Bridge Deck Condition Studies in Missouri Utilizing Ground Penetrating Radar.

摘要

Ground penetrating radar (GPR) surveys were performed over the driving lanes of eleven Missouri bridges, and deterioration analysis results were compared with what ground truth was available. The bulk of the work was completed utilizing a new antenna designed for bridge deck evaluation, although comparison took place of the results on one bridge using this new antenna and older antennae. The good correlation obtained with the ground truth shows that GPR can give percent deterioration estimates that are accurate. The determination of the type of deterioration (delamination, debonding) using GPR alone is difficult and requires ground truth for calibration and pattern recognition. Results of this work suggest that GPR will yield good estimates of chain drag hollow areas, debonding, half-cell potential, and rebar corrosion. This study demonstrates GPR is effective by yielding deterioration estimates for key bridges in Missouri and delineates interpretation methodologies appropriate for the current state-of-the-practice in high-resolution GPR imaging.