矿物掺合料及腐蚀溶液对混凝土中钢筋的锈蚀行为的影响  

Influences of Mineral Admixture and Corrosion Solution on Corrosion Behavior of Steel Bar in Concrete

作　　者：刘影[1] 金祖权[1] 张宇[1] 杨莉[2] 

机构地区：[1]青岛理工大学土木工程学院,青岛266033 [2]河海大学文天学院土木工程系,马鞍山243000

出　　处：《腐蚀与防护》2016年第4期283-288,共6页Corrosion & Protection

基　　金：国家自然科学基金项目(51178230);铁道部科研计划项目(2014G004-F);青岛市科技项目(13-1-4-176-jch;13-1-4-115-jch)

摘　　要：采用电化学阻抗谱研究了掺加不同量粉煤灰、矿粉的混凝土中钢筋的锈蚀行为,并探讨了复合盐溶液、海水和单一氯盐溶液对混凝土中钢筋阻抗谱及锈蚀行为的影响。结果表明：掺入30%（与水泥的质量比,下同）粉煤灰以及30%矿粉的C30混凝土,其抗压强度分别下降了45%和35%,且随着矿物掺合料掺量的增加,混凝土抗压强度损失越大。对养护7d的C30混凝土而言,腐蚀溶液导致钢筋锈蚀严重性排序为：复合盐溶液〉海水〉氯盐溶液。混凝土中掺入15%～20%矿粉或15%粉煤时,混凝土抵钢筋锈蚀能力最好,但随着矿物掺合料掺量进一步增加,其护筋能力下降。The corrosion behavior of reinforced bar in concrete with mineral admixture including fly ash and ground granulated blastfurnace slag（GGBS）was studied by electrochemical impedance spectroscopy（EIS）.And the influence of corrosion solutions including seawater,sodium chloride and composite solutions on EIS of steel bar was also researched.The experimental results indicated that the compressive strength of C30 concrete mixed with 30%fly ash and 30%（mass ratio to concrete）GGBS decreased by 45% and 35%,respectively.And the loss of compressive strength of concrete increased with increasing replacement rate of mineral admixture.And the corrosion rate of steel bar in solutions decreased in the following order,composite solution〉 sea wate〉 chloride solution.The corrosion resistance capacity of concrete was the best when 15%-20% GGBS,or 15%fly ash was used to replace the cement.And then the resistance capacity of concrete decreased with increasing replacement rate of mineral admixture.

关 键 词：混凝土 干湿循环 钢筋腐蚀 电化学阻抗谱(EIS) 

分 类 号：TG174[金属学及工艺—金属表面处理]