废玻璃粉混凝土力学性能与应力-应变本构关系

Mechanical properties and stress-strain constitutive relation of waste glass powder concrete

为有效利用玻璃固废材料,将废玻璃粉用作水泥掺合料,制备废玻璃粉混凝土.通过废玻璃粉混凝土力学性能试验,分析了废玻璃粉替代水泥的原理.基于废玻璃粉混凝土破坏机制,探讨了各个力学性能指标变化规律.采用随机损伤本构关系对比分段式本构关系探讨了废玻璃粉混凝土应力-应变本构关系,并且分析了废玻璃粉混凝土损伤演化、脆性指数等变形性能.试验结果表明随着废玻璃粉取代率的增大,废玻璃粉混凝土脆性指数会微弱减小,其立方体抗压强度、轴压强度减小幅度大于弹性模量和劈裂抗拉强度的降低幅度;废玻璃粉混凝土初始损伤阶段持续时间相对较短,裂缝扩展速率在应变为1×10^(-3)~6×10^(-3)之间相对较平稳;分段式本构关系和随机损伤本构关系的计算结果与实测结果吻合良好.废玻璃粉替代水泥,在混凝土材料中有较好应用前景.

To use glass solid waste materials effectively,waste glass powder was used as cement admixture to prepare waste glass powder concrete(WGPC).The principle of replacing cement with waste glass powder was analyzed through mechanical properties test of WGPC.Based on the failure mechanism of WGPC,the variation rules of each mechanical properties were discussed.The random damage constitutive relationship was compared with the segmented constitutive relationship to discuss the stress-strain constitutive relationship of WGPC.Deformation properties such as damage evolution and brittleness index of the WGPC were also analyzed.The test results indicated that:with the increase of the substitution rate,the brittleness index of the WGPC will decrease slightly,and the reduction of its cubic compressive strength and axial compressive strength was larger than that of the elastic modulus and splitting tensile strength.The initial damage stage of the WGPC will last shorter,and the crack growth rate was relatively stable,especially in strain of 1×10^(-3)-6×10^(-3).The calculation results of the segmental constitutive relationship and the random damage constitutive relationship were consistent with the experimental results.Instead of cement,waste glass powder possesses a good application prospect in concrete materials.