A practical scheme for evaluating and rehabilitating flexible pavements is presented. It considers safety, riding quality, the strength as primary factors for evaluating the condition of a roadway. Criteria for safety are not discussed. Riding quality standards are expressed through the Present Serviceability Index, PSI. Terminal Servicability Indices, TSI's are established for interstate, Principal, Minor Arterial, Collector and Local Access Highways from PSI distributions obtained on 5,492 miles of flexible pavement. These TSI's are shown to be flexible and dependent upon funding and construction capability. Thus flexible failure criteria for each type of highway are estabilished. Spring deflections measured through the dynamic deflection measuring device Road Rater are used to assess pavement strength. Correction curve for surface temperature and adjustment factors for season are established to facilitate comparison under standard conditions. Permissible deflections on crushed stone bases for various failure critera are drawn from the AASHO Road Test data. Permissibile deflections on bituminous concrete bases are established from a study of ten sections of a test track facility located at State College, PA. /Author/

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 663-673

Subject/Index Terms

Filing Info

  • Accession Number: 00170242
  • Record Type: Publication
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Mar 29 1978 12:00AM