粉煤灰陶粒轻骨料混凝土弹性模量试验研究  

Experimental research on elastic modulus of fly ash ceramsite lightweight aggregate concrete

作　　者：朱玲 吴辉琴[1] 岑钒浬 史方宇 陈宇良[1] ZHU Ling;WU Huiqin;CEN Fanli;SHI Fangyu;CHEN Yuliang(School of Civil Engineering and Architecture,Guangxi University of Science and Technology,Liuzhou 545006,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006

出　　处：《广西科技大学学报》2021年第2期26-32,共7页Journal of Guangxi University of Science and Technology

基　　金：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);广西水工程材料与结构重点实验室资助课题(GXHRI-WEMS-2020-05);国家级(广西)大学生创新创业训练计划项目(202010594179)资助.

摘　　要：为研究粉煤灰陶粒轻骨料混凝土弹性模量的变化规律,以不同强度等级、不同骨料浸泡时间为影响参数,完成了54个轻骨料混凝土试块的立方体抗压强度、轴心抗压强度和弹性模量试验.试验观察其破坏形态,分析各参数对弹性模量的影响情况,并与现有的国内外规范中关于弹性模量的计算公式结果作对比分析.研究结果表明:轴心抗压破坏形态为斜剪破坏,受变化参数的影响不大;在同组试件中,弹性模量的应力-应变曲线峰值基本低于轴心抗压强度的曲线峰值;骨料浸泡时间越长,强度等级越大,轻骨料混凝土的弹性模量越大;所采用规范的弹性模量计算公式的计算值均比轻骨料混凝土试验值大.并根据试验数据提出了该类混凝土的弹性模量计算式,拟合结果良好.To explore the changes in the elastic modulus of fly ash ceramsite lightweight aggregate concrete,54 specimens of lightweight aggregate concrete were made to test the axial compressive strength,cube compressive strength and the elastic modulus of different strength grades and different aggregate soaking times.The experiment observes the failure behavior and analyzes the influence of various parameters on the elastic modulus,and compares the results with the existing domestic and foreign codes regarding the elastic modulus recommendations.The results show that the compression failure behavior of axial compression is oblique shear failure,which is less affected by various influencing factors;the peak value of the stress-strain curve of the elastic modulus test in the same group of specimens is basically lower than the peak value of the axial compressive strength curve;the greater the strength level and the longer the aggregate soaking time,the greater the strength of lightweight aggregate concrete;the elastic modulus values of fly ash ceramsite concrete obtained by the existing elastic modulus calculation formula are all too large.And the elastic modulus calculation formula of this type of concrete is proposed based on the experimental data,and the fitting results are great.

关 键 词：轻骨料混凝土 粉煤灰陶粒 弹性模量 抗压强度 强度等级 

分 类 号：TU528.041[建筑科学—建筑技术科学]