受硫酸钠腐蚀后混凝土动态力学性能研究

发布时间：2018-04-07 15:40

本文选题：硫酸钠腐蚀　切入点：分离式霍普金森压杆　出处：《建筑科学》2017年01期

【摘要】：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。
[Abstract]:Using a 100mm diameter split Hopkinson pressure bar test device to study the dynamic mechanical properties of concrete in sodium sulfate solution by immersion corrosion, and analyzed with SEM performance weakening mechanism. The experimental results show that the dynamic compressive strength of concrete has been weakened by corrosion, and has obvious strain rate effect, at the same time, dynamic the loss of compressive strength with strain rate increases; the impact of concrete compressive deformation and strain performance, ultimate strain rate sensitivity is strong, while the peak strain and strain rate had no obvious linear correlation analysis; impact toughness index shows that the corrosion resistance in concrete after load when the energy absorption capacity decreased, and the impact the loss of toughness increases with the increase of strain rate; through the scanning electron microscope observation and mechanism analysis of concrete in sodium sulfate solution after corrosion, internal The structure has been destroyed, and its dynamic mechanical properties, such as strength, deformability and energy absorption capacity, are all decreased.

【作者单位】：空军工程大学机场建筑工程系;西北工业大学力学与土木建筑学院;
【基金】：国家自然科学基金资助项目(51208507,51378497) 陕西省青年科技新星项目(KJXX-81)
【分类号】：TU528

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