陶粒对SC-SCC黏结界面劈裂破坏特性的影响

Effect of Ceramsite on Splitting Failure Characteristics of SC‑SCC Bonding Interface

基于劈裂试验,研究了陶粒对蒸养混凝土(SC)-自密实混凝土(SCC)黏结界面力学特性的影响.结果表明:陶粒能提高SC-SCC黏结界面的劈裂抗拉强度,增加黏结界面的张开位移值,提升黏结界面的延性;黏结界面应力-应变曲线可分为线性发展阶段、塑性发展阶段和失效破坏阶段;双参数Weibull分布模型可较好地模拟黏结界面应力-应变曲线的上升段,当黏结界面的陶粒引入量低于4 kg/m2时,黏结界面损伤变量的演化进程被有效减缓.

Influence of ceramsite on mechanical properties of bonding interface between steam cured concrete(SC)-self-compacting concrete(SCC)was investigated by splitting test.The results show that addition of ceramsite can improve splitting tensile strength of bonding interface,increase bonding interface opening displacement value and thus significantly increase ductility of bonding interface.Stress-strain curves of bonding interface can be divided into linear development stage,plastic development stage and failure stage.The two-parameter Weibull distribution model can better simulate the rising section of stress-strain curves of bonding interface,and when the amount of ceramsite is less than 4 kg/m2,the evolution process of damage variable can be reduced with increasing ceramsite content.