ESTABLISHING MATERIAL PROPERTIES FOR THIN ASPHALT CONCRETE SURFACES ON GRANULAR BASES. INTERIM REPORT
This report includes the results of an analytical study of thin asphalt pavements over flexible bases to define the engineering properties required for adequate performance. Since truck tire pressures have dramatically increased in recent years, included are the effects of the increased tire pressures on surface tensile strains, base shear stresses, and subgrade compressive strains. A finite element computer program developed for the FHWA was used to calculate vertical and horizontal surface shear pressure distribution for a bias ply truck tire inflated to both 75 and 125 psi. A series of ILLIPAVE runs was made to determine the horizontal tensile strains, lateral shear stresses, and vertical compressive strains for asphalt concrete surfaces 1, 1.5, 2, and 4 inches thick over 8- and 14-inch granular bases having three different moduli and a subgrade soil that is stress-sensitive with an initial modulus of 10 ksi. These results showed that some thin pavement structures cannot provide adequate service, and that design procedures must be upgraded to include materials more resistant to higher strains. To provide adequate service, these surfaces should be either flexible and thin on a stiff, thick base, or be stiff and thick.
- Research performed in cooperation with the Federal Highway Administration. Research Study Title: Performance Considerations and Specifications of Hot-Mix Asphaltic Concrete.
Arlington, TX United States 76011
Texas State Department of Highways & Public TransportationTransportation Planning Division, P.O. Box 5051
Austin, TX United States 78763
Washington, DC United States 20590
- Roberts, F L
- Rosson, B T
- Publication Date: 1985-11
- Features: Appendices; Figures; References; Tables;
- Pagination: 157 p.
- TRT Terms: Asphalt concrete; Bias ply tires; Compressive strength; Computer programs; Finite element method; Granular bases; Inflation; Pavement performance; Properties of materials; Shear stress; Strain (Mechanics); Subgrade (Pavements); Tension; Tire pressure; Tires; Trucks
- Old TRIS Terms: Compressive strain; Finite elements
- Subject Areas: Design; Geotechnology; Highways; Materials; Motor Carriers; Pavements; Vehicles and Equipment; I22: Design of Pavements, Railways and Guideways;
- Accession Number: 00457700
- Record Type: Publication
- Report/Paper Numbers: FHWA-TX-85-74+345-1
- Contract Numbers: Study 2-9-84-345
- Files: TRIS, USDOT, STATEDOT
- Created Date: Aug 31 1986 12:00AM