Study on improvement of durability for reinforced concrete by surface-painting migrating corrosion inhibitor and engineering application

1st International Conference on New Material and Chemical Industry

材料科学;化学工业

Song, Ning^1 ; Wang, Zixiao^1 ; Liu, Zhiyong^1 ; Zhou, Jiyuan^2 ; Zheng, Duo^2

School of Civil Engineering, Yantai University, Yantai, Shandong

264005, China^1

Jilin Province Institute of Water Conservancy Science Research, Changchun, Jilin

130000, China^2

关键词: Atmospheric conditions;    Chloride migration coefficients;    Concrete specimens;    Corrosion current densities;    Durability improvement;    Engineering applications;    Migrating corrosion inhibitors;    Specification requirement;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/167/1/012072/pdf
DOI  :  10.1088/1757-899X/167/1/012072

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The corrosion currents of steel bar in concrete with three W/B and four chloride contents after surface-painting two migrating corrosion inhibitors (PCI-2015 and MCI-A) 14d to 150d in atmospheric condition were measured. The results showed that the corrosion current density (Icorr) of steel bar reduced to 0.1 μA.cm-2from the initial highest 3.833 μA.cm-2(W/B=0.65, NaCl-1%) after surface-painting PCI-2015 14 d, and the Icorrwas still lower than 0.1 μA.cm-2until 150d. The compressive strength and chloride migration coefficient of concrete specimens were tested. The possible reasons of the mechanisms of durability improvement for reinforced concrete by applying PCI-2015 inhibitor were PCI-2015 may be reacted with calcium hydroxide in cement concrete and lots of inhibitor particles may be adsorbed on the active sites first and then a stable protective layer may be formed. The Icorrof steel bars in a hydraulic aqueduct concrete structure after painting PCI-2015, MCI-A (the United States) and MCI-B (Europe) during 6 months was monitored by Gecor 8 tester. The results showed that the average values of Icorrof steel bars after painting the PCI-2015 150d fulfilled the specification requirements in "Design code for concrete structure strengthening (E.3) "(GB 50367-2013).