The Pennsylvania State Test Track, which was completed in August 1972, will be used to develop engineering data and criteria for the design and construction of new pavements and for the improvement and maintainance of existing pavements. The test track is composed of sections with various base-course materials and different layer thicknesses. This paper presents the results of performance analyses for sections containing bituminous-concrete base. The analysis was made by using an elastic-layer computer program; only the spring weather condition was considered. Critical responses analyzed were maximum vertical compressive strain at the top of the subgrade, maximum radial tensile strain at the bottom of the base course, and maximum deflection on the pavement surface. Performance data collected included present serviceability index, rut depth, and cracking. Correlations between critical responses and pavement performance were established. These correlations permit prediction of pavement performance from pavement response determined in the spring season. A maximum compressive strain of 450 mu m/m (0.000450 in./in.) at the top of the subgrade, a maximum tensile strain of 120 mu m/m (0.000120 in./in.) at the bottom of the base course, and a maximum deflection of 0.51 mm (0.020 in.) on the pavement surface were established as the limiting criteria for flexible pavements with bituminous bases to withstand 1,000,000 applications of an 8165-kg (18-kip) axle load without significant fatigue cracking. Based on these limiting criteria, structural coefficients of the bituminous-concrete base and the crushed-limestone subbase were developed. The structural coefficients vary significantly with layer thickness. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 21-27
  • Monograph Title: Design and performance of pavement overlays
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00173942
  • Record Type: Publication
  • ISBN: 030902658X
  • Files: TRIS, TRB
  • Created Date: May 18 1978 12:00AM