钢纤维再生混凝土三轴受压力学性能试验  

Experiment on mechanical properties of steel fiber recycled aggregate concrete under triaxial compression

作　　者：陈宇良[1,2] 吉云鹏 陈宗平 叶培欢 吴辉琴 CHEN Yuliang;JI Yunpeng;CHEN Zongping;YE Peihuan;WU Huiqin(College of Civil Engineering and Architecture,Guangxi University of Science and Technology,Liuzhou 545006,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China;Guangxi Key Laboratory of Disaster Prevention and Mitigation and Engineering Safety,Nanning 530004,China)

机构地区：[1]广西科技大学土木建筑工程学院,柳州545006 [2]华南理工大学土木与交通学院,广州510641 [3]广西防灾减灾与工程安全重点实验室,南宁530004

出　　处：《复合材料学报》2022年第8期4005-4016,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51908141);中国博士后科学基金(2021M693854);广西科技基地和人才专项(AD19110068);广西高校中青年教师科研基础能力提升项目(2019KY0361);广西重点实验室开放课题项目(2019ZDK038)。

摘　　要：为了研究钢纤维再生混凝土(SFRAC)的三轴受压力学性能,以侧向围压、再生骨料取代率和钢纤维体积掺量为参数,设计了168个圆柱体试件进行常规三轴受压试验。试验观察了SFRAC的破坏形态,获取了应力-应变全曲线、峰值应力、峰值应变、弹性模量等重要指标,深入分析了不同变化参数对其力学性能的影响规律。结果表明,三轴受压下试件主要发生斜向劈裂破坏;随着围压值增大,应力-应变曲线峰部抬高,下降段变缓,峰值应力、峰值应变和弹性模量均显著增大;钢纤维可提高试件单轴受压时的残余强度,使其应力-应变曲线的下降段变缓;再生骨料取代率增加,试件的峰值应力与弹性模量降低,峰值应变增大;三轴受压状态下,钢纤维对SFRAC的峰值应力影响不大,钢纤维体积分数为1vol%时对SFRAC变形性能的改性效果最优。最后,提出了SFRAC三向受压时峰值应力、峰值应变及弹性模量的计算公式。In order to study the mechanical properties of steel fiber recycled aggregate concrete(SFRAC)under triaxial compression,168 cylinder specimens were tested by considering the parameters of the lateral confining pressure,the replacement rate of recycled coarse aggregate and the volume fraction of steel fiber.The failure pattern of the specimens was observed in the test.The stress-strain curve,peak stress,peak strain and elastic modulus were obtained.Based on the test data,the influence of different parameters on the mechanical performance was analyzed.The results show that under triaxial compression,the specimens are destroyed by oblique splitting.With the increase of confining pressure,the peak of stress-strain curve increases,while the descending section becomes slower,the peak stress,peak strain and elastic modulus of SFRAC all increase significantly.Steel fiber increases the residual strength of the specimen under uniaxial compression and makes the descending section of the stress-strain curve slow down.With the increase of the replacement rate of recycled coarse aggregate,the peak stress and elastic modulus decrease and the peak strain increases.Under triaxial compression,the steel fiber has little effect on the peak stress of SFRAC,and when the volume fraction of steel fiber is 1vol%,the improvement effect on the deformation performance of SFRAC is optimal.Finally,the formulas for calculating the peak stress,peak strain and elastic modulus of SFRAC under triaxial compression are put forward.

关 键 词：三轴受压 钢纤维再生混凝土 峰值应力 峰值应变 弹性模量 

分 类 号：TU528[建筑科学—建筑技术科学]