铁尾矿砂混凝土的应力应变全曲线特性  

Stress-strain full curve characteristics of iron tailing sand concrete

作　　者：宁宝宽 徐永泽 崔琨 王宁 NING Bao-kuan;XU Yong-ze;CUI Kun;WANG Ning(School of Architecture and Civil Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学建筑与土木工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2021年第5期573-578,共6页Journal of Shenyang University of Technology

基　　金：辽宁省教育厅基金项目(LFGD2017010).

摘　　要：针对不同铁尾矿砂掺量对混凝土应力应变全曲线的影响,对5组不同铁尾矿砂掺量的棱柱体试件进行单轴受压应力应变全曲线试验.结果表明:铁尾矿砂混凝土的破坏形态与普通混凝土基本相同,铁尾矿砂混凝土轴心抗压强度低于普通混凝土,当铁尾矿砂掺量为60%时,轴心抗压强度与普通混凝土相差最小;随着铁尾矿砂掺量的增加,混凝土刚度下降,抵抗弹性变形能力减弱,脆性增强;铁尾矿砂混凝土的应力应变曲线分为上升段和下降段,通过拟合相关参数,提出了应力应变全曲线方程表达式,拟合结果与试验数据较吻合.Aiming at the influence of different iron tailing sand contents on the stress-strain full curve of concrete,the uniaxial compressive stress-strain full curve tests for five sets of prismatic specimens with different iron tailing sand contents were performed.The results show that the failure mode of iron tailing sand concrete is basically the same as that of ordinary concrete.The axial compressive strength of iron tailing sand concrete is lower than that of ordinary concrete.When the iron tailing sand content is 60%,the axial compressive strength has the smallest difference with that of ordinary concrete.With the increase of iron tailing sand content,the concrete stiffness decreases,the resistance to elastic deformation is weakened,and the brittleness is enhanced.The stress-strain full curve of iron tailing sand concrete can be divided into the ascending and the descending sections,and the stress-strain full curve equation expression is proposed through the fitting of relevant parameters.The fitting results are in good agreement with the experimental data.

关 键 词：铁尾矿砂混凝土 铁尾矿砂掺量 轴心受压试验 抗压强度 破坏形态 单轴受压应力应变全曲线 拟合曲线 应力应变全曲线方程 

分 类 号：TU502[建筑科学—建筑技术科学]