THE APPLICABILITY OF THE ABSOLUTE RATE THEORY IN EXPLAINING THE BEHAVIOR OF BITUMINOUS MATERIALS

THE ABSOLUTE RATE THEORY WAS INVESTIGATED FOR APPLICATION TO ASPHALTIC MATERIALS. THIS THEORY IS BASED UPON THE ASSUMPTION THAT THE MECHANICS OF FLOW CONSISTS OF THE MOVEMENT OF ATOMS, MOLECULES, OR GROUPS OF MOLECULES (FLOW UNITS) INTO VACANCIES IN THE MATERIAL OR BY THE DISPLACEMENT OF THE VACANCIES THEMSELVES AND THAT FOR THIS MOVEMENT TO TAKE PLACE A STRAIN ENERGY BARRIER MUST BE OVERCOME. SINCE AN EXTERNAL SHEARING FORCE WAS APPLIED TO THE ASPHALTS IN THIS STUDY, THE BASIC ABSOLUTE RATE RELATIONSHIP FOR AN EQUILIBRIUM CONDITION HAD TO BE MODIFIED. THE DERIVATION OF THIS EQUATION IS GIVEN. A WIDE RANGE OF ASPHALTS WERE TESTED TO STUDY THE APPLICABILITY OF THIS THEORY TO ASPHALT. THEY DIFFERRED WITH RESPECT TO PENETRATION, SOURCE, AND METHOD OF MANUFACTURE. NEEDED DATA ON THE RELATIONSHIPS BETWEEN THE SHEAR STRESS AND THE RESULTING RATE OF SHEAR OF THE ASPHALTS WERE OBTAINED FROM EXPERIMENTS PERFORMED ON A MODIFIED SLIDING PARALLEL-PLATE MICROVISCOMETER. THE ABSOLUTE RATE EQUATION INDICATES THAT THE SHEAR RATE, SHEAR STRESS AND TEMPERATURE ARE INTERDEPENDENT. THEREFORE, EXPERIMENTS WERE RUN IN WHICH TWO OF THESE PARAMETERS WERE VARIED TO OBTAIN THE THIRD. IT IS CONCLUDED THAT RESULTS ARE APPLICABLE TO PURE BITUMINOUS MATERIALS IN GENERAL, BUT IT IS NOT KNOWN WHETHER THE SAME CONCLUSIONS WOULD ALSO BE APPLICABLE TO ASPHALTS WHEN PRESENT IN BITUMINOUS MIXTURES. RESULTS SHOW THAT, REGARDLESS OF THE CONSISTENCY AND PROBABLY THE METHOD OF MANUFACTURE AND THE SOURCE, A HYPERBOLIC SINE RELATIONSHIP EXISTS BETWEEN THE SHEAR STRESS AND THE SHEAR RATE. THE ABSOLUTE RATE THEORY SEEMS TO BE APPLICABLE FOR EXPLAINING THE FLOW BEHAVIOR OF THE ASPHALTS STUDIED OVER A WIDE RANGE OF TEMPERATURE. BITUMINOUS MATERIALS APPEAR TO HAVE A HIGH ENTROPY WHICH COINCIDES WITH THE HIGH TEMPERATURE SUSCEPTIBILITY OF THE MATERIAL.

• Supplemental Notes:
  • Vol 35, pp 1-18, 9 FIG, 5 TAB, 6 REF
• Authors:
  • Herrin, M
  • Marek, C R
  • Strauss, R
• Conference:
  • Assoc Asphalt Paving Technol Proc
• Publication Date: 1966-2

Subject/Index Terms

• TRT Terms: Asphalt; Atoms; Bituminous materials; Curves (Geometry); Dislocation (Geology); Entropy (Communications); Equations; Flow; Functions (Mathematics); Manufacturing; Molecules; Motion; Pendulum tests; Shear rate; Shear stress; Sine curves; Temperature; Viscometers
• Uncontrolled Terms: Absolute rate theory; Shear forces; Sources
• Old TRIS Terms: Hyperbolas; Sine function
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00210794
• Record Type: Publication
• Files: TRIS
• Created Date: May 13 1994 12:00AM