摘要
为研究增稠剂对自密实混凝土中钢筋锈蚀性能的影响,采用体视显微镜、线性极化、电化学阻抗谱和Tafel极化测试方法,研究了3种常用增稠剂聚丙烯酰胺(PAM)、羟丙基甲基纤维素(HPMC)和羟乙基纤维素(HEC)在模拟混凝土孔溶液中对钢筋锈蚀性能的影响。结果表明:PAM、HPMC和HEC可以有效抑制模拟混凝土孔溶液中钢筋的腐蚀,随着增稠剂掺量的增加,钢筋的耐蚀性能增强。3种增稠剂对钢筋电极的阻锈能力按HEC<HPMC<PAM的顺序递增。此外,PAM、HPMC和HEC对钢筋腐蚀阴极过程的抑制作用强于阳极过程。其中,PAM和HPMC为阴极型阻锈剂,HEC为以抑制阴极为主的混合型阻锈剂。
In order to research the effect of viscosity modifying admixture(VMA)on the rebar rust resistance in self⁃compacting concrete,stereoscopic microscope,linear polarization,electrochemical impedance spectroscopy and Tafel polarization test method were utilized to study the effect of three commonly used viscosity modifying admixtures,polyacrylamide(PAM),hydroxypropyl methyl cellulose(HPMC)and hydroxyethyl cellulose(HEC)on the rebar rust resistance performance in simulated concrete pore solution.Results showed that PAM,HPMC and HEC could effectively inhibit the corrosion of rebar in simulated concrete pore solution.With the content of VMAs increasing,the corrosion resistance of rebar was enhanced.The rust resistance ability of the three VMAs on rebar increased in the following order:HEC<HPMC<PAM.Furthermore,the inhibition effect of PAM,HPMC and HEC on the cathodic corrosion process of rebar was stronger than that of the anodic process.Among them,PAM and HPMC were cathode type rust inhibitors,while HEC was a mixed type rust inhibitor that mainly suppressed the cathode.
作者
周阜军
职芳芳
蒋林华
陆凤华
ZHOU Fu-jun;ZHI Fang-fang;JIANG Lin-hua;LU Feng-hua(Jiangsu Yancheng Hydraulic Engineering Construction Co.,Ltd.,Yancheng 224006,China;College of Mechanics and Materials,Hohai University,Nanjing 210098,China)
出处
《材料保护》
CAS
CSCD
2023年第6期82-88,共7页
Materials Protection
基金
江苏省水利科技项目(2021018)
国家自然科学基金(52078183)资助。
关键词
增稠剂
钢筋腐蚀
模拟混凝土孔溶液
电化学评价
viscosity modifying admixture
rebar corrosion
simulated concrete pore solution
electrochemical evaluation
