补偿收缩钢渣混凝土应力-应变关系试验  

Stress-Strain Relationship of Shrinkage Compensating Steel-Slag Concrete

作　　者：于峰[1] 王旭良[1] 张扬[1] 徐琳[1] 

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243002

出　　处：《建筑材料学报》2017年第4期527-534,共8页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51608003);安徽省教育厅重大科学研究项目(KJ2015ZD10);安徽省重点研究与开发计划项目(1704a0802131);安徽省自然科学基金资助项目(1208085QE88);安徽省高校优秀青年人才支持计划重点项目(gxygZD2016072);马鞍山市科学技术项目(马科;2012(6))

摘　　要：以废弃钢渣为粗骨料制备补偿收缩钢渣混凝土试件,并对其进行抗压强度、弹性模量及泊松比试验,分析了水灰比对补偿收缩钢渣混凝土试件破坏形态、抗压强度、变形及应力-应变关系的影响.结果表明:补偿收缩钢渣混凝土试件破坏形态与普通混凝土相似,但前者出现裂缝时间较晚,裂缝发展速度较快,峰值应变较小;随着水灰比的减小,补偿收缩钢渣混凝土试件的抗压强度逐渐增大,弹性模量先增后减;补偿收缩钢渣混凝土试件的变形、应变和弹性模量均小于普通混凝土,泊松比是普通混凝土的2~3倍.由于补偿收缩钢渣混凝土内部含有的缺陷和空隙较少,其应力-应变关系曲线的线性阶段较长,曲线反弯点不明显.基于补偿收缩钢渣混凝土试验结果,提出了补偿收缩钢渣混凝土峰值应力、峰值应变、弹性模量和泊松比的计算方法,建立了补偿收缩钢渣混凝土应力-应变关系模型,此模型计算结果与试验结果吻合较好.Shrinkage compensating concrete specimens were prepared by adding waste steel-slag.Experiment on compressive strength,elastic modulus and Poisson＇s ratios of concrete prism were carried out to analyze the effect of water-cement ratio on the failure mode,compressive strength,deformation and stressstrain relationship.Test results show that the failure mode of shrinkage compensating steel-slag concrete is similar to that of ordinary concrete,the cracking time of shrinkage compensating steel-slag concrete is later,the crack growth rate is faster,and the peak strain is smaller.With the decrement of water-cement ratio,the bearing capacity of the specimens increases gradually,and the elastic modulus increases at first and then decreases.The deformation,strain and elastic modulus of the specimens are all less than that of ordinary concrete,and Poisson＇s ratio is 2-3times of ordinary concrete.Due to the less internal defects and voids of shrinkage compensating steel slag concrete,the linear phase of the stress-strain curve is longer,and the bend point of the curve is not obvious.Based on the experimental study of shrinkage compensating steel slag concrete,the calculating formula of the peak stress,peak strain,elastic modulus and Poisson＇s ratio of the shrinkage compensating steel-slag concrete is proposed,and then the stress-strain model is established.The calculating results of the model are in good agreement with the experimental results.

关 键 词：补偿收缩 钢渣混凝土 应力-应变关系 力学性能 

分 类 号：TU528.59[建筑科学—建筑技术科学]