Evaluation of the efficiency of the secondary corrosion protection of steel reinforcement bars in concrete using a bimetallic batch sensor

• D.S. Shevtsov¹, N.L. Cao², I.D. Zartsyn¹, V.C. Nguyen², Q.Q. Nong², H.Q. Le², D.A. Nguyen², E.S. Komarova¹, D.A. Zhikhareva¹, O.A. Kozaderov¹ and A.T. Nguyen³

¹ Faculty of Chemistry, Voronezh State University, Universitetskaya pl. 1, 394018 Voronezh, Russian Federation
² Coastal Branch, the Joint Vietnam-Russia Tropical Science and Technology Research Center, Nguyen Thien Thuat St., 30, Nha Trang, Khanh Hoa, 57127, Vietnam
³ Faculty of Chemistry, Ho Chi Minh City University of Education, An Duong Vuong St., 280, Ho Chi Minh, 700000, Vietnam

Abstract: Bimetallic batch sensors allow evaluating the protective effect of compositions used for the secondary corrosion protection of reinforced concrete. Such compositions significantly reduce the permeability of concrete due to hydrophobization of the capillary pore structure. This conclusion was drawn from the fact that there is a good agreement with the measurement results obtained with the help of standardized electrochemical methods (specific electrical resistance of concrete, free corrosion potential, and the rate of corrosion calculated using the LPR data). A set of non-destructive electrochemical methods for corrosion testing was used to show the efficiency of the secondary protection of reinforced concrete against destruction of steel reinforcement bars by applying MasterProtect 8500 CI, a commercial product, to samples of mortar in the laboratory. According to qualitative criteria, the protective effect was at least 24 times higher as compared to untreated control samples. The corrosion rate was reduced by 100–200 times. It was suggested that there is a double protection mechanism due to the increased specific electrical resistance of concrete (hydrophobization of the surface of capillaries) and inhibition of electrochemical corrosion.

Keywords: bimetallic batch sensor, free corrosion potential, specific electrical resistance of concrete, LPR, hydrophobizator

Int. J. Corros. Scale Inhib., 2022, 11, no. 3, 1228-1237
doi: 10.17675/2305-6894-2022-11-3-19

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