Influence of Inhibitors on Reinforced Bar Corrosion of Coral Aggregate Seawater Concrete

doi:10.11902/1005.4537.2018.040

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (2): 152-159 DOI: 10.11902/1005.4537.2018.040

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Influence of Inhibitors on Reinforced Bar Corrosion of Coral Aggregate Seawater Concrete

Bo DA,Hongfa YU(

),Haiyan MA,Zhangyu WU

Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

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Abstract

The effect of inhibitors on corrosion behavior of reinforced bar in coral aggregate seawater concrete (CASC) in artificial sea water was studied by means of linear polarization resistance method (LPR) and electrochemical impedance spectroscopy (EIS). Two inhibitors, calcium nitrite rust inhibitor (CN) and amino-alcohol rust inhibitor (AA) are concerned, while two ways are adopted for mixing inhibitor into the concrete, namely, the inhibitor was directly dissolved into the seawater (ordinary way) and absorbed onto the coral aggregate (pre-absorbed way). The results show that for CASC concretes without and with inhibitor added via ordinary way, E_corr, R_p and R_ct decreased with the extension of the exposure time, but for those with the pre-absorbed inhibitor, E_corr, R_p and R_ct has a grown trend when exposure for 90 d, demonstrating that the pre-absorbed inhibitor onto the aggregate would gradually and continuously be released into the concrete to increase its barrier effect to the migration of harmful Cl^-, therewith to alleviate the corrosion of the reinforced bar. Besides, the addition of CN or AA could enhance the corrosion resistance of the reinforcement bar, however the degradation rate of anticorrosion effectiveness of CN was higher than that of AA. Therefore, for marine engineering structures made of CASC on islands and reefs, it was suggested to adopt the pre-absorbed AA, which could prolong the time for the corrosion initiation of reinforced bar, reduce the corrosion rate and prolong the service life of the CASC structures.

Key words: coral aggregate seawater concrete reinforced bar corrosion linear polarization resistance method electrochemical impedance spectroscopy method inhibitor adding mode

Received: 01 April 2018

ZTFLH:

TU528

Fund: National Natural Science Foundation of China(51508272);National Natural Science Foundation of China(51678304);National Natural Science Foundation of China(51878350);National Natural Science Foundation of China(11832013);Natural Science Foundation of Jiangsu Province(BK20180433);China Postdoctoral Science Foundation(2018M630558)

Corresponding Authors: Hongfa YU E-mail: yuhongfa@nuaa.edu.cn

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Bo DA,Hongfa YU,Haiyan MA,Zhangyu WU. Influence of Inhibitors on Reinforced Bar Corrosion of Coral Aggregate Seawater Concrete. Journal of Chinese Society for Corrosion and protection, 2019, 39(2): 152-159.

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https://www.jcscp.org/EN/10.11902/1005.4537.2018.040 OR https://www.jcscp.org/EN/Y2019/V39/I2/152

Table 1 Physical properties of coral aggregate

Fig.1 Schematic diagrams of CASC: (a) vertical sectional profile, (b) cross sectional profile (A-A) (unit: mm)

Fig.2 Schematic diagram of electrochemistry test of CASC

Fig.3 Influence of inhibitor type and adding mode on E_corr of CASC

Fig.4 Influence of inhibitor type and adding mode on the linear polarization curve of CASC after immersion in artificial seawater for 0 d (a), 28 d (b), 90 d (c) and 180 d (d)

Fig.5 Influence of inhibitor type and adding mode on R_p of CASC

Fig.6 Corrosion states of common steel I (a) and II (b) rebar in reinforc-ed-CASC beam

Fig.7 Influence of inhibitor type and adding mode on the electrochemical impedance spectroscopy of CASC after immersion in artificial seawater for 0 d (a), 28 d (b), 90 d (c) and 180 d (d)

Table 3 Values of R_ct of common steel rebar in CASC with different inhibitors

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