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DEVELOPMENT OF TEST FOR MEASURING ANGULARITY AND SURFACE ROUGHNESS OF SEAL COAT SCREENINGS

A QUANTITATIVE TEST HAS BEEN DEVELOPED TO MEASURE ANGULARITY AND SURFACE ROUGHNESS OF SCREENINGS USED IN SEAL COATS. THE TEST SAMPLE WAS A WASHED AND DRIED AGGREGATE PASSING A NO. 3 SIEVE AND RETAINED ON A NO. 4 SIEVE. THE SAMPLE WAS SATURATED IN KEROSENE AND CENTRIFUGED. WEIGHT OF THE SAMPLE WAS RECORDED AND THEN THE SAMPLE WAS REMOVED FROM THE CENTRIFUGE CUP AND PLACED IN A C. K. E. TEST FUNNEL. THE FUNNEL WAS SUBMERGED IN LUBRICATING OIL, RAISED IMMEDIATELY AND ALLOWED TO DRAIN. THE DIFFERENCE IN WEIGHTS AFTER CENTRIFUGING AND AFTER DRAINING REPRESENTS A SURFACE FACTOR FOR THE SCREENING SAMPLE. THIS FACTOR, AFTER A SPECIFIED GRAVITY CORRECTION, IS DESIGNATED KS. THE KS VALUE OBTAINED IS RELATED TO THE SKID RESISTANCE OF THE SCREENINGS AND MAY BE USED TO CONTROL COEFFICIENT OF FRICTION VALUES ON ORIGINAL MATERIALS. A TEST PROVIDES A QUANTITATIVE VALUE, AND MAY BE USED IN PLACE OF THE PRESENT METHODS FOR DETERMINING THE PERCENTAGE OF CRUSHED PARTICLES. AN EXCELLENT CORRELATION WAS FOUND BETWEEN THE KS VALUES DETERMINED IN THE TEST AND THE COEFFICIENT OF FRICTION VALUE. THEREFORE, THIS TEST MAY BE USED TO CONTROL THE ORIGINAL SKID RESISTANCE VALUE OF SEAL COAT SCREENINGS.

  • Supplemental Notes:
    • No M & R 34021, 16 PP, 6 FIG, 4 TAB, 1 APP
  • Corporate Authors:

    California Department of Public Works

    1120 N Street
    Sacramento, CA  United States  95814

    California Division of Highways

    Bridge Department
    Sacramento, CA  United States  05914

    California Department of Public Works

    Materials and Research Department
    Sacramento, CA  United States  95814
  • Authors:
    • Nelson, Mark
    • Skog, J
  • Publication Date: 1967-5-1

Subject/Index Terms

Filing Info

  • Accession Number: 00217564
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 20 1994 12:00AM