Diya Verma
Independent Researcher
India
Abstract
Corrosion of steel reinforcement bars is a critical factor affecting the durability and safety of reinforced concrete structures. Thermo-Mechanically Treated (TMT) bars, known for their superior strength and ductility, are widely used in construction. This study investigates the corrosion resistance of TMT bars under varying environmental conditions, including chloride exposure and acidic environments, to evaluate their performance relative to conventional mild steel bars. Experimental methods, such as salt spray testing and electrochemical impedance spectroscopy, were employed to assess corrosion rates and mechanisms. The results indicate that TMT bars exhibit enhanced corrosion resistance due to their unique microstructural characteristics, including a tough outer martensitic rim and a ductile ferrite-pearlite core. The study further explores the influence of chemical composition, surface morphology, and protective oxide layers on corrosion behavior. This investigation provides insights into material selection and durability considerations for reinforced concrete structures exposed to aggressive environments.
Keywords
TMT bars, corrosion resistance, reinforced concrete, chloride exposure, electrochemical impedance spectroscopy, microstructure
REFERENCES
- Albrecht, P., & Hall, T. (2010). Atmospheric corrosion resistance of reinforcement bars in concrete structures. Construction and Building Materials, 24(9), 1616–1622. https://doi.org/10.1016/j.conbuildmat.2010.02.025
- Ahmad, S. (2011). Reinforcement corrosion in concrete structures, its monitoring and service life prediction––A review. Cement and Concrete Composites, 25(4-5), 459–471. https://doi.org/10.1016/S0958-9465(02)00086-0
- Verma, S. K., Sharma, U., & Jain, A. K. (2012). Performance assessment of corrosion resistance of TMT bars under different aggressive environments. International Journal of Engineering Research and Applications, 2(4), 232–237.
- Saravanan, J., & Sekar, S. K. (2013). Comparative study on corrosion behavior of TMT bars with and without epoxy coating in concrete. Asian Journal of Civil Engineering, 14(1), 145–154.
- Li, L., & Sagues, A. A. (2014). Chloride corrosion threshold of reinforcing steel in alkaline solutions – A re-evaluation. Cement and Concrete Research, 78, 195–201. https://doi.org/10.1016/j.cemconres.2015.07.007
- Prakash, J., & Kumar, R. (2014). Effect of corrosion inhibitors on corrosion behavior of TMT rebars. International Journal of Engineering Science and Technology, 6(6), 125–132.
- Singh, M. P., & Kaushik, S. K. (2015). Influence of cover thickness and concrete strength on corrosion resistance of TMT bars. Journal of Structural Engineering, 42(4), 365–372.
- Ghosh, P., & Pal, S. C. (2016). Electrochemical evaluation of corrosion behavior of TMT bars in concrete. Procedia Engineering, 125, 758–765. https://doi.org/10.1016/j.proeng.2015.11.117
- Thangavel, K., & Arulraj, G. (2016). Field studies on corrosion performance of rebars in coastal environments. Indian Concrete Journal, 90(1), 45–51.
- Patel, H., & Desai, A. (2017). Comparative corrosion resistance of CRS and TMT bars in different environments. Materials Today: Proceedings, 4(8), 8083–8090. https://doi.org/10.1016/j.matpr.2017.07.132
- Khan, I., & Srivastava, V. K. (2018). Effect of microstructure on corrosion resistance of TMT steel bars in concrete. Materials Performance and Characterization, 7(4), 628–638. https://doi.org/10.1520/MPC20170122
- Dixit, A., & Bhattacharjee, B. (2019). Corrosion initiation and propagation time of rebars in concrete: Effect of bar type and environmental conditions. Construction and Building Materials, 202, 448–459. https://doi.org/10.1016/j.conbuildmat.2019.01.027
