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采用Φ100mm分离式霍普金森压杆试验装置,研究了受硫酸钠溶液浸泡腐蚀后混凝土的动态力学性能,并结合SEM分析了性能弱化机理。试验结果表明:受腐蚀后混凝土的动态抗压强度受到一定程度的削弱,且具有显著的应变率效应,同时,动态抗压强度损失量随应变率的提高而增大;混凝土的冲击压缩变形性能下降,且极限应变的应变率敏感性较强,而峰值应变与应变率无明显线性相关性;分析冲击韧性指标可知,腐蚀后的混凝土在抵抗外荷载作用时的吸能能力下降,且冲击韧性的损失量随着应变率的升高而增大;通过扫描电镜微观观察及机理分析可知,混凝土受硫酸钠溶液腐蚀后,内部结构遭到破坏,其强度、变形性能及吸能能力等动态力学性能均有所下降。
The Φ100mm split Hopkinson pressure bar test apparatus was used to study the dynamic mechanical properties of concrete after being soaked in sodium sulfate solution. The weakening mechanism was also analyzed by SEM. The experimental results show that the dynamic compressive strength of concrete after corrosion is weakened to a certain degree and has significant strain rate effect. Meanwhile, the loss of dynamic compressive strength increases with the increase of strain rate. The impact compression deformation of concrete And the strain rate of ultimate strain is sensitive to strain rate, while the peak strain and strain rate have no significant linear correlation. Analyzing the impact toughness index shows that the energy absorption capacity of concrete after corrosion is decreased under the action of external load, and the impact toughness The loss increases with the increase of strain rate. By scanning electron microscopy and mechanical analysis, it can be seen that the internal structure of the concrete is damaged by sodium sulfate solution and its dynamic properties such as strength, deformation and energy absorption Performance has declined.