SKID RESISTANCE MEASUREMENTS OF VIRGINIA PAVEMENTS, WITH DISCUSSION AND CLOSURE

MORE THAN 1000 MEASUREMENTS OF FORWARD SKIDDING DISTANCES ON 32 PAVEMENT SURFACES BOTH IN A DRY AND IN A WET CONDITION ARE REPORTED. THE PURPOSE OF THE STUDY WAS TO OBTAIN DATA ON SURFACE CHARACTERISTICS THAT COULD BE USED AS A GUIDE FOR ESTABLISHING FUTURE DESIGN, CONSTRUCTION, AND MAINTENANCE POLICIES. BOTH GOOD AND WORN TREAD SYNTHETIC AND NATURAL RUBBER TIRES WERE EMPLOYED. SKID RESISTANCE MEASUREMENTS WERE MADE BY THE STOPPING DISTANCE METHOD. A LIGHT-WEIGHT AUTOMOBILE EQUIPPED WITH 6.00 BY 16 IN. 4-PLY TIRES WAS USED THROUGHOUT THE STUDY. THE TEST CAR WAS A FREE-MOVING VEHICLE AND NOT INFLUENCED BY THE SAME FORCES AS A TOWED VEHICLE. TESTS WERE CONDUCTED PRINCIPALLY ON HIGH-TYPE PAVEMENTS ON PRIMARY ROADS, INCLUDING BITUMINOUS CONCRETE, SAND ASPHALT, SPECIAL PLANT-MIX, ROCK ASPHALT, SAND AND SLAG SEAL TREATMENTS, BROOM DRAG TREATMENT, PORTLAND CEMENT CONCRETE, AND GLAZED BITUMINOUS SURFACES. TEST SECTIONS WERE SELECTED TO PERMIT AN EVALUATION OF DIFFERENT KINDS OF MATERIALS AND METHODS OF FINISHING. FORWARD SKIDDING DISTANCES INCREASED WITH SPEED AND WERE MUCH LONGER ON WET THAN ON DRY SURFACES. AT 40 MPH, MEASUREMENTS RANGED FROM 63.6 TO 88.9 FT. ON DRY AND 72.0 TO 254.5 FT. ON WET SURFACES. THE DATA INDICATED THAT AT THIS MAXIMUM SPEED (40 MPH) FORWARD STOPPING DISTANCES ARE CRITICAL ONLY ON THE WET PAVEMENTS. IT WAS CONSIDERED UNSAFE TO CONDUCT TESTS ON A WET SURFACE AT GREATER SPEEDS. TWENTY-SEVEN OF THE 32 SURFACES WERE FOUND TO HAVE SATISFACTORY NON-SKID CHARACTERISTICS IN A WET CONDITION. THOSE SURFACES HAVING A ROUGH TEXTURE WERE FOUND TO HAVE SHORT STOPPING DISTANCES AND CORRESPONDINGLY HIGH COEFFICIENTS OF FRICTION. NON-SKID TREATMENTS WERE EFFECTIVE IN REDUCING FORWARD SKIDDING DISTANCES ON WET SURFACES. THE STOPPING DISTANCE METHOD WAS FOUND TO BE A RELATIVELY SIMPLE, INEXPENSIVE, QUICK MEANS OF MEASURING SKID RESISTANCE OF PAVEMENT SURFACES. CLOSE CHECK RESULTS WERE OBTAINED. /AUTHOR/

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  • Accession Number: 00207401
  • Record Type: Publication
  • Report/Paper Numbers: No. 4B-1948 Supplmnt
  • Files: TRIS, TRB
  • Created Date: May 22 1972 12:00AM