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采用外加直流电场和内掺氯化钠的方法模拟杂散电流和氯离子共存的腐蚀环境,研究了杂散电流与氯离子共存环境下钢筋锈蚀特征及其对混凝土强度的影响.结果表明:二者共存时对混凝土耐久性的危害远大于杂散电流单独作用;当二者共存时,钢筋锈蚀程度明显增加,钢筋由钝化状态到严重腐蚀状态时间大幅度缩短,且受腐蚀钢筋的电化学当量和腐蚀电流密度随着电流强度增大、氯离子浓度升高以及腐蚀时间延长而增大;同时,该条件下混凝土力学性能受损较为严重,其下降程度与钢筋锈蚀程度有关.
The effects of stray current and chloride ion coexisting corrosion environment were simulated by applying DC field and sodium chloride mixed in. The corrosion characteristics of steel bar under the coexistence of stray current and chloride ion and its influence on the concrete strength were studied.The results showed that: When they coexist, the damage to concrete durability is far greater than the stray current alone. When the two coexist, the corrosion degree of steel bar increases obviously, the time of steel bar from passive state to serious corrosion state is greatly shortened, The equivalent current density and corrosion current density increase with the increase of current density, chloride ion concentration and corrosion time. At the same time, the mechanical properties of concrete under this condition are seriously damaged, and the degree of reduction is related to the corrosion degree of steel bars.