MECHANICAL BEHAVIOR OF ASPHALT-MINERAL POWDER COMPOSITES AND ASPHALT-MINERAL INTERACTION

THE EXTENT AND NATURE OF THE INTERFACIAL INTERACTION BETWEEN MINERAL AGGREGATE AND BITUMEN WAS STUDIED. AN INDIRECT APPROACH WAS TAKEN BY CHOOSING A SYSTEM WHEREIN A VARYING AMOUNT OF SURFACE AREA COULD BE GENERATED. SEVERAL WELL-DEFINED MINERAL POWDERS OF DIFFERING SIZE WERE ADDED TO TWO DIFFERENT BITUMENS. THE STRESS-STRAIN BEHAVIOR OF THESE COMPOSITES WAS THEN DETERMINED AND COMPARED FOR EVIDENCE OF INTERFACIAL INTERACTION. THE POWDERS WERE MIXED WITH TWO DIFFERENT ASPHALT CEMENTS (AC-20 GRADE) USING A SPECIALLY DESIGNED VACUUM MIXING APPARATUS. THE VACUUM MIXING WAS NECESSARY TO ACHIEVE AN HOMOGENOUS, AIR-FREE MIXTURE. TO DETERMINE THE STRESS-STRAIN RELATION FOR VARIOUS COMPOSITES AND UNFILLED ASPHALTS, THE SAMPLE TO BE TESTED WAS MOUNTED AS A PAIR OF THIN DISKS SANDWICHED BETWEEN THREE STEEL PLATES. A DYNAMIC OR STATIC SHEAR STRESS WAS THEN IMPARTED TO THE SAMPLE BY SHEARING THE CENTER PLATE WITH RESPECT TO THE TWO OUTER PLATES. TESTS WERE PERFORMED AT 5, 15, AND 25 C AND AT FREQUENCIES FROM 0.053 TO 50.3 HZ AND UP TO 120 SECONDS IN CREEP. THE TESTING WAS LIMITED TO LINEAR BEHAVIOR. LINEAR VISCOELASTIC BEHAVIOR WAS VERIFIED IN THE DYNAMIC MEASUREMENTS BY THE INDEPENDENCE OF COMPLIANCE ON STRESS LEVEL AND BY THE SINUSOIDAL RESPONSE TO A SINUSOIDAL INPUT. NO THIXOTROPIC EFFECT WAS NOTICED: STEADY STATE RESPONSE (DYNAMIC) WAS ATTAINED AFTER ONLY A FEW CYCLES. LINEAR VISCOELASTIC BEHAVIOR IN CREEP WAS VERIFIED BY THE INDEPENDENCE OF COMPLIANCE ON STRESS LEVEL AND BY THE ADDITIVITY OF STRESS HISTORY. WITH THE ESTABLISHED LINEAR VISCOELASTIC CHARACTERISTIC USED AS A MEDIUM OF COMPARISON, THE MINERALS WERE FOUND TO INTERACT WITH THE ASPHALT IN A DEGREE VARYING WITH POWDER SIZE AND TYPE AND THE ASPHALT TYPE. /AUTHOR/

  • Supplemental Notes:
    • No 5, 284 PP, 106 FIG, 21 TAB, 80 REF, 9 APP
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  USA  47907-1284
  • Authors:
    • Anderson, D A
  • Publication Date: 1971-2

Subject/Index Terms

Filing Info

  • Accession Number: 00211687
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 8 1971 12:00AM