IMPROVEMENTS TO PAVEMENT SUBGRADE STRAIN CRITERION

Relationships between maximum allowable elastic strain on the subgrade and number of load repetitions have been used extensively in pavement design procedures. Their development is reviewed to allow a proper perspective on their correct use and as a background for describing improvements which take account of the differing deformation resistance offered by various asphalt mixtures. These improvements are derived from both field data and the results of an extensive testing program during the last four years at the University of Nottingham using repeated load triaxial tests. A continuously graded dense bitumen macadam base can carry more than 1- one-half times the number of load applications before developing the same limiting rut depth as a gap graded hot rolled asphalt of equal elastic stiffness. Factors on the design life against permanent deformation are given for four typical materials for use in conjunction with the subgrade strain criterion.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339445
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • BROWN, S F
  • Brunton, J M
• Publication Date: 1984-11

Media Info

• Features: References;
• Pagination: p. 551-567
• Serial:
  • Journal of Structural Engineering
  • Volume: 110
  • Issue Number: 6
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9445
  • Serial URL: http://ascelibrary.org/loi/jsendh

Subject/Index Terms

• TRT Terms: Accelerated tests; Asphalt; Asphalt mixtures; Bitumen; Cracking; Deformation; Design; Failure; Fatigue cracking; Gap grading; Loads; Macadam; Mechanical strain; Pavement design; Pavement subgrade; Pavements; Repeated loads; Stiffness; Structural design; Testing; Triaxial shear tests
• Uncontrolled Terms: Design criteria; Permanent deformation
• Old TRIS Terms: Continuous grading; Resistance; Strains
• Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 00393375
• Record Type: Publication
• Source Agency: Engineering Index
• Files: TRIS
• Created Date: May 31 1985 12:00AM