冻融损伤对引气混凝土中钢筋锈蚀的影响研究  

The Study on Steel Corrosion in Air Entraining Concrete under the Coupling Effects of Freeze-thaw Damage

作　　者：陈际洲[1] 赵铁军[1] 张鹏[1] 管廷 王越虹 CHEN Ji-zhou;ZHAO Tie-jun;ZHANG Peng;GUAN Ting;WANG Yue-hong(Qingdao University of Technology,School of civil engineering,266033;The second construction limited company of china construction eighth engineering division,Jinan 250014,Shandong;Qingdao High-tech Investment andDevelopment Croup Co.,Ltd.,266033)

机构地区：[1]青岛理工大学土木工程学院,266033 [2]中建八局第二建设有限公司,济南250014 [3]青岛高新区投资开发集团有限公司,266000

出　　处：《混凝土与水泥制品》2020年第1期16-20,共5页China Concrete and Cement Products

基　　金：国家自然科学基金重点国际合作项目(51420105015);国家自然科学基金项目(51778309);国家重点基础研究发展计划“973”项目(2015CB655100);山东省优秀青年基金(ZR2018JL018)

摘　　要：为研究冻融损伤环境下引气混凝土内部钢筋锈蚀规律和机理,同时考虑混凝土保护层厚度对内部钢筋锈蚀的影响,试验设计了不同保护层厚度的配筋普通混凝土和引气混凝土试件,分别利用半电池电位法和线性极化法测定了不同冻融循环次数下,试件内部钢筋的半电池电位值和腐蚀电流密度值。试验结果表明,随着冻融循环次数的增加,混凝土试件内部钢筋的半电池电位绝对值和腐蚀电流密度值均有显著增加,试件的抗锈蚀能力降低;但在相同冻融循环次数下,引气混凝土较普通混凝土具有更好的抗钢筋锈蚀性能;增加保护层厚度可以明显提高配筋混凝土的抗钢筋锈蚀能力。In order to study the steel corrosion in the reinforced concrete added with air entraining agent under freeze-thaw environment, and the influence of cover thickness on the steel corrosion, the ordinary reinforced concrete and air entraining concrete with different cover thickness were prepared, and the half cell potential and the linear polarization methods were used to evaluate the state of steel corrosion in different concrete specimens. The results show that the value of half cell potential and the linear polarization both increase with the increase of freeze-thaw cycles, which demonstrates the resistance to steel corrosion decrease. The resistance to steel corrosion of air entraining concrete is higher than that of the ordinary concrete, and the resistance to steel corrosion also raises with the increase of cover thickness.

关 键 词：冻融损伤 引气混凝土 钢筋锈蚀 电化学方法 保护层厚度 

分 类 号：TU528.45[建筑科学—建筑技术科学]