THE BEHAVIOUR OF BITUMINOUS SURFACINGS IN ASPHALT PAVEMENTS

THE THESIS DESCRIBES WORK CARRIED OUT TO ESTABLISH THE FACTORS WHICH CONTRIBUTE TO FATIGUE AND CRACKING OF BITUMINOUS SURFACINGS AND THE CONDITIONS UNDER WHICH GAP-GRADED MIXTURES CAN MOST EFFECTIVELY BE USED TO PROLONG THE FATIGUE LIFE OF THESE SURFACINGS. LABORATORY SPECIMENS AND IN SITU MEASUREMENTS ON AN EXPERIMENTAL ROAD WERE USED TO STUDY THE FACTORS INVOLVED IN FATIGUE. THE RESULTS SHOWED THE NEED FOR TAKING INTO ACCOUNT THE STRESS NON-LINEARITY OF THE RESILIENT MODULUS OF THE UNBOUND CRUSHER-RUN MATERIAL IN THE BASE. PROPOSALS ARE PUT FORWARD FOR THE MODIFICATION OF CURRENT DESIGN METHODS, INCLUDING THOSE WHICH TAKE ACCOUNT OF ENVIRONMENTAL CONDITIONS, TRAFFIC, MATERIAL PROPERTIES AND DIFFERENT SURFACING THICKNESSES. THE PROPOSALS WOULD ENABLE THESE METHODS TO BE APPLIED TO THE DESIGN OF THIN AND INTERMEDIATE SURFACINGS, AND THE INITIATION OF FATIGUE AND CRACKING TO BE PREDICTED. THE RESEARCH REVEALS THAT GAP-GRADED MIXTURES HAVE A LOWER STIFFNESS, GREATER VOID HOMOGENEITY AND GREATER RESISTANCE TO CRACK PROPAGATION THAN CONTINOUSLY- GRADED ASPHALTIC CONCRETE MIXTURES. /TRRL/

  • Corporate Authors:

    Natal University /S Africa

    ,    
  • Authors:
    • Freeme, C R
  • Publication Date: 1971-8

Language

  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: v+460 pp

Subject/Index Terms

Filing Info

  • Accession Number: 00211934
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Thesis
  • Files: TRIS
  • Created Date: Nov 14 1973 12:00AM