AIRFIELD PAVEMENT EVALUATION AND STRENGTHENING BASED ON NDT AND AIDED BY AN EXPERT SYSTEM. SIXTH INTERNATIONAL CONFERENCE, STRUCTURAL DESIGN OF ASPHALT PAVEMENTS, VOLUME I, PROCEEDINGS, UNIVERSITY OF MICHIGAN, JULY 13-17, 1987, ANN ARBOR, MICHIGAN

The paper presents the methodology presently used by the authors for the evaluation of the bearing strength of flexible airfield pavements as well as a procedure for determining the required overlay thickness. The methodology is based on nondestructive testing deflection measurements, the use of linear layered elastic theory to interpret the measurements in terms of layer elastic moduli and on CBR design curves. The method is related to the current ICAO requirements for the reporting of pavement strengths in terms of ACN-PCN. A Knowledge Based Expert System is presented that should be useful in estimating reasonable in situ CBR values based on subgrade soil classification and environmental conditions. The system also includes guidance in determining the strength of an existing flexible pavement in terms of its PCN based on both nondestructive testing and experience with the aircraft using the facility. The expert system is used to check the NDT results. An example is given illustrating the methodology. Sufficient detail has been included so that the reader can prepare his own version of the Expert System usng a "shell" and microcomputer of his choice.

• Corporate Authors:

  University of Michigan, Ann Arbor

  Department of Civil Engineering
  Ann Arbor, MI  United States  48109
• Authors:
  • WISEMAN, G
  • Uzan, J
  • GREENSTEIN, J
• Publication Date: 1987

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 1002-12
• Serial:
  • Publication of: Michigan University, Ann Arbor
  • Publisher: University of Michigan, Ann Arbor

Subject/Index Terms

• TRT Terms: Airport runways; Asphalt pavements; Bearing capacity; California bearing ratio; Conferences; Deflection; Evaluation; Expert systems; Flexible pavements; Microcomputers; Modulus of elasticity; Nondestructive tests; Overlays (Pavements); Pavement performance; Pavements; Strength of materials; Structural strengthening; Thickness
• Old TRIS Terms: Pavement deflection
• Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 00485660
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 31 1989 12:00AM