AASHO ROAD TEST FINDINGS APPLIED TO FLEXIBLE PAVEMENTS IN VIRGINIA

RESULTS ARE REPORTED ON AN INVESTIGATION OF THE STRUCTURAL PERFORMANCE OF ABOUT TWENTY SATELLITE PAVEMENTS ON PRIMARY AND INTERSTATE ROADS IN THE PIEDMONT REGION OF VIRGINIA. TENTATIVE EVALUATION WAS MADE OF THE STRENGTH COEFFICIENTS OF THE MATERIALS BASED ON AASHO ROAD TEST RESULTS TO IMPROVE THE DESIGN METHOD PRESENTLY USED. THE INDEPENDENT VARIABLES EVALUATED ARE (1) THE THICKNESS OF THE LAYERS OF THE PAVEMENT, (2) THE STRENGTH COEFFICIENTS OF THE MATERIALS IN EACH LAYER OF THE PAVEMENT, (3) SUBGRADE STRENGTH, AND (4) TRAFFIC. THE CLIMATIC CONDITIONS WERE TREATED AS A CONSTANT. THE DEPENDENT VARIABLES CONSIDERED WERE: (1) STRUCTURAL PERFORMANCE DETERMINED FROM THE BENKELMAN BEAM REBOUND DEFLECTIONS MEASURED AND, (2) QUALITY PERFORMANCE BASED ON SERVICEABILITY INDEX VALUES OBTAINED BY THE BPR ROUGHOMETER. STEPWISE REGRESSION ANALYSIS WAS USED TO EVALUATE THE VALUES OF STRENGTH COEFFICIENTS AND THEIR EFFECT ON PAVEMENT DESIGN. THICKNESS EQUIVALENCY VALUES (STRENGTH COEFFICIENTS) OF ASPHALTIC CONCRETE, TREATED AND UNTREATED BASE MATERIALS, SELECT MATERIAL, SOIL TREATED CEMENT, AND SUBGRADE WERE DETERMINED. BENKELMAN BEAM REBOUND DEFLECTIONS AND PAVEMENT THICKNESS INDICES WERE CORRELATED. A NEW CONCEPT OF DESIGN BASED ON PAVEMENT RIGIDITY AND FLEXIBILITY WAS CONSIDERED AND PERMISSIBLE AND TOLERABLE LIMITS OF DEFLECTION AS A FUNCTION OF PAVEMENT RIGIDITY RECOMMENDED. IT WAS CONCLUDED THAT: (1) STRUCTURAL PERFORMANCE OF PAVEMENT CAN BE EVALUATED FROM RESULTS OF BENKELMAN BEAM TEST, (2) A POOR CORRELATION WAS FOUND BETWEEN SOIL SUPPORT VALUES DETERMINED BY THE VIRGINIA CBR TEST METHOD AND THOSE PRESENTED BY THE AASHO DESIGN COMMITTEE, (3) THE FOLLOWING THICKNESS EQUIVALENCY VALUES WERE DEVELOPED: ASPHALT CONCRETE, 1.00, STONE BASE, 0.35, CEMENT-TREATED BASE, 1.1 ASPHALT-TREATED BASE, 0.75 SELECT MATERIAL, 0.00 AND CEMENT-TREATED SOIL 0.50, AND (4) TOLERABLE PAVEMENT DEFLECTION IS A FUNCTION OF ITS RIGIDITY, AND (5) A RELATIONSHIP BETWEEN LOSS IN SERVICEABILITY AND TRAFFIC LOADINGS WAS DEVELOPED. A TENTATIVE PAVEMENT DESIGN METHOD BASED ON STRUCTURAL PERFORMANCE IS PROPOSED FOR USE IN VIRGINIA.

  • Supplemental Notes:
    • Hpr-1/3/, BPR-5, STATE-0356
  • Corporate Authors:

    Virginia Highway Research Council

    Charlottesville, VA  United States 
  • Authors:
    • Vaswani, N K
  • Publication Date: 1967-9

Subject/Index Terms

Filing Info

  • Accession Number: 00205352
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Jan 16 1994 12:00AM