EFFECT OF TRUCK TIRE CONTACT PRESSURE. FINAL REPORT

A survey of truck tire pressures was conducted at numerous sites around Arkansas. The average inflation pressure was found to be 105 psi with pressures in excess of 120 psi not being uncommon. In comparison, the AASHTO Guide for Design of Pavement Structures is based on empirical data in which truck tire pressures did not exceed about 80 psi. This study examined the effect of the higher pressure on pavement performance and included laboratory measurement of tire contact pressures at various inflation pressures and loads. The major effect was found to be increased rutting potential within the upper 2 to 3 in. of asphalt surfacing. This effect cannot be taken into account in thickness design but must be considered in material selection. Other effects are increased fatigue cracking and greater rut development in the base, subbase, and subgrade. Recommendations for thickness design modifications to account for these effects are presented.

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 162 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00622322
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/AR-91/006, UAF-AHTRC-91-001
  • Contract Numbers: TRC-8902
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: May 31 1992 12:00AM