摘要
Abstract
In order to study the mechanism of durability degradation of reinforced concrete under freeze-thaw corrosion,in this paper,the open circuit potential changes during passivation and depassivation were tested,and the effects of chloride ion erosion time and corrosion rate on me-chanical properties and bond strength of concrete were analyzed.The results show that the surface passivation film is basically formed after the steel bar is soaked in the simulated concrete solution for 5 days.When the chloride concentration reaches 0.07 mol/L,the passivation film on the steel bar surface is completely destroyed.The damage of the coupling effect of freeze-thaw and chloride erosion on the concrete properties is much greater than that of the single factor.After 200 cycles,the compressive strength of the chlorine-eroded specimens for 19 days decrea-ses by 14.01%compared with that of the non-eroded specimens.The bonding stress of 9%corroded specimens is 31.31%lower than that of non-corroded specimens,which provides an important reference for corrosion protection of steel bars induced by chlorine salts.关键词
钢筋混凝土/冻融循环/氯盐侵蚀/耐久性Key words
Reinforced concrete/Freeze-thaw cycle/Chlorine salt erosion/Durability分类
交通工程
