PAVEMENT SURFACE CHARACTERISTICS AND THEIR CORRELATION WITH SKID RESISTANCE

THIS REPORT, A GRADUATE THESIS, PRESENTS THE RESULTS OF A STUDY DESIGNED TO /1/ EVALUATE EXISTING AND DEVELOP NEW METHODS OF MEASURING THE MICROGEOMETRIC CHARACTERISTICS OF PAVEMENT SURFACES AND /2/ DETERMINE IF SUCH MEASURED CHARACTERISTICS OR COMBINATIONS THEREOF CORRELATE WITH THE SKID PROPERTIES OF THE PAVEMENT SURFACES. THE REPORT CONTAINS /1/ DISCUSSION OF THE MECHANISM OF FRICTION BETWEEN A SLIDING TIRE AND THE ROAD SURFACE, /2/ DESCRIPTION OF VARIOUS GEOMETRIC CHARACTERISTICS OF THE ROAD SURFACE, /3/ DESCRIPTION OF INSTRUMENTATION USED TO OBTAIN DETAILED MICROPROFILES OF THE ROAD SURFACE, /4/ DISCUSSION OF METHODS AND TECHNIQUES USED TO MEASURE SEVEN OF THE SURFACE CHARACTERISTICS JUDGED FROM EXPERIENCE TO BE MOST LIKELY TO CORRELATE WITH ROAD-TIRE FRICTION AND /5/ CORRELATIONS BETWEEN THE SELECTED SURFACE CHARACTERISTICS AND SKID RESISTANCE. FIVE OF THE ABOVE-MENTIONED SEVEN SURFACE CHARACTERISTICS-DRAINAGE AREA, MEAN ASPERITY HEIGHT, SHAPE FACTOR, MEAN VOID WIDTH AND MEAN HYDRAULIC RADIUS-WERE CHOSEN FOR POSSIBLE CORRELATION WITH THE GRADIENT OF THE FRICTION COEFFICIENT-SPEED RELATIONSHIP. THE OTHER TWO CHARACTERISTICS, HIGH PRESSURE PEAK DENSITY AND ACTUAL CONTACT AREA, WERE CHOSEN FOR POSSIBLE CORRELATION WITH THE MAGNITUDE OF THE LOW-SPEED COEFFICIENT OF FRICTION. FROM THE RESULTS OF THE STUDY, THE AUTHOR CONCLUDES THAT' 1. SURFACE CHARACTERISTICS THAT ARE RELATED TO THE SIZE OF THE CHANNELS THROUGH WHICH WATER CAN ESCAPE FROM THE TIRE CONTACT AREA CORRELATE WITH THE GRADIENT OF THE FRICTION COEFFICIENT-SPEED RELATIONSHIP. 2. SURFACE CHARACTERISTICS THAT ARE RELATED TO THE PENETRATION OF THE ASPERITY PEAKS INTO THE TREAD RUBBER CORRELATE WITH THE ABSOLUTE VALUE OF THE COEFFICIENT OF FRICTION. 3. PERFECT CORRELATIONS CANNOT BE OBTAINED SINCE A SINGLE SURFACE CHARACTERISTIC CANNOT COMPLETELY DESCRIBE THE NATURE OF THE CONTACT BETWEEN THE TIRE AND THE PAVEMENT. 4. THE MEASUREMENTS MADE ON THE SELECTED SURFACE CHARACTERISTICS LEAVE SOMETHING TO BE DESIRED WHEN CONSIDERED IN THE LIGHT OF STATISTICAL ADEQUACY AND RIGOROUS PROOF. /BPR/

  • Supplemental Notes:
    • Hps-hpr-1/23/, STATE 371, BPR NO 10
  • Corporate Authors:

    Pennsylvania State University, University Park

    Pennsylvania Transportation Institute, Transportation Research Building
    University Park, PA  United States  16802
  • Authors:
    • Gillespie, T D
  • Publication Date: 1964-6

Subject/Index Terms

Filing Info

  • Accession Number: 00206260
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 1 1994 12:00AM