机制砂混凝土应力-应变试验研究  

Stress-Strain Test of Manufactured Sand Concrete

作　　者：谢开仲 刘振威 盖炳州 朱茂金 新赢 XIE Kaizhong;LIU Zhenwei;GE Bingzhou;ZHU Maojin;XIN Ying(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,南宁530004

出　　处：《硅酸盐通报》2020年第12期3823-3831,共9页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51738004,51868007,51368005,51878186);广西科技计划(桂科AD17195096);四川省科技计划(2018GZ0052);广西大学科学研究基金(XBZ100762)。

摘　　要：为研究机制砂混凝土单轴应力状态下的力学性能,通过对0%、4%、8%、12%、16%、20%(质量分数)六种石粉含量,C20、C30和C40三类强度等级的机制砂混凝土棱柱体试件进行单轴抗压试验,并与河砂混凝土进行对比,获得了其在单轴受压下的应力-应变全曲线,拟合得到了适用于机制砂混凝土单轴受压的本构方程,结果表明:机制砂混凝土应力-应变曲线变化趋势和河砂混凝土基本相似,在曲线的上升段,机制砂混凝土与河砂混凝土基本重合,但在曲线下降段,机制砂混凝土比较陡峭;随着石粉含量的增加,机制砂混凝土试件的峰值应力和峰值应变都呈现出先增加后减小的趋势,当石粉质量分数为8%时,三种不同强度等级的机制砂混凝土峰值应变均达到最大;机制砂混凝土峰值应力和弹性模量均随着混凝土设计强度等级的提高而增大;基于Sargin模型拟合得到的机制砂混凝土应力-应变全曲线与试验全曲线吻合性较好。In order to study the mechanical properties of manufactured sand concrete(MSC)under uniaxial load.The prism specimens of MSC were tested with the stone powder content(0%,4%,8%,12%,16%and 20%,mass fraction)and the concrete design strength grade(C20,C30 and C40)as variable parameters the compressive complete stress-strain curves were investigated and the uniaxial compression constitutive equations of MSC were fitted,compared with the river sand concrete(RSC).The results indicate that the stress-strain curves of MSC are similar with that of RSC.In the rising stage of the curve,MSC and RSC have basically coincident curve.However,in descending stage,the curves of MSC are much steeper than RSC.In addition,the peak stress and peak strain of the MSC specimens increase firstly and then decrease with the increase of stone powder content.When the mass fraction of stone powder is 8%,the peak strain of three different strength grades of MSC reaches the maximum value.The peak stress and elastic modulus of MSC increase with the increase of concrete design strength grade.The complete stress-strain curve of MSC based on the model of Sargin is in good agreement with the test curve.

关 键 词：机制砂混凝土 河砂混凝土 单轴受压 石粉含量 应力-应变全曲线 

分 类 号：TU528[建筑科学—建筑技术科学]