钢纤维再生混凝土受压本构模型及弯曲韧性试验研究  

Experimental study on compressive capacity model and flexural toughness of steel fiber recycled concrete

作　　者：李庆瑞[1] 魏涛 刘康宁 LI Qingrui;WEI Tao;LIU Kangning(College of Civil Engineering,Xijing University,Xi′an 710123,China;College of Civil Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China)

机构地区：[1]西京学院土木工程学院,陕西西安710123 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《混凝土》2021年第10期31-35,共5页Concrete

基　　金：国家自然科学基金资助项目(51178388);陕西省教育厅重点实验室科研计划项目(11JS059,12JS055);西京学院科研基金项目(XJ130233)。

摘　　要：为了研究钢纤维对再生混凝土抗压强度及弯曲韧性影响,对RA替代50%和100%的再生混凝土分别掺入不同掺量钢纤维进行了单轴受压试验,并采用不同混凝土本构模型对其本构曲线进行拟合分析,最后计算了等效初始弯曲强度、初始弯曲韧度比、等效残余弯曲强度、残余弯曲韧度比,对其弯曲韧性进行研究。研究结果表明:RA替代率50%和100%时,棱柱体抗压强度均增加随着钢纤维体积掺量的增加;规范模型和过镇海模型对再生混凝土本构模型拟合结果精度较高;钢纤维掺量从0.5%~1.5%时,RA替代率50%的弯曲韧性优于RA替代率100%。In order to study the influence of steel fiber on the compressive strength and flexural toughness of recycled concrete,the uniaxial compression tests of RA replacing 50%and 100%recycled concrete mixed with different amounts of steel fiber were carried out,and the corresponding analysis of the corresponding curves was carried out with different concrete models.Finally,the equivalent initial bending strength,the ratio of initial bending toughness and the equivalent residual bending were calculated The ratio of flexural strength to residual flexural toughness was studied.The results show that the compressive strength of prisms increases with the increase of volume fraction of steel fiber when the RA substitution rate is 50%and 100%.The fitting accuracy of standard model and Guo Zhenhai model to recycled concrete model is high.When the RA substitution rate is 0.5%~1.5%,the bending toughness of 50%is better than that of 100%.

关 键 词：再生混凝土 抗压强度 本构模型 弯曲韧性 

分 类 号：TU528.572[建筑科学—建筑技术科学]