DEVELOPMENT OF A RATIONALLY BASED AASHO ROAD TEST ALGORITHM

A new design algorithm for flexible pavements that uses performance data from the AASHO Road Test and layered-elastic theory is described. The algorithm, developed by correlating road test data with subgrade vertical strain calculated by the layered-elastic program ELSYM5, allows the characterization of seasonal variation in pavement strength and traffic volume and is implemented in a pavement design and management system. A comparison between the original design equation and the subgrade strain algorithm indicates that the latter is about 5.6 percent more accurate in correlating with road test performance data. However, the major advantage of the subgrade strain algorithm is that the pavement is characterized by using the modulus of elasticity of each layer, which allows consideration of seasonal variation and is a more rational basis for the extrapolation of results. When implemented in a pavement management system, the algorithm considers different axle loads separately by using the concept of cumulative damage; thus there is no need to convert mixed traffic to equivalent axle loads. It was also found that equivalent axle loads can vary significantly with different pavement structures. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 10-17
  • Monograph Title: Application of pavement design models
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00331251
  • Record Type: Publication
  • ISBN: 0309031095
  • Files: TRIS, TRB
  • Created Date: Aug 15 1981 12:00AM