TEST FOR COEFFICIENTS OF FRICTION BY THE SKIDDING CAR METHOD ON WET AND DRY SURFACES

A SKID RESISTANCE TEST WAS MADE ON VARIOUS PAVEMENTS WITHIN THE STATE OF MISSISSIPPI. TEST RESULTS SHOW THAT THE AGE OF THE ROAD AND THE VOLUME OF TRAFFIC HAVE A DIRECT BEARING ON THE CONDITION OF THE SURFACE, AND ON THE COEFFICIENT OF FRICTION AND STOPPING DISTANCE. A TRAFFIC INDEX WAS SET UP TAKING THESE FACTORS INTO CONSIDERATION. TESTS WERE CONDUCTED ON COLD MIX SURFACES AND HOT MIX PAVEMENTS. ANOTHER CONTRIBUTING FACTOR TOWARDS REDUCTION OF COEFFICIENT OF FRICTION ON SOME PAVEMENTS WAS FOUND TO BE THE ACCUMULATION OF OIL DRIPPINGS. IN THE TESTING OF STOPPING DISTANCES ON SAND ASPHALT PAVEMENTS, IT WAS NOTICED THAT THE VEHICLE SKIDDED STRAIGHT FORWARD. FRICTION VALUE, BOTH IN DRY AND WET TESTS, WAS FOUND TO FOLLOW THE SAME PATTERN, THE HIGHEST VALUES BEING OBTAINED ON THE MORE ANGULAR AGGREGATE. TEST RESULTS ARE PRESENTED IN FIGURES. IT IS CONCLUDED THAT IF GOOD RESISTANCE TO SKIDDING IS TO BE OBTAINED IN A PAVEMENT SURFACE WHEN THE PAVEMENT IS WET, THE COMPOSITION OF THE MIXTURE MUST BE ALL RIGHT AND THE AGGREGATES MUST BE OF THE KIND THAT WILL REMAIN HARSH AND RESIST SEVERE POLISHING UNDER TRAFFIC.

Media Info

  • Monograph Title: Pavement slipperiness factors and their measurement
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00206954
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Oct 14 1994 12:00AM