CRITICAL REVIEW OF FLEXIBLE PAVEMENT PERFORMANCE AND DESIGN EQUATIONS

IN 1962 THE AMERICAN ASSOCIATION OF STATE HIGHWAY OFFICIALS PRESENTED A METHOD FOR THE DESIGN OF FLEXIBLE HIGHWAY PAVEMENTS WHICH WAS BASED ON A LARGE SCALE FIELD STUDY. THE STEPS IN THE DEVELOPMENT OF THE BASIC DESIGN METHOD AND THE ASSUMPTIONS NECESSARY FOR ITS APPLICATION ARE ENUMERATED AND CRITICALLY DISCUSSED. THE CONCEPT OF HIGHWAY PERFORMANCE WAS THE BASIS UPON WHICH THE ROAD TEST WAS EVALUATED. THE SIGNIFICANCE AND VALIDITY OF USING PERFORMANCE EXPRESSIONS TO ESTIMATE PAVEMENT LIFE AND STRENGTH AR DISCUSSED. THE INDIVIDUAL DESIGN VARIABLES, WHICH INCLUDE STRUCTURAL COEFFICIENTS, SOIL SUPPORT, TRAFFIC INTENSITY AND REGIONAL FACTORS ARE PRESENTED. CURRENTLY AVAILABLE METODS FOR DETERMINING EACH OF THESE VARIABLES ARE EXAMINED AND EVALUATED. THE IMPORTANCE OF SELECTING APPROPRIATE VALUES FOR THE DESIGN VARIABLES WHEN CALCULATING THE PAVEMENT LIFE IS DISCUSSED. ALTHOUGH IT HAS RECEIVED WIDESPREAD ACCEPTANCE, THE AASHO DESIGN METHOD HAS SERIOUS LIMITATIONS. NONE OF THE ATTEMPTS TO ADOPT THE PROCEDURE TO AN INDIVIDUAL STATE'S REQUIREMENTS HAVE BEEN ENTIRELY SUCCESSFUL. THE NEED FOR A CLEARER DEFINITION OF MATERIAL PROPERTIES, AND THEIR RELATIONSHIP TO THE STATISTICALLY BASED AASHO DESIGN VARIABLES, IS INDICATED. /AUTHOR/

Subject/Index Terms

Filing Info

  • Accession Number: 00205378
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: 67-17
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Aug 8 1971 12:00AM