CONTINUOUS NONDESTRUCTIVE EVALUATION OF CONCRETE PAVEMENTS SOME ASPECTS OF THE METHOD USED IN FRANCE FOR GOVERNMENT OPERATED ROADS

Concrete slabs rarely exhibit inherent defects, their degradation being related to a deterioration in the substructures. The main purpose of continuous evaluation is to assess pavement bearing conditions and, where possible, pavement external behavior indicators are used for this purpose. For the most significant indicators (slab degradation, detachment, deflection) rapid or semi-rapid measuring instruments have been developed, some operating under traffic at speeds over 50 km/h. The GERPHO (photographic road survey unit) allows continuous photography of pavements and of the interesting part of the shoulder at a speed between 50 and 60 km/h. It reveals the structural defects of pavements: cracks, pumping wells. The APL (longitudinal profile analyzer) used with a special analysis version provides data on slab faulting based on measurements at 7.5 km/h. The DMBD (slab deflection measurement system) and the COLLOGRAPHE work at much lower rates (about a kilometer/hour). If utilization precautions are taken, particularly as concerns temperature, these devices complement very effectively the high-output investigations. They provide data on slab bearing conditions before deterioration is shown by visible defects. In addition to their use in the monitoring of pavement condition and maintenance scheduling, this equipment is used during construction with certain slab strengthening techniques for example (grouting, tying, etc.). (Author)

• Supplemental Notes:
  • Proceedings of the 2nd International Conference on Concrete Pavement Design, held at Purdue University, April 14-16, 1981.
• Corporate Authors:

  Purdue University

  School of Aeronautics and Astronautics
  West Lafayette, IN  United States  47907
• Authors:
  • CHRISTORY, J P
• Conference:
  • Proceedings of the 2nd International Conference on Concrete Pavement Design, held at Purdue University, April 14-16, 1981.
• Publication Date: 1981-4

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 221-230

Subject/Index Terms

• TRT Terms: Bearing capacity; Concrete pavements; Condition surveys; Conferences; Deflection; Measuring instruments; Nondestructive tests; Pavement cracking; Pavement design; Pavement maintenance; Pavements; Paving; Photography; Pumping (Pavements); Temperature
• Uncontrolled Terms: Rapid methods
• Old TRIS Terms: Bearing values; Continuous methods; Pavement deflection
• Subject Areas: Design; Highways; Maintenance and Preservation; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 00334255
• Record Type: Publication
• Report/Paper Numbers: Proceeding
• Files: TRIS, USDOT
• Created Date: Sep 16 1981 12:00AM