薛刚, 赵玉杰, 周海峰, 孙立所. 钢渣粗骨料混凝土单轴受压应力-应变关系试验研究[J]. 工程力学, 2022, 39(5): 86-95. DOI: 10.6052/j.issn.1000-4750.2021.01.0053
引用本文: 薛刚, 赵玉杰, 周海峰, 孙立所. 钢渣粗骨料混凝土单轴受压应力-应变关系试验研究[J]. 工程力学, 2022, 39(5): 86-95. DOI: 10.6052/j.issn.1000-4750.2021.01.0053
XUE Gang, ZHAO Yu-jie, ZHOU Hai-feng, SUN Li-suo. EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES AND CONSTITUTIVE RELATIONSHIP OF STEEL SLAG AGGREGATE REINFORCED CONCRETE[J]. Engineering Mechanics, 2022, 39(5): 86-95. DOI: 10.6052/j.issn.1000-4750.2021.01.0053
Citation: XUE Gang, ZHAO Yu-jie, ZHOU Hai-feng, SUN Li-suo. EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES AND CONSTITUTIVE RELATIONSHIP OF STEEL SLAG AGGREGATE REINFORCED CONCRETE[J]. Engineering Mechanics, 2022, 39(5): 86-95. DOI: 10.6052/j.issn.1000-4750.2021.01.0053

钢渣粗骨料混凝土单轴受压应力-应变关系试验研究

EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES AND CONSTITUTIVE RELATIONSHIP OF STEEL SLAG AGGREGATE REINFORCED CONCRETE

  • 摘要: 为探究钢渣粗骨料混凝土稳定性及其应力-应变关系全曲线,该文对包头某钢铁公司的钢渣粗骨料进行了浸水膨胀率试验及压蒸粉化率试验并测其f-CaO含量;完成了6组不同钢渣替代率下的立方体抗压试验及棱柱体单轴受压试验,分析其破坏形态及受力变形特征,建立钢渣粗骨料混凝土本构关系模型。研究表明:该文所选钢渣的f-CaO含量、浸水膨胀率、压蒸粉化率均符合现行规范规定,稳定性良好;钢渣粗骨料混凝土单轴抗压强度随钢渣掺量的增加而提高,并高于普通混凝土抗压强度,破坏呈现的脆性特征也更为显著;钢渣粗骨料混凝土棱柱体抗压强度与立方体抗压强度的比值相较于普通混凝土更高。根据过镇海本构模型及Wee模型,并引入钢渣粗骨料含量的修正系数,对钢渣粗骨料混凝土应力-应变关系采用分段式表达。该文提出应力-应变模型与试验结果拟合程度较好,可以更加全面的描述钢渣粗骨料混凝土的单轴受压力学行为。

     

    Abstract: In order to study the stability and stress-strain relationship of steel slag coarse aggregate concrete, the water immersion expansion rate and autoclaved pulverization rate of steel slag coarse aggregate of a steel company in Baotou were experimentally determined and the content of free CaO was tested. Six groups of cubic compression tests and prismatic uniaxial compression tests under different slag replacement rates were completed to analyze their failure modes and deformation characteristics, and establish the constitutive model of steel slag coarse aggregate concrete. The results show that the free CaO content, the water immersion expansion rate and the autoclaved pulverization rate of steel slag used in the test meet the requirements of relevant specifications with excellent stability. The uniaxial compressive strength of steel slag coarse aggregate concrete rises with the increase of steel slag content, and is higher than that of ordinary concrete, presenting more obvious failure brittleness. The ratio of prism compressive strength to cube compressive strength of steel slag coarse aggregate concrete is also higher than that of ordinary concrete. According to the constitutive model by Guo Zhenhai and the Wee model, the constitutive relationship of steel slag coarse concrete can be described in sections with consideration of the correction coefficient of steel slag coarse aggregate content. The stress-strain model is in good agreement with the test results and can be used to describe the mechanical behavior of steel slag coarse aggregate concrete under uniaxial compression more comprehensively.

     

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