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为了研究混凝土结构在双重侵蚀环境中的退化规律,采用内掺5%NaCl浸泡于15%Na2SO4溶液中,湿2d、干3d的干湿循环加速腐蚀方法,研究了不同腐蚀损伤度和锈蚀率时试验梁的破坏形态、开裂情况、抗弯承载力的退化机理,并对不同腐蚀程度下试验梁的荷载-挠度曲线、挠度变形、腐蚀损伤度和锈蚀率对开裂荷载、极限荷载和延性的影响进行了分析.结果表明:早期侵蚀产物的生成密实了混凝土内部结构,随着腐蚀的加深,混凝土和钢筋的力学性能均下降,因此造成试验梁的开裂荷载、极限荷载、延性和截面刚度都经历了先增后降的过程,但是相对于开裂荷载,极限荷载的下降要晚些.根据试验结果建立了与腐蚀损伤度和锈蚀率相关的开裂荷载、极限荷载和延性比退化规律的计算模型.
In order to study the degradation regularity of concrete structure in double erosion environment, the accelerated corrosion was accelerated by wet-dry cycle with 5% NaCl immersed in 15% Na2SO4 solution for 2 days and dry days, and the effects of different corrosion damage degree and corrosion rate The failure mode of the test beam, the cracking condition and the degradation mechanism of the flexural capacity, and the influence of the load-deflection curve, deflection, corrosion damage and corrosion rate on the cracking load, ultimate load and ductility of the test beam under different corrosion degrees The results show that the formation of early corrosion products compacts the internal structure of concrete, and the mechanical properties of concrete and steel bar decrease with the deepening of corrosion, so the cracking load, ultimate load, ductility and cross-section stiffness of the test beam all experience However, relative to the cracking load, the ultimate load declines more.A calculation model of the cracking load, the ultimate load and the ductility ratio degradation rule is established based on the experimental results.