A NEW APPROACH IN ASPHALT RHEOLOGY

ARGUMENTS ARE PRESENTED FOR THE NEED OF USING RHEOLOGY IN SPECIFICATIONS FOR PAVING ASPHALT. THE NEED FOR DETERMINING THE DEFORMATION CHARACTERISTICS EMPLOYING ASPHALT INVARIANT PARAMETERS WITH THE OBJECTIVE THAT SUCH RESULTS WILL BE USEFUL IN BRIDGING THE GAP FROM THE SCIENTIFIC MEASUREMENT OF ASPHALT TO THE UTILIZATION IN THE DESIGN OF BETTER FLEXIBLE PAVEMENTS. A REVIEW OF RECENT PUBLICATIONS PERTINENT TO THE SUBJECT IS INCLUDED AND REFERS IN PARTICULAR TO THE MORE SOPHISTICATED CONSIDERA- TIONS OF RHEOLOGY PHENOMENOLOGICAL BEHAVIOR. FROM THIS BACKGROUND, A NEW METHOD OF CHARACTERIZING THE RHEOLOGY OF ASPHALT IS PROPOSED AS BEING MORE RIGOROUS AND, IT IS HOPED, MORE USEFUL FOR DESIGN PURPOSES. THE PROCEDURE DESCRIBED USES THE INSTRON TESTING MACHINE WITH AN ENVIRONMENT CHAMBER AND A COMPRESSION TEST IN WHICH THE BASIC CONCEPT OF COMPRESSIBILITY IS UTILIZED FOR EVALUATING THREE RHEOLOGICAL PARAMETERS. THESE PARAMETERS ARE THE STRESS-STRAIN RELATION AT A ZERO RATE OF STRAIN CONDITION, A MEASUREMENT OF CONSISTENCY RELATED TO CLASSICAL VISCOSITY, AND A CHARACTERISTIC TIME, WHICH IS A MEASURE OF THE MEMORY OF PREVIOUS STRAINS THAT THE MATERIAL RETAINS AND THAT INFLUENCE ITS RHEOLOGICAL BEHAVIOR. THESE THREE INDEPENDENT MATERIAL PARAMETERS ARE SUFFICIENT TO DESCRIBE THE ASPHALT FOR ALL RHEOLOGICAL PURPOSES. LINE DIAGRAMS ARE PRESENTED TO ILLUSTRATE THE PROCEDURE AND AN EXAMPLE OF THE PROPOSED ANALYSIS FOR AN 85 TO 100 PENETRATION ASPHALT IS GIVEN. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 1-11
  • Monograph Title: Bituminous materials and mixes
  • Serial:

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Filing Info

  • Accession Number: 00211432
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 29 1994 12:00AM