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Condition Assessment of Reinforced Concrete and FPR Composite Structural Components using NDT Techniques

Nondestructive Testing (NDT) techniques play a crucial role in the condition assessment of existing structures and to ensure the quality of rehabilitation. Fiber reinforced polymer (FRP) composites are increasingly being used to rehabilitate aging reinforced concrete structural components. Infrared thermography is a useful technique for assessing the condition of concrete structural members prior to rehabilitation and after rehabilitation using FRP composites. This paper demonstrates the usefulness of low cost infrared cameras and digital tap testing device for field condition assessment of the bond between external FRP composite fabric and the underlying reinforced concrete member. The bond integrity is crucial for achieving enhanced strength of the rehabilitated structural component. Therefore, use of NDT techniques for periodic monitoring over the life of the structure is important to take timely remedial action in case a problem is detected, which can help to ensure continued structural integrity and prolong the service life of the rehabilitated structure. The paper also discusses the use of infrared thermography and ground penetrating radar for condition assessment of reinforced concrete structures in the field environment.

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