改性轻骨料混凝土基本力学性能试验研究

Experimental research on mechanics performance of modified performance aggregate lightw eight concrete

轻骨料混凝土以其轻质、高性能,利于环境保护的特点在工程中有着广泛的应用前景,符合现代可持续发展的要求。为改善轻骨料混凝土的脆性问题,提高其变形性能,采用10%~30%浓度的聚合物乳液浸泡轻骨料的方式,配制出不同聚合乳液掺量(10%、15%、20%、25%、30%)的改性轻骨料混凝土,并对其进行了立方体强度抗压试验、弹性模量试验、劈裂抗拉强度试验、轴心抗压强度试验。相对于轻骨料混凝土,聚合乳液掺量为10%~30%的改性轻骨料混凝土的立方体抗压强度下降了3.75%~16.38%,弹性模量下降了9.34%~15.21%,轴心抗压强度下降了5.16%~27.68%,但聚合乳液掺量为10%~30%的改性轻骨料混凝土的劈裂抗拉强度提高了1.31%~24.89%;根据试验破坏特征可得,改性轻骨料混凝土的变形能力、脆性问题较轻骨料混凝土有所改善。

Lightweight aggregate concrete with its lightweight,high performance and the characteristics of environmental protection has a broad application prospect in engineering,in line with the requirements of modern sustainable development.To improve the brittleness of the lightweight aggregate concrete and enhance its deformation performance by soaking the lightweight aggregate in the concentration of10%~30% polymerized emulsion,configure the modified lightweight aggregate concrete with different dosage（10%,15%,20%,25%,30%）of emulsion polymerization,and we make experiments on cube compressive strength test,elastic modulus test,splitting tensile strength test,axial compressive strength test.Compared with lightweight aggregate concrete,the cubic compressive strength of modified lightweight aggregate concrete with dosage of 10% ~30% polymerized emulsion decreased by 3.75% ~16.38%,the elastic modulus decreased by9.34% ~15.21%,the axial compressive strength decreased by 5.16% ~27.68%,but the splitting tensile strength of modified lightweight aggregate concrete with dosage of 10%~30% polymerized emulsion increased by 1.31%~24.89%.According to the failure characteristics of test,the deformation capacity and brittleness of modified lightweight aggregate concrete have been improved and better than lightweight aggregate concrete.