THE EFFECT OF THE MATRIX ON AGGREGATE RETENTION AND SURFACE WEAR CHARACTERISTICS OF BITUMINOUS SURFACES

RESULTS ARE PRESENTED OF PHASE I WHICH INVOLVED THE TESTING OF FOUR BASIC MIXES USED IN PENNSYLVANIA. THE BITUMINOUS MIXTURES TESTED WERE OF THE ID-2 TYPE AS FOLLOWS: MIX 1 LIMESTONE COARSE AND FINE AGGREGATE, MIX 2 - TRAPROCK COARSE AND FINE AGGREGATE, MIX 3-CRUSHED GRAVEL, COARSE AGGREGATE AND NATURAL SAND FINE AGGREGATE, AND MIX 4-BAKED SHALE, COARSE AND FINE AGGREGATE BLENDED WITH NATURAL SAND. IN ADDITION TO THE AGGREGATES USED, MIXTURES WERE EVALUATED USING VARIOUS FILLERS AS ADDITIVES. THE BITUMEN USED WAS EITHER 70-85 OR 85-100 PENETRATION. A 50-60 GRADE PENETRATION ASPHALT WAS INCLUDED IN MIXES 1 AND 3, AND A ROAD TAR WAS EVALUATED IN MIX 2.THE FOUR MIXES WERE TESTED BY APPLYING WHEEL LOADINGS WITH A SIMULATED TRAFFIC WEAR APPARATUS. THE WEAR APPARATUS CONSISTED OF TWO DIAMETRICALLY OPPOSITE WHEELS DRIVEN BY TWO ELECTRIC MOTORS. THE WEAR APPARATUS WAS DESIGNED TO APPLY 107,000 WHEEL LOADINGS OF 1100 LB. EACH IN A 24 HOUR PERIOD. TESTS WERE CONDUCTED AT VARIOUS INTERVALS OF LOADING TO DETERMINE: (1) THE SKID RESISTANCE, (2) CHANGE IN SURFACE PROFILE, (3) WEIGHT LOSS, (4) CHANGE IN SURFACE CHARACTERISTICS AND, (5) SUBSURFACE DEFORMATION. DIFFERENCES IN SKID RESISTANCE WERE OBTAINED AND CONFIRMED BY SURFACE TEXTURE EVALUATION. AN ABRASIVE AGENT USED IN PART OF THE STUDY RESULTED IN INCREASED SAMPLE WEAR AND A REDUCTION IN SKID RESISTANCE. STIMULATION OF LOSS OF FINES FROM THE SURFACE WAS NOT SUCCESSFUL. /AUTHOR/

  • Supplemental Notes:
    • Hpr-1(4), BPR 12, STATE 077
  • Corporate Authors:

    Villanova University

    ,    

    Pennsylvania Department of Highways

    400 North Street
    Harrisburg, PA  USA  17120-0095

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  USA  20590
  • Publication Date: 1968-7

Subject/Index Terms

Filing Info

  • Accession Number: 00210398
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Nov 12 1994 12:00AM