轻-粗混合骨料混凝土的基本力学性能试验研究

摘要

目的 以硼泥陶粒等体积替换石子为粗骨料,研究陶粒的不同体积掺量对混凝土的基本力学性能及变形性能的影响规律.方法 通过5组试验研究了陶粒体积掺量分别为0、25％、50％、75％和100％时,对混凝土28d的强度和应力-应变曲线的上升段的影响规律.结果 随着陶粒体积掺量的增大,混凝土的立方体抗压强度、轴心抗拉强度和劈裂抗拉强度均呈减小的趋势,且当陶粒体积掺量超过50％时,混凝土强度大幅降低;混凝土的应力-应变曲线上升段的斜率和峰值应力随着陶粒体积掺量的增大而逐渐减小,但峰值应变增大.结论 随着陶粒体积掺量的增大,混凝土的强度和弹性模量逐渐降低;提出了不同陶粒体积掺量的混凝土的本构方程建议.%The effects of different volume of ceramist on the basic mechanical properties and deformation behavior of concrete were conducted to investigate by replacing the gravel as coarse aggregate with the volume of boron mud ceramist.The influence of the volume fraction of ceramist with 0,25％,50％,75％ and 100％ on the strength and stress-strain curve of concrete at 28d was studied by 5 groups of experiments.The comprehensive strength,axial tensile strength and splitting tensile strength of concrete decrease with the increase of the volume fraction of ceramist,and the strength of concrete decreases greatly when the volume of ceramist is more than 50％.And the slope of the stress-strain curve and the peak stress decrease with the increase of the volume fraction of the aggregate,but the peak strain increases.The strength and elastic modulus of concrete decrease with the increase of the volume of ceramist,and this paper suggests the constitutive equation of concrete of different ceramist volume.