三轴受压粉煤灰陶粒轻骨料混凝土力学性能试验  

Experiment study on mechanical properties of fly ash ceramsite lightweight aggregate concrete under triaxial compression

作　　者：陈宇良[1,2] 朱玲 吉云鹏 吴辉琴 叶培欢[1] CHEN Yuliang;ZHU Ling;JI Yunpeng;WU Huiqin;YE Peihuan(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)

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

出　　处：《复合材料学报》2022年第10期4801-4812,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);广西研究生教育创新计划项目(YCSW2021319)。

摘　　要：以粉煤灰陶粒轻骨料浸泡时间、强度等级、侧向围压为变化参数,共设计120个粉煤灰陶粒轻骨料混凝土试件进行常规三轴受压试验,研究其在三轴应力状态下的力学性能。试验观察了轻骨料混凝土的破坏过程及破坏形态,获取了三轴受力状态下的应力-应变全过程曲线,分析了各变化参数对其三轴受压力学性能的影响规律。研究结果表明:随着围压值的增大,试件破坏由竖向劈裂破坏变为斜向剪切破坏,当围压值大于12 MPa时,试件则表现为外表无明显裂缝的鼓起破坏;应力-应变曲线受围压值影响较大,受骨料浸泡时间和强度等级的影响较小,围压值大于12 MPa后,曲线不再出现下降段;峰值应力随骨料浸泡时间、强度等级、侧向围压的增大而增大;峰值应变受陶粒浸泡时间的影响不大,随强度等级的增大而减小,随围压值的增大而增大;弹性模量随强度等级和围压值的增大而增大,受骨料浸泡时间的影响不显著。A total of 120 specimens of fly ash ceramsite lightweight aggregate concrete were designed for conventional triaxial compression tests in order to reveal the mechanical properties and behavior under complex stress conditions with ceramsite soaking time,strength level and lateral confining pressure as the changing parameters.The failure process and final failure behavior of flyash ceramsite lightweight aggregate concrete under triaxial compression were observed,the stress-strain curves of specimens were obtained,and the influence of changing parameters on the mechanical performances was analyzed.The experimental results show that with the increase of the confining pressure,the failure behavior of fly ash ceramsite lightweight aggregate concrete changes from vertical splitting failure to oblique shear failure.When the confining pressure value is greater than 12 MPa,the specimen shows bulging failure without obvious cracks.The stress-strain curve is greatly affected by the value of confining pressure,but less affected by the immersion time and strength grade of the concrete.And after the confining pressure is greater than 12 MPa,the curve no longer has a descending section.The peak stress increases with the increase of ceramsite immersion time,strength grade and lateral confining pressure.The peak strain is not greatly affected by the soaking time of the ceramsite,it decreases with the increase of the strength grade,and increases with the increase of the confining pressure value.The elastic modulus increases with the increase of the strength grade and the confining pressure value,and is not significantly affected by the soaking time of the ceramsite.

关 键 词：粉煤灰 高强陶粒 轻骨料混凝土 三轴受压 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程]