Rehabilitation of Corroded Reinforced Concrete Elements by Rebar Replacement

Document Type : Regular Paper

Author

Department of Civil Engineering, Tafresh University, Tafresh, Iran

Abstract

In this study, the replacement of corroded reinforcement with new reinforcement as a rehabilitation method is considered to reduce the impact of corrosion on the performance of reinforced concrete structural elements. Also, the effect of using high-performance concrete with the method of reducing the water-to-cement ratio, as a method for maintenance of reinforced concrete structures, has been analyzed. So, the influence of the above rehabilitation methods for maintenance of reinforced concrete structures on the corrosion initiation time of reinforcement, crack initiation time and crack width of the concrete cover thickness, the service life of a reinforced concrete structure due to corrosion, and corrosion percentage of reinforcement have been investigated. For this purpose, all equations and connection between them for the corrosion phenomenon modeling (including corrosion initiation phase, corrosion propagation phase and cracking) is integrated, and the corrosion parameters are calculated and compared for the marine environmental conditions. The results indicated that, the end time of service life of a reinforced concrete structure due to corrosion (tf) increases 60.54% by applying the new reinforcement as a rehabilitation method. So, in concrete with a water-to-cement ratio of 0.35, the corrosion percentage of reinforcement in the new-reinforcement scenario has decreased by 15.60% compared to the no-repair scenario over 30 years.

Keywords

Main Subjects


[1] Naderpour, H., Rafiean, A.H., Fakharian, P. (2018). Compressive Strength Prediction of Environmentally Friendly Concrete Using Artificial Neural Networks, J. Build. Eng., 16, 213-219.
[3] Farahani, A., Taghaddos, H., Shekarchi, M. (2015). Prediction of long-term chloride diffusion in silica fume concrete in a marine environment. Cement and Concrete Composites, 59, 10-17.
[5] Sharifi, Y., Hosainpoor, M. (2020). A Predictive Model Based ANN for Compressive Strength Assessment of the Mortars Containing Metakaolin, J. Soft Comput. Civ. Eng., 4(2), 1-12.
[6] Sharbatdar, M.K., Abbasi, M., Fakharian, P. (2020). Improving the Properties of Self-Compacted Concrete with Using Combined Silica Fume and Metakaolin, PERIOD POLYTECH-CIV, 64(2), 535-544.
[7] Ogbonna, C., Mbadike, E., Alaneme, G. (2020). Characterisation and Use of Cassava Peel Ash in Concrete Production, Comput. Eng. Phys. Model., 3(2), 12-28.
[8] Tavakoli, D., Fakharian, P., Brito J. (2021). Mechanical Properties of Roller-Compacted Concrete Pavement Containing Recycled Brick Aggregates and Silica Fume, Road Mater. Pavement Des., 1-22.
[9] Tuutti, K. (1982). Corrosion of steel in concrete, CBI Research, Swedish Cement and Concrete Research Institute, Stockholm.
[10] Broomfield, J.P. (2006). Corrosion of steel in concrete: understanding, investigation and repair, Taylor and Francis, pp. 296.
[11] Farahani, A., Taghaddos, H. (2020). Prediction of Service Life in Concrete Structures based on Diffusion Model in a Marine Environment Using Mesh Free, FEM and FDM Approaches, J. Rehabil. Civ. Eng., 8(4), 01-14.
[12] Farahani, A. (2020). Life Cycle Cost GA Optimization of Repaired Reinforced Concrete Structures Located in a Marine Environment, J. Soft Comput. Civ. Eng., 3(4), 41-50.
[13] Tadayon, M.H., Shekarchi, M., Tadayon, M. (2016). Long-term study of chloride ingress in concretes containing pozzolans exposed to severe marine tidal zone, Construction and Building Materials, 123, 611–616.
[14] Bazant, Z.P. (1979). Physical Model for Steel Corrosion in Sea Structures Applications, J Struct Div, 105, 1155-1166.
[15] Du, Y., Clark, L.A., Chan, A.H.C. (2007). Impact of reinforcement corrosion on ductile behaviour of reinforced concrete beams, ACI Struct J, 104(3), 285-293.
[16] Molina, F.J., Alonso, C., Andrade, C. (1993). Cover cracking as a function of rebar corrosion: part 2- numerical model, Mater Struct, 26(9), 532-548.
[17] Liu, Y.P., Weyers, R.E. (1998). Modelling the time-to-corrosion cracking in chloride contaminated reinforced concrete structures, ACI Mater J, 95(6), 675-681.
[18] Bhargava, K., Ghosh, A.K., Mori, Y., Ramanujam, S. (2006). Analytical model for time to cover cracking in RC structures due to rebar corrosion, Nuclear Eng Design, 236(11), 1123-1139.
[19] Vu, K., Stewart, M.G., Mullard, J. (2005). Corrosion-induced cracking: experimental data and predictive models, ACI Struct J, 102(5), 719-726.
[20] Maaddawy, T., Soudki, K. (2007). A model for prediction of time from corrosion initiation to corrosion cracking, Cement Concrete Compos, 29, 168-175.
[21] Ohtsu, M., Yohsimura, S. (1997). Analysis of crack propagation and initiation due to corrosion of Reinforcement, Construct Build Mater, 11, 437-442.
[22] Williamson, S.J., Clark, L.A. (2000). Pressure required to cause cover cracking of concrete due to reinforcement corrosion, Magazine of Conc Res, 52(6), 455-467.
[23] Thoft-, P. (2003). Corrosion and cracking of reinforced concrete.” Lausanne: Life- Cycle Performance of Deteriorating Structures-Assessment, Design and Management, Eds. DM Frangopol, E Bruhwiller, MH Faber.
[24] Luping, T. (1998). Chloride Transport in Concrete, Measurement and Prediction, Ph.D. Thesis, Chalmers University of Technology, Department of Building Materials, publication P 96:6, Goteborg, Sweden.
[25] Khaghanpour, R., Dousti, A., Shekarchi, M. (2016). Prediction of cover thickness based on long-term chloride penetration in a marine environment, J. Perform. Constr. Facil., 1-10.
[26] Liu, Y.P., Weyers, R.E. (1998). Modelling the time-to-corrosion cracking in chloride contaminated reinforced concrete structures, ACI Mater J, 95(6), 675-681.
[27] Val, D.V. (2007). Factors affecting life-cycle cost analysis of RC structures in chloride contaminated environments, J. Infrastruct. Syst., 13(2), 135-143.
[28] Vu, K., Stewart, M.G. (2000). Structural reliability of concrete bridges including improved chloride-induced corrosion models, Struct Saf, 22, 313-333.
[29] Vidal, T., Castel, A., Francois, R. (2004). Analyzing crack width to predict corrosion in reinforced concrete, Cem. Concr. Res., 34(1), 165-174.
[30] Farahani, A., Shekarchi, M. (2020). Time-Dependent Structural Behavior of Repaired Corroded RC Columns Located in a Marine Site, J. Rehabil. Civ. Eng., 8(1), 40-49.
[31] Farahani, A., Taghaddos, H., Shekarchi, M. (2020). Influence of Repair on Corrosion Failure Modes of Square-RC Columns Located in Tidal Zone, J. Perform. Constr. Facil., 34(4), 1-14.