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Comparative Study of Multiple NDT Technologies from the Surveys on a Reinforced Concrete Bridge Deck and Prefabricated Slab

Multiple nondestructive testing (NDT) technologies were used with the objective to evaluate their performance in detection and characterization of bridge deck deterioration, and to assess potential benefits of their complementary use. To meet the objectives of the study, a deck of a bridge in Virginia and a prefabricated slab with artificial defects were surveyed. Four NDT technologies, namely: impact echo (IE), ground penetrating radar (GPR), half-cell potential (HCP), and electrical resistivity (ER) were used in the surveys. The paper provides an overview of the technologies used and the results of the surveys. Results from the different technologies have been compared with respect to detection of a particular deterioration type. Results include delamination maps from IE, attenuation maps from GPR, HCP corrosion activity maps, and resistivity maps from ER. The results were validated using cores and through the comparison to the known locations of defects in the case of the prefabricated slab. In addition, correlations between the results have been examined. The most significant correlations relate to detection of delamination and corrosion. The surveys were conducted with the Strategic Highway Research Program 2 (SHRP 2) funded project R06-A.

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