Experimental Study on Stress-Strain Relationship of Steel Slag Fine Aggregate Concrete Under Uniaxial Compression
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摘要:
为研究钢渣细骨料在混凝土中的适用性及钢渣细骨料混凝土的轴压本构模型，进行了钢渣细骨料的物理化学性能试验，并对钢渣细骨料的稳定性进行测试分析；在此基础上，制备了6组不同钢渣细骨料掺量的钢渣混凝土立方体及棱柱体试件，研究了钢渣细骨料混凝土的单轴受压性能. 研究结果表明：本文选用钢渣的游离氧化钙含量、压蒸粉化率均满足相关规范要求，适用于混凝土细骨料；钢渣细骨料混凝土破坏的脆性特征更加明显，比普通混凝土的抗压强度有明显提高；钢渣混凝土棱柱体抗压强度与立方体抗压强度比值为0.80 ~ 0.86；可依据Carreira and Chu模型及Wee模型对钢渣混凝土本构关系进行分段描述，分段式本构模型与实测钢渣细骨料混凝土的应力-应变曲线基本吻合.
Abstract:In order to study the applicability of steel slag fine aggregate in concrete and the Axial compression constitutive model of steel slag concrete, the physical and chemical properties of steel slag fine aggregate were tested and the stability of steel slag fine aggregate was tested and analyzed. Six groups of steel slag concrete cube and prism specimens with different steel slag fine aggregate content were prepared, and the uniaxial compression performance of steel slag concrete was studied. The results show that the free calcium oxide and autoclaved pulverization rate of steel slag selected in this paper meet the requirements of relevant specifications and are suitable for concrete aggregate. The brittle characteristics of steel slag fine aggregate concrete are more obvious, which is significantly improved than ordinary concrete. The ratio of prism compressive strength of steel slag concrete to cube compressive strength is 0.80−0.86. The constitutive relationship of steel slag concrete can be described in sections according to the Carreira and Chu model and Wee model. The sectional constitutive model is basically consistent with the measured stress-strain curve of steel slag fine aggregate concrete.
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Key words:
- steel slag fine aggregate /
- concrete /
- uniaxial compression /
- constitutive relationship
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图 3 钢渣混凝土棱柱体轴心抗压试验装置
Figure 3. Axial compressive test apparatus for steel slag concrete prisms
图 5 普通混凝土及钢渣细骨料混凝土轴压破坏形态
Figure 5. Failure modes of ordinary concrete and steel slag fine aggregate concrete under axial compression
图 6 钢渣细骨料不同替代率下混凝土单轴受压应力-应变曲线
Figure 6. Stress-strain curves of concrete under uniaxial compression under different substitution rates of steel slag fine aggregate
图 10 上升段参数D与替代率关系
Figure 10. Relationship between the ascending stage parameter D and the substitution rate
图 11 下降段参数与替代率的关系
Figure 11. Relationships between the descending parameters and the substitution rate
图 12 试验曲线与本文建立模型曲线对比
Figure 12. Comparison of test curves and model curves established in this paper
表 1 钢渣主要化学成分
Table 1. Main chemical composition of steel slag
化学成分 CaO SiO2 Al2O3 Fe2O3 MgO f-CaO 其他 质量分数/% 36.5 23.0 9.0 10.0 7.5 1.2 12.8 
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表 2 骨料物理性能指标
Table 2. Physical properties of aggregate
材料 表观密度/
（kg·m−3）细度模数 松散堆积密度/（kg·m−3） 吸水率/% 含水率/% 砂 2601 2.87 1566 0.90 0.50 钢渣细骨料 3440 2.94 1800 3.70 0.25 石子 2681 1450 0.80 0.50
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表 3 钢渣细骨料混凝土配合比
Table 3. Mix proportion of steel slag fine aggregate concrete
kg 试验编号 水泥 粉煤灰 河砂 钢渣细
骨料碎石 水 减水剂 NC 323 57 795.0 0 1054 171 5.7 SSC-10% 715.5 79.5 SSC-30% 556.5 238.5 SSC-50% 397.5 397.5 SSC-70% 238.5 556.5 SSC-100% 0 795.0
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表 4 棱柱体抗压强度与立方体抗压强度
Table 4. Prism compressive strength and cube compressive strength
试验编号 fc(ssc)/MPa fcu(ssc)/MPa fc(ssc)/fcu(ssc) NC 33.4 45.1 0.74 SSC-10% 37.9 47.4 0.80 SSC-30% 39.0 48.9 0.80 SSC-50% 41.8 50.5 0.83 SSC-70% 46.3 53.6 0.86 SSC-100% 41.4 49.2 0.84
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