USING THE MULTIDEPTH DEFLECTOMETER TO STUDY TIRE PRESSURE, TIRE TYPE, AND LOAD EFFECTS ON PAVEMENTS. INTERIM REPORT

In this study the impact of truck tire type, inflation pressure, speed, and axle load was examined by measuring depth deflections in two pavement structures (one thick, one thin) instrumented with multidepth deflectometers (MDDs). Measured depth deflections under truck loadings were converted into average vertical compressive strains in the pavement layers. The measured subgrade strains were used to estimate the time to rutting failure. Deflections measured at the bottom of the asphaltic concrete layer were used to calculate the surface curvature index which was then translated into tensile strains at the bottom of the layer. This report develops multiple linear regression models to predict the relationship between dependent variables (subgrade strain, tensile strain at the bottom of asphalt layer) and independent variables (speed, lateral offset, asphalt layer temperature, and axle load). For the same load level, the wide based super single tires were measured to cause higher deflections, higher vertical compressive subgrade strains, and have sharper curvature to the deflection bowls than standard dual tires. Under similar loading conditions, wide based tires were predicted to be at least twice as damaging as conventional dual tires.

• Record URL:
  • https://library.ctr.utexas.edu/hostedpdfs/tti/1184-2-V2.pdf
• Record URL:
  • https://rosap.ntl.bts.gov/view/dot/81988
• Supplemental Notes:
  • Research study title: Using the Multidepth Deflectometer to Study Tire Pressure and Dynamic Load Effects on Pavements.
• Corporate Authors:

  Texas Transportation Institute

  Texas A&M University System, 1600 E Lamar Boulevard
  Arlington, TX  United States  76011

  Texas Department of Transportation

  Transportation Planning Division, P.O. Box 5051
  Austin, TX  United States  78763

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Akram, T
  • Scullion, T
  • Smith, R E
• Publication Date: 1993-11

Language

• English

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; References; Tables;
• Pagination: 142 p.

Subject/Index Terms

• TRT Terms: Asphalt concrete; Axle load force; Deflection; Deflectometers; Inflation; Linear regression analysis; Motor vehicles; Multiple regression analysis; Pavement layers; Rutting; Speed; Subgrade (Pavements); Tension; Tire pressure; Tires; Traffic speed; Trucks; Vehicle design
• Old TRIS Terms: Multidepth deflectometers; Multiple regression; Tire design; Truck pavement damage; Vertical compressive strains; Wide based tires
• Subject Areas: Design; Highways; Motor Carriers; Pavements; Vehicles and Equipment; I23: Properties of Road Surfaces; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 00662789
• Record Type: Publication
• Report/Paper Numbers: FHWA/TX-92/1184-2 Vol 2
• Contract Numbers: Study 2-18-89-1184
• Files: NTL, TRIS, USDOT, STATEDOT
• Created Date: Jul 6 1994 12:00AM