and compressive strength of LC^(3)-UHPC was studied.The test results show that with the increase of the substitution rate of limestone calcined clay for cement,the compressive strength of LC^(3)-UHPC shows an overall downward trend.When the mass ratio of calcined clay to limestone is 1:2 and the substitution rate of limestone calcined clay for cement is 30%,the compressive strength is the maximum,which is the optimal mix ratio.The higher the compressive strength,the smaller the influence of the shape effect on the compressive strength.