Evaluation of Stress-Wave Methods for Implementation into a Rolling System toDetect Pavement Irregularities

摘要

Experimental testing was performed to study the feasibility of implementing twostress-wave techniques, the impact-echo and impulse-response methods, into a rolling system for 'on-the-fly' detection of subsurface flaws in rigid concrete pavements. These studies have concentrated on flaws such as delaminations within the rigid surface layer, and on voids and debondings directly under the rigid surface layer. Experimental tests were performed under controlled conditions at three test sites, including two full-scale test pavement facilities. Identical locations were tested using the impact-echo and impulse-response techniques so that the applicability of each technique for detection of various flaw conditions could be directly compared. Successful application of these techniques to detecting voids and debondings is presented. Lastly, experimental studies were performed to evaluate the feasibility of receiving the frequencies of interest for the impact-echo and impulse-response methods with a wheel-mounted receiver. These results, along with the experimental field results and numerical modeling results, are used to illustrate the advantages and limitations of each nondestructive testing technique for implementation into a rolling system for project-level studies.