Failure mechanism and numerical simulation of High titanium heavy slag concrete
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摘要: 进行了高钛重矿渣混凝土和普通混凝土配合比试验设计，分别制作了4组混凝土立方体试块和棱柱体试块并进行强度测试，通过PFC离散元软件标定了高钛重矿渣混凝土与普通混凝土试件的细观力学参数，模拟了高钛重矿渣混凝土和普通混凝土棱柱体试件受压破坏，分析了高钛重矿渣混凝土棱柱体试件破坏现象和破坏机理。研究结果表明,高钛重矿渣骨料内部的孔洞会削弱骨料的强度；高钛重矿渣骨料的粗糙表面会提高界面过渡区的粘结强度；高钛重矿渣混凝土破坏形态与普通混凝土破坏形态不一致，高钛重矿渣混凝土破坏时形成的破坏面会穿越骨料与硬化砂浆，而普通混凝土破坏时形成的破坏面会沿着界面过渡区穿越硬化砂浆。Abstract: The mix proportion of high titanium heavy slag concrete (HTHS) and normal concrete was designed. Four groups of concrete cubic and prism specimens were made and tested. Using the PFC discrete element software, the meso-structure mechanical parameters of HTHS and normal concrete specimen were calibrated. Uniaxial compressive tests of prism-shaped specimens made of HTHS and normal concrete were simulated. Furthermore, the failure phenomena and reasons of HTHS concrete prism specimens were analyzed. It is found that the strength of HTHS aggregate is decreased due to the holes within HTHS aggregate. The bonding strength of the interface transition zone between coarse aggregate and harden mortar is improved. In addition, the failure modes of HTHS and normal concrete are different. The failure surfaces of HTHS concrete pass through the coarse aggregate and hardened mortar, while the failure surfaces of normal concrete can only develop along the interface transition zone and pass through the harden mortar.
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图 6 混凝土立方体试件抗压应力应变曲线对比
Figure 6. Compressive stress-strain curves of concrete cubic specimen
表 1 试验基准配合比
Table 1. Experimental benchmark of mix proportion
标号 水胶比 水泥/kg 水/kg 渣石/kg 渣砂/kg 碎石/kg C35 z 0.56 480 267.8 955.1 913.7 C35 s 0.52 480 251.3 913.7 947 注：C35 z的粗骨料为高钛重矿渣，C35 s的粗骨料为石灰石。 
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表 2 强度对比
Table 2. Strength comparison
试件编号 立方体抗压强度/MPa 棱柱体抗压强度/MPa z-1 41.56 35.95 z-2 39.57 34.46 s-1 36.89 29.54 s-2 36.21 29.27
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表 3 高钛重矿渣混凝土细观参数
Table 3. Meso-structure parameters of HTHS concrete
颗粒弹性刚度
模量/GPa抗拉强度/
MPa粘聚力/
MPa刚度比 水泥浆 14 9 19 1.0 高钛重矿渣骨料 12 6 15.5 1.0 界面过渡区 10 6 13 1.0
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表 4 普通石灰石混凝土细观参数
Table 4. Meso-structure parameters of normal limestone concrete
颗粒弹性刚度
模量/GPa抗拉强度/
MPa粘聚力/
MPa刚度比 水泥浆 14 9 19 1.0 普通石灰石骨料 12 13.5 35 1.0 界面过渡区 10 4 10 1.0
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