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碱矿渣混凝土受压应力-应变关系试验研究 被引量:2

Experimental Study on Compressive Stress-strain Relationship of Alkali-activated Slag Concrete
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摘要 为研究碱矿渣混凝土的受压应力-应变关系,分别制作单轴受压混凝土棱柱体标准试件和钢管约束条件钢管混凝土试件,开展单轴受压条件和钢管约束条件下碱矿渣混凝土受压应力-应变关系试验.结果表明:单轴受压条件下,碱矿渣混凝土立方体强度和棱柱体强度关系仍可采用现行规范建议式表示,采用无量纲两段式应力-应变关系模型拟合的单轴受压应力-应变关系与试验曲线结果吻合良好;钢管约束条件下,碱矿渣混凝土极限强度和极限应变均较单轴条件下有了明显提高,表明钢管约束作用能够较好地提高核心混凝土的强度和韧性性能;采用已有钢管约束核心混凝土应力-应变关系模型拟合的应力-应变关系曲线与试验曲线吻合较好.结果表明:现有普通混凝土应力-应变关系模型对单轴受压条件和钢管约束条件下碱矿渣混凝土仍然适用. Standard specimen of uniaxial compression concrete prism and concrete filled stell tube(CFST) specimen were made to investigate the alkali-activated slag concrete(AASC) stress-strain relationship by the testing of uniaxial compression and steel tube constraints conditions.The test results show that the relationship between the cube strength and the prismatic strength can still be expressed by the present standard,and the fitted stress-strain relationship curve with the dimensionless two stage stress-strain relationship model is in good agreement with the test curve under uniaxial compression conditions.The ultimate strength and strain of AASC under steel tube constraints condition are significantly increased than those under uniaxial condition,which indicates that the steel tube confinement can improve the strength and toughness of core concrete,and the fitted stress-strain relationship curve with the stress-strain relationship model of the existing steel tube confined core concrete is in good agreement with the test curve.The results show that the existing stress-strain relation model of ordinary concrete is still applicable to AASC under uniaxial compression and steel tube constraints condition.
作者 袁晓辉 王士革 李永强 闫启方 YUAN Xiaohui;WANG Shige;LI Yongqiang;YAN Qifang(College of Architecture and Civil Engineering,Xinyang Normal University,Xinyang 464000,China)
出处 《信阳师范学院学报(自然科学版)》 CAS 北大核心 2019年第3期492-497,共6页 Journal of Xinyang Normal University(Natural Science Edition)
基金 河南省科技攻关项目(182102310878) 河南省高等学校重点科研项目(18A560020,19B560008)
关键词 碱矿渣混凝土 应力-应变关系 单轴受压 钢管约束 alkali-activated slag concrete stress-strain relationship uniaxial compression steel tube constraints
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