有机轻集料混凝土的单轴受压试验研究

Experimental Investigation into Compression Property of Organic Lightweight Aggregate Concrete Under Uniaxial Loading

研究了原发发泡聚苯乙烯(EPS)颗粒、再生EPS颗粒或废橡胶粒部分取代粗集料的有机轻集料混凝土在单轴受压时的破坏形态、弹性模量、应力-应变全曲线等,并采用不同公式对有机轻集料混凝土的应力-应变全曲线进行拟合.结果表明:各轻集料混凝土的应力-应变全曲线总体形状与普通混凝土的相似,但曲线上各特征点与普通混凝土不同;轻集料混凝土的弹性模量和峰值应力显著低于基准混凝土,再生EPS混凝土的弹性模量与原发EPS混凝土的相近;橡胶混凝土的弹性模量和峰值应力最低,但其峰值应变与峰值应力比是各混凝土中最高的;混凝土的弹性模量、峰值应力和峰值应变随着原发EPS掺量的增加而下降;采用不同公式对有机轻集料混凝土的应力-应变全曲线进行拟合得到的拟合曲线与试验数据相关性较好,相关系数达93%以上.

In this paper,three kinds of organic lightweight aggregate concrete,whose coarse aggregate was partially substituted respectively by virgin expanded polystyrene（EPS） beads,recycled EPS beads and waste rubber particles,respectively,were prepared,and the failure mode,elastic modulus and complete stress-strain curve of the concrete under uniaxial loading were investigated.Moreover,the complete stress-strain curves of the organic lightweight aggregate concrete were fitted by using different formulas.The results illustrate that the complete stress-strain curves of the organic lightweight aggregate concrete are all similar to those of the ordinary concrete,while the feature points on the curves are significantly different from those of the ordinary concrete,that the elastic modulus and peak stress of the concrete are remarkably lower than those of the control concrete,that the elastic modulus of the recycled EPS concrete is similar to that of the virgin EPS concrete,that rubber concrete is of the lowest elastic modulus and peak stress but it is of the highest ratio of peak elastic modulus to peak stress,that the elastic modulus,peak strain and peak stress of EPS concrete all decrease with the increase in EPS dosage,and the complete stress-strain curves of the three kinds of concrete fitted with different formulas all accord well with those obtained by experiments,with the correlation coefficient being more than 93%.