High-speed, Dual-polarization Method of Ground Penetrating Radar Bridge Deck Evaluation
نویسنده
چکیده
Traditional GPR Surveys. High-speed GPR surveys have been performed for many years to map the condition of aging bridge deck structures. Most often, one or more 1.0 GHz horn antennas are driven along unique survey paths spaced anywhere from 3 to 4ft apart—and 2 to 3 GPR scans are collected along every linear foot of the deck surface that is being sampled. Surface dielectric properties, signal attenuation through the deck thickness, and reinforcement reflection amplitude, as well as a number of other variables, are correlated to deck condition. Although this traditional GPR method is moderately successful in terms of its ability to estimate the percentage of deck area that is deteriorated, it has produced very mixed results in terms of its ability to accurately locate deterioration quantities on a deck and define their boundaries. Particularly, when deterioration quantities (determined by other methods such as sounding) fall under 10% of total deck area, or above 45% of deck area, these traditional, high-speed GPR surveys often under-predict or over-predict deterioration quantities by a factor of two or more.
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............................................................................... i Grant Information.................................................................... ii Dedication............................................................................. iii Acknowledgement.................................................................... iv List of Figures...................................
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