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Practical Assessment of Non-Destructive Testing (NDT) Techniques for On-Site Application of GDOT Projects
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2025-03-01
[PDF-7.22 MB]
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Edition:Final Report
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Abstract:Non-destructive testing (NDT) is often conducted to evaluate the performance and condition of assets and infrastructures. Practical considerations must be considered when conducting NDT in the field. This study evaluates the effectiveness and practicality of various NDT methods for inspecting reinforced concrete structures, with a focus on the application of ground-penetrating radar (GPR). It encompasses two investigations: a laboratory study and a field study. In the laboratory, GPR was used on concrete slabs with simulated defects to validate the accuracy of GPR data against the slab designs. The field study, conducted on an aging bridge deck, employed multiple NDT techniques, including GPR, impact echo, ultrasonic pulse echo, a cover meter, and a rebound hammer. Most of the data from the NDT methods correlated well with the core samples, achieving acceptable accuracy levels. The study highlights the limitations of NDT methods in practical field conditions versus controlled laboratory settings, especially when dealing with unknown embedded objects and defects. However, it emphasizes the potential of NDT methods for structural evaluations in civil engineering, noting the importance of technical knowledge in interpreting results.
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