THE EFFECT OF VARYING THE MODULUS AND THICKNESS OF ASPHALTIC CONCRETE SURFACING MATERIALS

This report is a theoretical study of the effects of varying the modulus and thickness of asphalt concrete surfacing materials. Three typical flexible pavement design problems at two levels of hot mix asphaltic concrete (HMAC) elastic modulus are analyzed using linear elastic theory. Specific findings are: (1) the use of an HMAS modulus which is much higher than the base course modulus, is discouraged, (2) if a high HMAC - base course modular ratio cannot be avoided, then one should avoid the range from 1 inch to 6 inches of HMAC thickness, and (3) the softening of the base material immediately under the surface layer results in higher tensile stresses at the bottom of the surface layer, and accelerates fatigue deterioration of the pavement.

• Record URL:
  • https://library.ctr.utexas.edu/hostedpdfs/tti/123-24.pdf
• Record URL:
  • https://rosap.ntl.bts.gov/view/dot/81815
• Corporate Authors:

  Texas Transportation Institute

  Texas A&M University System, 1600 E Lamar Boulevard
  Arlington, TX  United States  76011
• Authors:
  • Lu, D Y
  • Scrivner, F H
• Publication Date: 1974-10

Media Info

• Media Type: Digital/other
• Pagination: 55 p.

Subject/Index Terms

• TRT Terms: Asphalt concrete; Cracking; Design; Flexible pavements; Formulations; Highways; Hot mix asphalt; Mechanical elasticity; Mechanical fatigue; Modulus of elasticity; Pavement base course; Pavement cracking; Pavement design; Tension; Thickness
• Uncontrolled Terms: Crack propagation; Tensile stress
• Subject Areas: Design; Highways; Materials; Pavements;

Filing Info

• Accession Number: 00091550
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: TTI-1-8-69-123-24 Intrm Rpt.
• Files: NTIS, NTL, TRIS
• Created Date: Aug 13 1975 12:00AM