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Detection of Debonds in Reinforced Concrete Using Ground Penetrating Radar

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Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

Debonding of reinforcements in concrete structures is one of the detrimental factors which causes reduction of structural capacity. Debonding occurs mainly due to faults incurred during casting, reinforcement corrosion, excess bond stresses due to overloading, etc. These defects compromise the integrity of the structure, abating the strength and durability. Therefore, detection of debonds and delaminations in structures at the earliest stage is essential. This study investigates for debonds around the reinforcement bars embedded in concrete using Ground Penetrating Radar (GPR). Radar imaging is a relatively modern non-destructive technique adopted for defect detection in concrete structures. The scattering of electromagnetic waves upon hitting the materials having different dielectric constant is the basis for assessing flaws and anomalies. In this study, a laboratory specimen has been prepared with predefined flaws having similar electrical permittivity to air to simulate debonding or delamination. GPR investigation has been carried out on the specimen and various data processing techniques have been explored to obtain enhanced B-scan image of embedded rebars and debonds. The experimental result shows that Migration algorithms has the potential of detecting defects in RC structures. A polarity change is observed to be an indicator for defect detection.

Keywords

  • Ground penetrating radar
  • Delamination
  • Dielectric constant
  • Modern nondestructive technique
  • Inversion of polarity

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  • DOI: 10.1007/978-981-16-9093-8_18
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Kuchipudi, S.T., Ghosh, D., Yumnam, M., Gupta, H. (2022). Detection of Debonds in Reinforced Concrete Using Ground Penetrating Radar. In: Mandayam, S., Sagar, S.P. (eds) Advances in Non Destructive Evaluation. NDE 2020. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-9093-8_18

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  • DOI: https://doi.org/10.1007/978-981-16-9093-8_18

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