Dynamic constitutive model of concrete after salt corrosion
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摘要: 为探究混凝土受盐腐蚀后的动态力学响应，配置了粉煤灰质量分数为15%的普通硅酸盐水泥混凝土，将其置于质量分数均为15%的NaCl和Na2SO4溶液中浸泡腐蚀60 d后，利用∅100 mm分离式霍普金森压杆实验装置，测试其受腐蚀后的动态力学性能，并结合宏观唯象损伤统计理论和Weibull分布思想，建立了混凝土受盐腐蚀后的动态统计损伤本构模型。结果表明：受盐腐蚀后，混凝土试件的动态抗压强度均有不同程度的下降，且NaCl溶液腐蚀试件的降幅大于Na2SO4溶液腐蚀试件；模型曲线与实验曲线的拟合度较高，能够较准确地描述混凝土在冲击荷载作用下的动态力学响应规律。Abstract: To explore the dynamic mechanical behaviors of the concrete corroded by salt solution, we fabricated concrete specimens of ordinary Portland cement with fly ash of 15% mass fraction and, having them immersed for 60 d in NaCl and Na2SO4 solutions with a 15% mass fraction, studied their dynamic mechanical properties using a ∅100 mm split Hopkinson pressure bar apparatus. Then, based on the macro phase-only statistical damage theory and the Weibull distribution theory, we built a dynamic statistical damage constitutive model for the specimen's mechanical behaviors. The results indicate that the dynamic compressive strength of the corroded specimens experiences a significant decrease, and the declines of the specimens corroded by NaCl are bigger than those corroded by Na2SO4. Based on the closely fitted curves of the model and the experiment, this established model can accurately estimate the dynamic mechanical behaviors of concrete under impact loading.
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Key words:
- salt corrosion /
- concrete /
- dynamic compressive strength /
- damage theory /
- Weibull distribution /
- constitutive model
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图 1 3组混凝土试样的动态应力-应变曲线
Figure 1. Dynamic stress-strain curves of three groups of concrete specimens
图 3 动态强度增长因子-平均应变率对数曲线
Figure 3. Dynamic increase factor vs. the logarithm of average strain rate
表 1 混凝土配合比
Table 1. Mix proportions of concrete
kg/m3 水泥 水 灞河中砂 石灰岩碎石 粉煤灰 338 215 643 1 144 60 
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表 2 不同应变率下模型参数
Table 2. Model parameters at different strain rates
样品组 ${\bar {\dot \varepsilon }}$/s-1 a/10-5 m 样品组 ${\bar {\dot \varepsilon }}$/s-1 a/10-5 m 样品组 ${\bar {\dot \varepsilon }}$/s-1 a/10-5 m 55.07 3.68 0.162 62.73 13.01 0.190 29.45 0.04 0.102 67.86 20.61 0.211 81.05 57.64 0.285 51.76 0.24 0.110 N 78.63 6.72 0.173 S1 92.98 11.05 0.171 S2 62.79 1.19 0.145 91.41 0.10 0.094 102.95 2.17 0.096 73.37 4.52 0.169 109.43 171.01 0.431 111.77 12.89 0.146 116.58 20.31 0.212
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表 3 动态强度增长因子与平均应变率对数的关系
Table 3. Relation of dynamic compressive strength increase factor with the logarithm of average strain rate
样品组 拟合公式 转换后的拟合公式 C N I=-3.316 8+2.480 2 lg ${\bar {\dot \varepsilon }}$ I=1-0.747 8 lg ${\bar {\dot \varepsilon }}$ -0.747 8 S1 I=-3.620 5+2.691 7 lg ${\bar {\dot \varepsilon }}$ I=1-0.743 5 lg ${\bar {\dot \varepsilon }}$ -0.743 5 S2 I=-1.203 1+1.426 1 lg ${\bar {\dot \varepsilon }}$ I=1-1.185 4 lg ${\bar {\dot \varepsilon }}$ -1.185 4
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