杂散电流与复合离子作用下埋地碱激发矿渣混凝土中钢筋锈蚀研究  

Corrosion of Steel Reinforcement in Buried Alkali-Activated Slag Concrete under Stray Current and Complex Ion Action

作　　者：李祥翔 金祖权[1] 逄博 LI Xiangxiang;JIN Zuquan;PANG Bo(School of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266520

出　　处：《硅酸盐通报》2024年第10期3595-3606,共12页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金面上项目(52078259)。

摘　　要：沿海地铁等地下工程混凝土在杂散电流与腐蚀离子复合作用下易发生钢筋锈蚀。本文针对普通混凝土和碱激发矿渣混凝土,采用实时应变监测、电化学阻抗测试和微观分析等方法,探究了杂散电流作用下,钢筋在不同腐蚀环境中的腐蚀行为。结果表明,混凝土中钢筋呈点蚀行为,钢筋锈蚀产物的化学组成不受腐蚀离子以及混凝土类型影响。碱激发混凝土钢筋腐蚀速率低于普通混凝土,钢筋脱钝与混凝土锈胀开裂时间相对滞后。随着盐渍土中硫酸根离子增加,钢筋混凝土的锈胀开裂时间和锈胀开裂力呈先增大后减小的趋势,硫酸根离子延缓了氯盐导致的钢筋锈蚀。The corrosion of steel reinforcement in underground engineering concrete,such as that found in coastal subways,is susceptible to occurring under the combined influences of stray current and corrosion ions.The corrosion behavior of steel reinforcement in different environments was studied.The real-time strain monitoring,electrochemical impedance spectroscopy(EIS),and microscopic analysis were employed for both ordinary Portland cement(OPC)concrete and alkali-activated slag(AAS)concrete.The results show that the steel reinforcement in concrete undergoes pitting corrosion.The chemical composition of corrosion products formed in the steel reinforcement appears to be unaffected by the type of concrete or the presence of corrosion ions.Furthermore,the corrosion rate observed in AAS concrete is found to be lower than that in OPC.Additionally,the time of deactivation of steel reinforcement and concrete rust expansion cracking is relatively logging behind.As the concentration of sulfate ions in saline soil increases,the rust cracking time and rust cracking force of steel reinforcement concrete increase first and then decrease.This suggests that sulfate ions have a mitigating effect on the corrosion rate of steel reinforcement induced by chloride salts.

关 键 词：碱激发矿渣混凝土 杂散电流 复合离子 钢筋锈蚀 电化学阻抗 锈胀应力 

分 类 号：TU528[建筑科学—建筑技术科学]