EVALUATION OF STRUCTURAL COEFFICIENTS OF STABILIZED BASE-COURSE MATERIALS

The structural coefficients of two stabilized base-course materials--bituminous concrete and aggregate cement--are evaluated by using two different methods of analysis: the American Association of State Highway and Transportation Officials (AASHTO) performance analysis and the limiting-criteria approach. The AASHTO performance analysis is based on the field performance of 11 bituminous concrete pavements and three aggregate cement pavements; the limiting-criteria approach is based on maximum tensile strain at the bottom of the base course, maximum compressive strain at the top of the subgrade, and maximum pavement surface deflection. The test pavements were constructed at the Pennsylvania Transportation Research Facility. The field performance data collected were rutting, cracking, and present serviceability index. Limiting criteria were developed by using the BISAR computer program and the rutting and cracking data for the test pavement. Results of the evaluation show good agreement between the two methods of analysis. The structural coefficients of the base-course materials were found to vary with many factors, such as the thickness and stiffness of each pavement constituent layer, structural coefficients of other pavement layers, and pavement life. It is concluded that it is very difficult to assign a constant value to the structual coefficient of a base-course material. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 58-67
  • Monograph Title: Pavement systems: assessment of load effects, design, and bases
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00308546
  • Record Type: Publication
  • ISBN: 0309029759
  • Files: TRIS, TRB
  • Created Date: Apr 22 1980 12:00AM