摘要
将钢纤维(SF)掺入橡胶混凝土中,能够改善由于橡胶颗粒掺入导致的强度降低,并进一步增加延性。为研究SF-橡胶/混凝土的抗压性能,配制得到SF体积分数分别为0vol%、0.5vol%、1.0vol%和1.5vol%及橡胶颗粒等体积替换砂率为0%、10%和20%的10组SF-橡胶/混凝土试件,并进行单轴受压全曲线试验。结果表明:SF的桥联作用及其与橡胶颗粒的协同作用可改善混凝土的抗压性能,试件破坏呈明显延性特征。随SF掺量的增加,SF-橡胶/混凝土试件的抗压强度及弹性模量均明显增大,其相应峰值应力的应变及全曲线峰值后延性也相应增加;随橡胶颗粒掺量的增加,SF-橡胶/混凝土试件相应峰值应力的应变及全曲线峰值后延性增加,而抗压强度及弹性模量有所减小。在已有研究基础上,通过曲线拟合试验数据,提出适用于SF-橡胶/混凝土的单轴受压应力-应变全曲线数学表达式,模型与试验结果吻合较好,为此类混凝土的结构分析设计提供了理论基础。
Adding steel fiber(SF)into rubber concrete can improve the strength reduction caused by the incorporation of rubber particles,and further increase the ductility.Ten groups of SF-rubber/concrete under uniaxial compression were conducted in order to study the compressive properties.The crumb rubber particles were incorporated at different percentages of 0%,10%and 20%by volume substation of sand,and SF with volume fraction of 0vol%,0.5vol%,1.0vol%,and 1.5vol%were added to the concrete mixture.The results show that the bridging action of SF and its positive synergy with rubber particles in SF-rubber/concrete can improve the compressive behavior of concrete.The failure process of SF-rubber/concrete specimens is mild and slow,and the failure mode is obviously ductile.After adding SF,the compressive strength and elastic modulus of the SF-rubber/concrete increase obviously,and the strains at the peak stress and the post-peak ductility increase.With the increase of rubber particles,the strain at the peak stress and the post-peak ductility of SF-rubber/concrete further increase.But the compressive strength and elastic modulus of SF-rubber/concrete are reduced by adding rubber particles.Based on the test data and the literature of stress-strain curve expression,a more suitable analytical model was proposed to generate the stress-strain curve of SF-rubber/concrete,which can be applied in the analysis and design of SF-rubber/concrete structural members.
作者
赵秋红
董硕
朱涵
ZHAO Qiuhong;DONG Shuo;ZHU Han(School of Civil Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Coastal Civil Structure and Safety of China Ministry of Education,Tianjin University,Tianjin 300350,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2021年第7期2359-2369,共11页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(51678406,51878447,51378340)
天津市研究生科研创新项目(2019YJSB162)。
关键词
钢纤维-橡胶/混凝土
单轴受压应力-应变全曲线试验
钢纤维掺量
橡胶掺量
本构模型
steel fiber-rubber/concrete
stress-strain curve test under uniaxial compression
volume fraction of steel fiber
volume substation of rubber particles
constitutive model
