DETERMINING ASPHALTIC CONCRETE PAVEMENT STRUCTURAL PROPERTIES BY NONDESTRUCTIVE TESTING

The high-volume data collection capabilities of modern nondestructive testing equipment require an analysis method which is capable of rapid backcalculation of pavement layer moduli in a production mode of data reduction. A layered elastic analysis method named MODULUS was developed for microcomputer which is very fast in operation and provides consistently reliable results. Random errors in the measurements and systematic errors in the backcalculation process may be reduced, the former by repeating the measurements and the latter by use of a microcomputer expert system named PASELS, to provide consistently acceptable layer moduli values. Users guides to both microcomputer programs are provided. Extensive field measurements were made in different climatic zones throughout the year and were compared with laboratory measurements of the layer moduli to verify the analysis methods developed and to gauge the realism of the adjustments made from local conditions of load level, temperature, and moisture to a standard condition. Correlations between nondestructive testing devices were found to be consistent, accurate, and repeatable using layer moduli corrected to standard conditions.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/nchrp/nchrp_rpt_327.pdf
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309046246
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Lytton, R L
  • Germann, F P
  • Chou, Y J
  • Stoffels, S M
• Publication Date: 1990-6

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 111 p.
• Serial:
  • NCHRP Report
  • Issue Number: 327
  • Publisher: Transportation Research Board
  • ISSN: 0077-5614

Subject/Index Terms

• TRT Terms: Accuracy; Asphalt concrete; Backcalculation; Computer programs; Elastic analysis; Errors; Expert systems; Layer coefficient (Pavements); Microcomputers; Modulus; Nondestructive tests; Pavements; Testing equipment
• Uncontrolled Terms: Layer moduli; Layered elastic analysis; Repeatability
• Subject Areas: Data and Information Technology; Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00497314
• Record Type: Publication
• ISBN: 0-309-04624-6
• Files: TRIS, TRB, ATRI
• Created Date: Sep 30 1990 12:00AM