USE OF LARGE STONE ASPHALTIC CONCRETE OVERLAYS OF FLEXIBLE PAVEMENTS

The main objectives of the study were: (a) to investigate, by laboratory testing, the general behavior and performance of a large stone binder mix in terms of resistance to cracking and rutting, which are the main forms of pavement distress; (b) to use the mix characteristics developed by laboratory testing, and the VESYS 3AM pavement performance prediction model, to estimate the performance of a test pavement section rehabilitated with a large stone binder mixture; and (c) to monitor, in cooperation with the North Carolina Department of Transportation (NCDOT), the post-construction performance of the large stone mixture field sections. The NCDOT identified U.S. Highway 70 as a candidate test pavement section. The pavement had deteriorated and was in need of rehabilitation to increase its level of service. Overlays were designed individually for the east and the west bound travel lanes due to the differences in their cross sectional thickness and material properties. An actual sample of the large stone binder mixture that was used in the rehabilitation of the field test section was supplied by NCDOT. This mixture was compacted to the specified field density in the laboratory using the gyratory testing machine. The compacted samples were then characterized in terms of the fatigue, creep and resilient modulus. These tests revealed that the resilient modulus of the large stone binder mixture is about two times greater than the modulus of a conventional binder mixture. The permanent deformation of the large stone mixture was also found to be lower than a conventional binder mixture under most test conditions. However, at high temperatures and long loading times, the conventional binder mixture did have a slightly lower permanent deformation than the large stone mixture. The large stone mixture had a longer fatigue life than the conventional mixture, but only at initial strain values greater than 0.0005. At lower initial strain values, the conventional mixture had a longer fatigue life.

• Corporate Authors:

  North Carolina State University, Raleigh

  Center for Transportation Engineering Studies, P.O. Box 7908
  Raleigh, NC  United States  27695

  North Carolina Department of Transportation

  P.O. Box 25201, 1 South Wilmington Street
  Raleigh, NC  United States  27611

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Khosla, N P
  • Malpass, G A
• Publication Date: 1997-8

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: 84 p.

Subject/Index Terms

• TRT Terms: Aggregate gradation; Aggregate mixtures; Asphalt concrete; Computer models; Creep; Deformation; Driver rehabilitation; Flexible pavements; Fracture mechanics; Laboratory tests; Mechanical fatigue; Modulus of resilience; Monitoring; Pavement overlays; Pavement performance; Rutting; Stone; Test sections
• Uncontrolled Terms: Fatigue life; Large stone mixtures; Rehabilitation
• Subject Areas: Design; Geotechnology; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00745707
• Record Type: Publication
• Report/Paper Numbers: FHWA/NC/96-004, Final Report
• Contract Numbers: 23241-94-7
• Files: TRIS, ATRI, USDOT, STATEDOT
• Created Date: Feb 13 1998 12:00AM