淡化海砂混凝土中钢筋的锈蚀特征  

Corrosion development of steel imbedded in washed sea sand concrete

作　　者：苏卿[1] 陈艾荣[1] 赵铁军[1,2] 

机构地区：[1]同济大学土木工程学院桥梁系,上海200092 [2]青岛理工大学土木工程学院,山东青岛266033

出　　处：《新型建筑材料》2012年第8期48-52,55,共6页New Building Materials

基　　金：交通部西部项目(200631822302)

摘　　要：采用电化学法分析了不同强度等级的海砂混凝土与淡化海砂混凝土内的钢筋锈蚀发展规律。结果表明,随测试龄期延长,2种混凝土内钢筋腐蚀电位的绝对值为先减小后增大,腐蚀电流密度逐渐增大,且相同强度等级的淡化海砂混凝土内钢筋的腐蚀发展明显慢于海砂混凝土。海水侵蚀对钢筋锈蚀的长期影响大于NaCl溶液;此外,虽然海砂引入了氯离子,但外界环境侵入的氯离子仍是引起钢筋锈蚀的主要原因。The electrochemical method was adopted to investigate the corrosion development rule of steel imbedded in sea sand con- crete and washed sea sand concrete with different strength grades. The results show that the developing of absolute corrosion potential has two steps,decrease first then increase, and corrosion current density increases gradually with time. With the same strength grade, the de- velopment ＇process of concrete with washed sea sand is obviously slower than that of sea sand concrete. The influence of sea water on steel corrosion is much worse than NaC1 solution. In addition, chloride ion in external environment is still main reason causing corrosion of steel embedded in sea sand concrete.

关 键 词：淡化海砂混凝土 钢筋锈蚀 腐蚀电位 腐蚀电流密度 

分 类 号：TU528.1[建筑科学—建筑技术科学] TU502