Acoustic Emission Monitoring of RC Beams Corroded to Different Levels Under Flexural Loading
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RESEARCH ARTICLE-CIVIL ENGINEERING
Acoustic Emission Monitoring of RC Beams Corroded to Different Levels Under Flexural Loading Sunil Garhwal1
· Shruti Sharma1 · Sandeep Kumar Sharma2
Received: 9 June 2020 / Accepted: 29 August 2020 © King Fahd University of Petroleum & Minerals 2020
Abstract The focus of the research is to evaluate the behavior and performance of large-sized reinforced concrete (RC) beams corroded to different levels using local acoustic emission (AE) technique under flexural loading. With increase in the level of corrosion, the ultimate load-carrying capacity and midspan deflections are drastically reduced, which is indicative of increasing brittleness and decreasing ductility in the corroded beams. AE monitoring of corroded RC beams under flexural loading clearly demonstrated various failure progression stages right from initiation of cracking to their ultimate failure. As the level of corrosion increases, a significant drop in cumulative AE hits is observed. AE activity depicted as AE phases is delayed and diminished due to the attenuation of the captured AE signals caused by cracks developed due to corrosion. AE event plots give a pictorial representation of actual development and progression of micro- and macrocracking inside concrete as the corroded beams are subjected to flexural loading. The assessment of damage in RC beams subjected to simultaneous corrosion and loading would facilitate in situ nondestructive evaluation of actual RC structures in the future. Keywords Corrosion · Flexural · Deflection · AE hits · Event plots · Cracking
1 Introduction The most commonly used construction material throughout the world is concrete as it can be molded into any shape and size along with promising durability and high compressive strength. Concrete due to its high-alkaline pore solution (pH > 13.5) provides a protective covering to the reinforcement from corrosion as it forms a dense impermeable film on the steel surface. This layer becomes very vulnerable due to its exposure to aggressive environments, thus leading to corrosion [1]. Corroded steel has a tendency to exert tensile stresses on concrete as their volume tends to increase 3–6 times the volume of parent steel [2]. Corrosion can be
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Sunil Garhwal [email protected]; [email protected] Shruti Sharma [email protected] Sandeep Kumar Sharma [email protected]
1
Department of Civil Engineering, Thapar Institute of Engineering and Technology, Patiala, Punjab 147004, India
2
Department of Mechanical Engineering, Thapar Institute of Engineering and Technology, Patiala, Punjab 147004, India
very catastrophic for RC structures as it leads to dissolution of steel leading to area reduction and pitting of reinforcing bars and thus affecting the ultimate load-carrying capacity of the structural elements [3–6]. The process and mechanism of corrosion in reinforced concrete structures exposed to severe environmental conditions has been typically divided into four different phases. Puncture of passive layer leading to
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