RELATIONSHIP BETWEEN PERMANENT DEFORMATION OF ASPHALT CONCRETE AND MOISTURE SENSITIVITY

In recent years, the Nevada Department of Transportation has observed cases of severe rutting during the first warm weather following a chip seal application. Cores from these pavements have shown evidence of severe stripping. Sealing the surface appears to accelerate moisture damage by trapping moisture that would otherwise escape in the pavement layers. This observation led to the hypothesis that rutting was occurring in the asphalt concrete layer owing to a loss of cohesion and shear strength as a result of moisture damage. To test this hypothesis, a preliminary study was undertaken to determine if moisture susceptibility was related to permanent deformation. Samples from behind the paver were collected from 20 Nevada construction projects during 1985 and 1986. These materials were compacted, and a preliminary creep test described by ASTM was performed to determine the permanent strain. Samples from each of these projects were moisture conditioned, and a strain ratio (i.e., conditioned percent strain divided by unconditioned percent strain) was developed to relate unconditioned to conditioned results. Conclusions from this research were that moisture conditioning appears to play a significant role in permanent deformation. A preliminary multiple regression equation was developed by using strain ratio and daily 18,000-lb equivalent single-axle loads (ESALs) to predict average project rut depth. This equation yielded a correlation coefficient of 0.70.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1990/1259/1259-016.pdf
• Record URL:
  • https://scholar.google.com/scholar_lookup?title=RELATIONSHIP+BETWEEN+PERMANENT+DEFORMATION+OF+ASPHALT+CONCRETE+AND+MOISTURE+SENSITIVITY&author=N.+Krutz&author=M.+Stroup-Gardiner&publication_year=1990
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• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1259, Chip Seals, Friction Courses, and Asphalt Pavement Rutting 1990.Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Krutz, Neil C
  • Stroup-Gardiner, Mary
• Publication Date: 1990

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 169-177
• Monograph Title: Chip seals, friction courses, and asphalt pavement rutting 1990
• Serial:
  • Transportation Research Record
  • Issue Number: 1259
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Asphalt concrete; Chip seals; Creep tests; Deformation; Equations; Forecasting; Loss and damage; Moisture damage; Multiple regression analysis; Ruts (Pavements); Rutting; Strain (Mechanics); Stripping (Pavements); Water
• Uncontrolled Terms: Rut; Rut depth; Strain rate
• Geographic Terms: Nevada
• Old TRIS Terms: Multiple regression
• Subject Areas: Geotechnology; Highways; Materials; Pavements; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials; I36: Aggregates;

Filing Info

• Accession Number: 00600677
• Record Type: Publication
• ISBN: 0309050162
• Files: TRIS, TRB
• Created Date: Oct 31 1990 12:00AM