不同保护层厚度新型海工混凝土的钢筋锈蚀行为研究  

Study on steel corrosion behavior of new marine concretewith different protective layer thickness

作　　者：李森林[1] 刘金文 达波 余红发[3] 陈达[2,4] 吴烨[1] LI Senlin;LIU Jinwen;DA Bo;YU Hongfa;CHEN Da;WU Ye(Nanjing Hydraulic Research Institute,Nanjing 210029,China;College of Port,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China;Department of Civil and Airport Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Key Laboratory of Coastal Disaster and Protection of Ministry of Education,Hohai University,Nanjing 210098,China;Institute of Ocean and Offshore Engineering,Nantong Hohai University,Nantong 226300,China)

机构地区：[1]南京水利科学研究院,江苏南京210029 [2]河海大学港口海岸与近海工程学院,江苏南京210098 [3]南京航空航天大学土木与机场工程系,江苏南京210016 [4]河海大学海岸灾害及防护教育部重点实验室,江苏南京210098 [5]南通河海大学海洋与近海工程研究院,江苏南通226300

出　　处：《江苏水利》2021年第8期4-9,14,共7页Jiangsu Water Resources

基　　金：中央级公益性科研院所基本科研业务费专项资金(Y420004);江苏省水利科技项目(2020017);中央高校基本科研业务费专项资金(B210202023);宁波市科技创新2025重大专项(2020Z040);南通市科技计划项目(JC2020120);海岸灾害及防护教育部重点实验室(河海大学)开放基金(202006)。

摘　　要：基于线性极化电阻法,研究不同保护层厚度、暴露时间和钢筋类别新型海工混凝土(new marine concrete,NMC)的线性极化曲线、自腐蚀电位(E_(corr))与极化电阻(R_(p))等电化学参数,探明不同保护层厚度和钢筋类别对NMC中钢筋锈蚀行为影响。研究发现:随着保护层厚度的增加,E_(corr)和R_(p)逐渐增大,表明NMC中钢筋的耐蚀性能不断增强。此外,当保护层厚度为5.5 cm时,NMC具有较优防锈效果,且满足结构要求。当暴露时间小于180 d时,NMC中不同类别钢筋的耐蚀性能为改性环氧沥青涂层钢筋>316不锈钢筋>普通钢筋,表明暴露较短时间,改性环氧沥青涂层钢筋的耐蚀性能优于316不锈钢筋。基于不同防锈措施的耐蚀性能和成本因素分析,建议海洋NMC结构优先选用改性环氧沥青涂层钢筋,保护层厚度至少为5.5 cm,有利于提升NMC结构的耐蚀性能,延长其服役寿命。Based on the linear polarization resistance method,the linear polarization curve,self-corrosion potential(E_(corr))and polarization resistance(R_(p))of new marine concrete(NMC)with different protective layer thickness,exposure time and steel bar types were studied,and the effects of different protective layer thickness and steel bar types on the steel corrosion behavior in NMC were investigated.It's found that with the increase of protective layer thickness,E_(corr) and R_(p) gradually increased,which indicated that the corrosion resistance of steel bars in NMC was continuously enhanced.In addition,when the protective layer thickness was 5.5cm,NMC had better anti-rust effect and met the structural requirements.When the exposure time was less than 180 d,the corrosion resistance of different steel types in NMC was the modified epoxy asphalt coated steel bar>316 stainless steel bar>ordinary steel bar,which indicated that the corrosion resistance of modified epoxy asphalt coated steel bar was better than that of 316 stainless steel bars after a short exposure time.Based on the analysis of corrosion resistance and cost factors of different anti-rust measures,it's suggested that modified epoxy asphalt coated steel bars should be preferred for marine NMC structures.The thickness of the protective layer should be at least 5.5cm,which was conducive to improving the corrosion resistance of NMC structures and prolonging their service life.

关 键 词：海洋工程 新型海工混凝土 保护层厚度 钢筋锈蚀 自腐蚀电位 极化电阻 

分 类 号：TV431[水利工程—水工结构工程]