Effect of Migrating Corrosion Inhibitor on Corrosion Rate of Reinforcing Steel in Concrete with Various Admixed Chloride

Abstract:

Effect of surface applied inhibitor on the durability of chloride contaminated reinforced concrete has been investigated in this paper. The C30 concrete samples contaminated with 0.5%,1.0%,1.5% NaCl by mass of the cementitious materials in the mixing process were experienced adequate curing and subjected to 1 months exposure tests after painting with 400 g/m2 MCIs. The corrosion behavior of the steel rebar in concrete samples was monitored by using electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR) and corrosion currents. The results indicate that, after painting the MCIs for 28d on the surface of concrete samples with 0.5% and 1% NaCl, the average corrosion rate of reinforcements in concrete samples （0.34μA/cm2 ）is lower than that of the control one (No.0, no painted inhibitor), and about 1/4 of the initial corrosion current of the samples with 0.5% and 1% NaCl before painting MCI. But the corrosion current of rebar in No.3 sample with 1.5% NaCl is still higher than that of the control one (No.0). Therefore, painting MCIs on the surface of samples is very effective to inhibit the corrosion of steel bar in concrete at low or middle chloride conditions, but it is not enough to repair severely corroded steel bar in high chloride contaminated concrete.

• Periodical: Applied Mechanics and Materials (Volumes 204-208)
• Pages: 3146-3150
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.204-208.3146
• Online since: October 2012
• Authors: Zhi Yong Liu, Xin Gang Zhou, Xiu Lin Li
• Keywords: Chloride-Contaminated Concrete, Corrosion Rate, Migrating Corrosion Inhibitor

References

[1] Batis, G., Pantazopoulou, P. and Routoulas, A., Corrosion protection investigation of reinforcement by inorganic coating in the presence of alkanolamine-based inhibitor[J]. Cem. Concr. Comp., 2003, 25(3):371-377.

DOI: 10.1016/s0958-9465(02)00061-6

[2] H.E. Jamil, M.F. Montemor, R. Boulif c, etal., An electrochemical and analytical approach to the inhibition mechanism of an amino-alcohol-based corrosion inhibitor for reinforced concrete, Electrochimica Acta 48 (2003) 3509-3518

DOI: 10.1016/s0013-4686(03)00472-9

[3] Jamil H.E. Shriri, A. and Boulif, R.,Corrosion behaviour of reinforcing steel exposed to an amino alcohol based corrosion inhibitor[J]. Cem. Concr. Comp., 2005, 27(6):671-678.

DOI: 10.1016/j.cemconcomp.2004.09.019

[4] Mechmeche, L. B., Dhouibi, L., Ouezdou, M. B., Triki, E. and Zucchi, F., Investigation of the early effectiveness of an amino-alcohol based corrosion inhibitor using simulated pore solutions and mortar specimens[J]. Cem. Concr. Comp., 2008, 30(3):167-173.

DOI: 10.1016/j.cemconcomp.2007.05.007

[5] Morris, W. and Va´zquez M., A migrating corrosion inhibitor evaluated in concrete containing various contents of admixed chlorides[J]. Cem. Concr. Res., 2002, 32(2): 259-267.

DOI: 10.1016/s0008-8846(01)00669-x

[6] LIU Zhiyong, MIAO Changwen, ZHOU Weilin, et.al, Maintenance and improvement of durability of reinforced concrete using migrating corrosion Inhibitors [J], J Chin Ceram Soc(in Chinese), 2008, 36(10): 1494-1500.

[7] Soylev, T.A.and Richardson, M.G., Corrosion inhibitors for steel in concrete: State-of-the-art report[J]. Construction and Building Materials, 2008, 22(4) :609-622.

DOI: 10.1016/j.conbuildmat.2006.10.013

[8] GB 7173-87, Determination of Kjeldahl Nitrogen in soil[S] (in Chinese), Beijing: China Standard Press, 1987.

[9] Broomfield, J.P., Rodríguez, J., Ortega, L.M. et.al. ,Corrosion Rate Measurements in Reinforced Concrete Structures by a Linear Polarisation Device[A]. Philip D. Cady .Symposium on Corrosion of Steel in Concrete, R.E. Weyers (ed.)[C]. ACI SP 151.(1994)

DOI: 10.14359/4348