The San Diego County experimental base project consists of 35 test sections designed to determine thickness requirements for five full-depth asphalt bases and two untreated granular bases. Testing was discontinued in 1973 after 7 years of traffic. This experiment was planned to determine specific thicknesses of various types of base courses required to give a desired level of performance, to relate certain measured properties of the pavement and pavement components to observed performance, and to study deflection and strain behavior of the test pavements to provide a better theoretical basis for translating future performance results to other environments. This paper is concerned with the first two objectives. Four full-depth asphalt bases were analyzed, and their relative thickness requirements were determined and related to pavement performance measured by a performance rating system and by the present serviceability index. Under test conditions and limitations of the analysis, it was possible to develop significant relationships between a panel rating of test section performance and the deflection and equivalent thickness for four full-depth asphalt base sections included in the experiment. The data did not yield significant relationships with either traffic of present serviceability index. Base weighting factors, relative to a high-quality asphalt concrete base, were developed from the analysis for asphalt cement, cutback asphalt, and emulsion-asphalt-treated bases by using a marginal quality sandy gravel aggregate.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 47-59
  • Monograph Title: Asphalt concrete pavement design and evaluation
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00095731
  • Record Type: Publication
  • ISBN: 0309023661
  • Files: TRIS, TRB
  • Created Date: Jul 2 1975 12:00AM