短龄期再生混凝土三轴受压力学性能及其本构关系  

Mechanical Properties and Constitutive Relationship of Short Age Recycled Coarse Aggregate Concrete under Tri-axial Compression

作　　者：陈宗平[1,2] 应武挡 陈宇良[1] 姚侃[1] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004 [3]同济大学建筑工程系,上海200092

出　　处：《建筑材料学报》2015年第6期935-940,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51268004;51578163);广西自然科学基金资助项目(2012GXNSFAA053203;2013GXNSFDA019025);广西科技攻关项目(桂科攻12118023-3)

摘　　要：为研究短龄期再生混凝土的三轴受压力学性能,以龄期和围压值为变量,设计了14个圆柱体再生混凝土试件进行三轴受压试验,观察其破坏形态,获取应力-应变曲线、峰值应力、峰值应变以及弹性模量等数据.基于试验数据分析了龄期和围压值对再生混凝土三轴受压力学性能的影响规律,建立了短龄期再生混凝土三轴受压的峰值应力、峰值应变和弹性模量的计算公式,并建立了再生混凝土三轴受压状态下的应力-应变本构方程.结果表明:短龄期再生混凝土的峰值应变、弹性模量受龄期影响较大,随着龄期的延长,峰值应变减小,而弹性模量却显著增大;围压值对再生混凝土的峰值应力、峰值应变和弹性模量均有显著影响.采用CEB-FIP(1990)规范中方法计算的再生混凝土三轴抗压强度值与实测值吻合较好.In order to reveal the mechanical properties of short age recycled coarse aggregate concrete under tri-axial compression,14 cylinder specimens were designed for tri-axial compression test.Aging time and lateral confinement were considered as variables in the test.Failure patterns of specimens were observed,peak stress,peak strain,elastic modulus and stress-strain curves were obtained.Based on the experimental data,the influence of aging time and lateral confinement on the mechanical properties of short age recycled coarse aggregate concrete under tri-axial compression were analyzed;the strength calculation methods were discussed;the formulas of elastic modulus,peak strain,peak stress and stress-strain constitutive equation were put forward.Results show that：aging time has a great influence on peak strain and elastic modulus;on the other hand,peak stress,peak strain and elastic modulus of recycled coarse aggregate concrete are significantly influenced by lateral confinement.The calculated results by CEB-FIP（1990）are in good agreement with experimental data.

关 键 词：短龄期 再生混凝土 三轴受压 强度计算 本构方程 

分 类 号：TU528.01[建筑科学—建筑技术科学]