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Experimental analysis and behavior of corrosion-damaged fly ash blended reinforced concrete beam under flexural loading

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Abstract

The corrosion of reinforcing bars is the primary cause of deterioration in reinforced concrete (RC) structures. A study was carried out experimentally to investigate the effect of corrosion on the flexural strength of the RC beams with FA as a corrosion inhibitor. An accelerated corrosion aging technique was employed to induce corrosion in the embedded reinforcing bars within the concrete. By using the half-cell potential test, the corrosion-resisting characteristics of longitudinal and transverse reinforcement blended with FA contents of 10%, 20%, and 30% have been evaluated and Results show that FA blended with 30% exhibits greater corrosion resistance. The actual amount of corrosion in both transverse and longitudinal reinforcement within the beam was evaluated by extracting the reinforcement bars from the concrete. The flexural strength, load–deflection curve, and moment–curvature relationships of both uncorroded and corroded RC beams were analyzed. The flexural strength of the corroded RC beams was increased up to 20% cement replacement by FA. It was found that maximum flexural strength significantly decreased when the degree of corrosion increased from 10 to 15%. The increase in the degree of corrosion is significant in causing a reduction in the ductility ratio of beams to absorb energy. Furthermore, the increase in the volume of rust caused radial pressure on the concrete surface, resulting in various cracking mechanisms. Based on the findings, it is evident that corrosion exerts a substantial influence on the behavior of the reinforcing bar, as well as on the load-bearing capacity, stiffness, and deflection of the beam.

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  1. School of Civil Engineering, Dr. Vishwanath Karad MIT World Peace University, Pune, Maharashtra, 411038, India

    Sandeep Sathe & Sudhir Patil

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SS: conceptualization; methodology, investigation, writing- original draft; SP: supervision, review.

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Sathe, S., Patil, S. Experimental analysis and behavior of corrosion-damaged fly ash blended reinforced concrete beam under flexural loading. J Build Rehabil 8, 97 (2023). https://doi.org/10.1007/s41024-023-00344-9

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