硅酸盐学报2011，Vol.39Issue(6)：1022-1027,6.
冻融循环-氯盐侵蚀-荷载耦合作用下混凝土中钢筋的锈蚀行为
Corrosion Behavior of Steel Bar Embedded in Concrete Subject to Freeze-Thaw Cycles-Chloride Attack-Flexural Load
摘要
Abstract
Corrosion behavior of steel bars embedded in pavement concrete subject to synergistic effect of freeze-thaw cycles, chloride salt attack and external loading was studied. The corrosion behavior of steel bars was evaluated by measuring corrosion potential,corrosion current density and corrosion rate using open circuit potential and potentiodynamic polarization techniques. Results show that depassivation time of steel bar subject to a 0.4 stress ratio is more than 50 cycles earlier than that of the steel bar with a 0.3 stress ratio. High stress ratio shortens depassivation time of the steel bar and increases risk of steel corrosion. The cathodic reaction was inhibited with negative shift of polarization curve. Dissolution resistance of the steel bars decreases and the corrosion reaction takes place toward the direction of easy-to-corrode after the depassivation of the steel bar. Corrosion rate is closely related to corrosion current density icorr. After 100 freeze-thaw cycles, the results of icorr and corrosion rate show that the steel corrosion will occur in 10-15 years and the time from corrosion initiation to corrosion cracking is about 2 years.关键词
多因素耦合/钢筋锈蚀/腐蚀速率/服役寿命Key words
multi-factor coupling/ steel corrosion/ corrosion rate/ service life分类
建筑与水利引用本文复制引用
王阵地,姚燕,王玲..冻融循环-氯盐侵蚀-荷载耦合作用下混凝土中钢筋的锈蚀行为[J].硅酸盐学报,2011,39(6):1022-1027,6.基金项目
国家"973"计划(2009CB623106)资助项目. （2009CB623106）
