ASPHALT MIXTURE BEHAVIOR IN REPEATED FLEXURE

A SUBSYSTEM OF THE PAVEMENT DESIGN SYSTEM WAS PRESENTED TO CONSIDER THE FATIGUE MODE OF DISTRESS. THE PROPOSED PROCEDURE PERMITS THE INCORPORATION OF REALISTIC MATERIAL PROPERTIES (IN THE ENGINEERING SENSE) WITHIN THE FRAMEWORK OF MULTILAYER ELASTIC THEORY (AT THE PRESENT TIME) TO DEFINE THE POTENTIAL FOR CRACKING OF THE PAVEMENT STRUCTURE UNDER REPETITIVE LOADING. AS INDICATED IN THE REPORT, THE PROCEDURE CAN BE USED EITHER FOR DESIGN PURPOSES OR FOR CHECKING THE ADEQUACY OF EXISTING PAVEMENTS. IN USING THE PROCDEDURE FOR CHECKING AN IN-SERVICE PAVEMENT NEAR MORRO BAY, DISTRESS WHICH HAD ACTUALLY OCCURRED WAS PREDICTED. HOWEVER, THE TIME PERIOD IN WHICH CRACKING WAS ESTIMATED TO DEVELOP WAS SOMEWHAT SHORTER THAN THAT WHICH ACTUALLY OCCURRED IN SERVICE. POSSIBLE REASONS FOR THE DESCREPANCY ARE OFFERED. IN SPITE OF THERE LIMITATIONS, THE SYSTEM HAS BEEN SHOWN TO BE RESPONSIVE TO ACTUAL CONDITIONS SINCE DISTRESS WHICH WAS SUBSEQUENTLY OBSERVED WAS PREDICTED IN ADVANCE. THE STRENGTH OF SUCH A SYSTEM WOULD APPEAR TO LIE IN ITS USEFULNESS AS A DESIGN TOOL SINCE IT HAS THE POTENTIAL TO CONSIDER A NUMBER OF FACTORS NOT UTILIZED IN PRESENT DAY DESIGN PROCEDURES. IT SHOULD ALSO BE EMPHASIZED THAT THIS TYPE OF APPROACH HAS NOT BEEN DESIGNED TO REPLACE EXISTING TECHNIQUES BUT RATHER TO BE USED IN CONJUNCTION WITH EXISTING PROCEDURES. RELATIVE TO THE DATA ON MIX VARIABLES, IN TESTS OF THE CONTROLLED-STRESS TYPE, STIFFNESS, AS HAS ALREADY BEEN EMPHASIZED, IS AN IMPORTANT MIX VARIABLE. IN THE LIGHT OF THE MORRO BAY PROJECT AND FROM OTHER DATA, IT APPEARS NECESSARY TO DEVELOP FATIGUE DATA AT HIGHER TEMPERATURES (LOW STIFFNESSES) THAN THOSE WHICH HAVE BEEN UTILIZED THUS FAR IN THE PROJECT. THIS WOULD APPEAR PARTICULARLY NECESSARY IN ORDER TO ANALYZE THE PERFORMANCE OF COMPARATIVELY THIN PAVEMENTS. THE DATA ALSO INDICATE THAT A WORTHWHILE FIELD EXPERIMENT WOULD BE TO CONSTRUCT AN ASPHALT-BOUND BASE COURSE UTILIZING A MIX SIMILAR TO THAT SUGGESTED BY THE B. S. 594 SPECIFICATIONS. /AUTHOR/

  • Corporate Authors:

    University of California, Berkeley

    Berkeley, CA  United States  94720

    California Division of Highways

    Bridge Department
    Sacramento, CA  United States  05914

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • Monismith, C L
    • Epps, J A
    • Kasianchuk, D A
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00210438
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Report/Paper Numbers: No D-6-1
  • Files: TRIS
  • Created Date: Jul 6 1970 12:00AM