VISCOELASTIC PROPERTIES OF ASPHALT CONCRETE

RESEARCH IS UNDER WAY FOR THE PURPOSE OF ESTABLISHING THE USEFULNESS OF VISCOELASTIC ANALYSIS AS APPLIED TO AN UNDERSTANDING OF THE RHEOLOGIC CHARACTERISTICS AND STRUCTURAL RESPONSES OF ASPHALT CONCRETE. AS A PRELIMINARY STEP, THE ASPHALT CONCRETE MIXTURE TO BE USED IN PREPARING THE TEST SLABS WAS SUBJECTED TO AN EXTENSIVE PROGRAM OF TRIAXIAL COMPRESSION TESTING, COVERING A RANGE OF LOAD TYPES INCLUDING CREEP, STRESS RELATION, CONSTANT RATE-OF-STRAIN, AND REPEATED LOAD LATERAL PRESSURES FROM 0 TO 250 PSI AND TEMPERATURES FROM 49 TO 140 F. FROM THE RESULTS OF TRIAXIAL TESTS AT A SPECIFIC TEMPERATURE AND LATERAL PRESSURE, VISCOELASTIC CONSTANTS FOR A FOUR-ELEMENT RHEOLOGIC MODEL WERE DERIVED; VALUES FOR THESE CONSTANTS WERE OBTAINED FOR THE ENTIRE RANGE OF AMBIENT CONDITIONS STUDIES. THIS PHASE OF THE RESEARCH THUS PRODUCED A BASIC SYSTEM OF DATA RELATING THE GENERAL STRESS-STRAIN-TIME CHARACTERISTICS OF THE TEST MIXTURE. A COMPARISON OF THE DEFLECTIONS PREDICTED BY VISCOELASTIC THEORY WITH THOSE MEASURED DURING THE SLAB TESTS INDICATED THAT THE SLAB PROFILES FROM BOTH SOURCES HAD THE SAME GENERAL SHAPE AND TIME DEPENDENCE, BUT THAT THE MEASURED VALUES HAD MAGNITUDES CONSIDERABLY GREATER THAN THOSE GIVEN BY THEORY. THE DEVIATIONS BETWEEN THE TWO SETS OF VALUES INCREASED WITH INCREASED TEMPERATURE. ALSO INCLUDED IS A DISCUSSION OF THE PROBABLE SOURCE OF THE DIFFERENCES FOUND BETWEEN THE SLAB TEST DATA AND THEORETICAL PREDICTIONS /HRB/

• Record URL:
  https://onlinepubs.trb.org/Onlinepubs/HRBproceedings/41/41-020.pdf
• Supplemental Notes:
  • Vol 41, pp 299-320, 16 FIG, 2 TAB, 16 REF. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Secor, K E
  • Monismith, C L
• Publication Date: 1962

Media Info

• Media Type: Digital/other
• Monograph Title: Proceedings of the 41st Annual Meeting of the Highway Research Board, Washington, D.C., January 8-12, 1962
• Serial:
  • Highway Research Board Proceedings
  • Volume: 41
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Accelerated tests; Asphalt concrete; Compression; Creep; Deformation curve; Laboratory tests; Loads; Mathematical models; Mechanical relaxation; Repeated loads; Rheological properties; Slabs; Theory; Time; Triaxial shear tests; Viscoelasticity
• Uncontrolled Terms: Horizontal loads; Triaxial compression
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00211649
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jan 24 1972 12:00AM