EVALUATION OF STRESS-WAVE METHODS FOR IMPLEMENTATION INTO A ROLLING SYSTEM TO DETECT PAVEMENT IRREGULARITIES. FINAL REPORT
Experimental testing was performed to study the feasibility of implementing two stress-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. Results from previous finite element studies are presented to demonstrate the effects of parameters associated with the flaw (such as size and depth) and the pavement system (such as surface layer thickness and surface-base impedance contrast). 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.
- Research study title: Automated Equipment for Characterizing the Properties and Thicknesses of Pavements.
University of Texas, AustinCenter for Transportation Research, 3208 Red River Street
Austin, TX United States 78705
Austin, TX United States 78763-5051
Washington, DC United States 20590
- Rosenblad, B L
- Stokoe II, K H
- Roesset, J M
- Publication Date: 1995-4
- Features: Figures; Photos; References;
- Pagination: 190 p.
- TRT Terms: Alternatives analysis; Cracking; Debonding; Delamination; Nondestructive tests; Rigid pavements; Stresses; Testing equipment; Void ratios; Waves; Wheels
- Candidate Terms: Impact echo tests; Impulse response
- Uncontrolled Terms: Stress waves; Voids
- Old TRIS Terms: Wheel-mounted receivers
- Subject Areas: Highways; Pavements; Vehicles and Equipment; I23: Properties of Road Surfaces;
- Accession Number: 00720271
- Record Type: Publication
- Report/Paper Numbers: FHWA/TX-95-1243-5F, Res Rept 1243-5F, CTR 0-1243-5F
- Contract Numbers: Study 0-1243
- Files: TRIS, USDOT, STATEDOT
- Created Date: Apr 24 1996 12:00AM