MACRO-TEXTURE, FRICTION...MEASUREMENTS ON 41 TYPICAL TEXAS HIGHWAY PAVEMENTS

FRICTION TESTS OBTAINED AT 20, 40, AND 60 MPH WITH THE TEXAS HIGHWAY DEPARTMENT RESEARCH SKID TRAILER, AND MACRO-TEXTURE TESTS UTILIZING FOUR DIFFERENT METHODS WERE CONDUCTED ON FORTY-ONE PAVEMENT SURFACES. THESE SURFACES EXHIBITED WIDELY DIFFERENT FRICTION LEVELS, FRICTION-SPEED GRADIENTS, DRAINAGE CAPABILITIES, MINERALOGICAL PROPERTIES, AND TEXTURE CLASSIFICATIONS. MACRO-TEXTURE VALUES OBTAINED WITH THE FOUR METHODS ARE COMPARED. THE EFFECTS OF MACRO- TEXTURE TYPES AND MAGNITUDES ON FRICTION NUMBERS AND FRICTION-SPEED GRADIENTS ARE ANALYZED. STATISTICAL ANALYSES AND TYPICAL PLOTS ARE GIVEN. BRIEF DESCRIPTIONS OF SEVERAL MACRO-TEXTURE MEASUREMENT METHODS WHICH HAVE OR ARE BEING USED BY VARIOUS AGENCIES IN THE U. S. AND OTHER COUNTRIES ARE PRESENTED. FOR THE TREADED TIRE AND 0.020-INCH WATER FILM THICKNESSES USED, TEXTURE WAS FOUND TO HAVE LITTLE EFFECT ON FRICTION LEVEL, BUT DID APPRECIABLY INFLUENCE THE PERCENT DECREASE IN FRICTION WITH SPEED. PAVEMENT CROSS SLOPE AND WHEEL TRACK DEPRESSION MEASUREMENTS WERE TAKEN. CROSS SLOPE VALUES ARE COMPARED WITH RECOMMENDED AASHO GUIDELINES. ON THE AVERAGE, CROSS SLOPES ON THE TEXAS PAVEMENTS INCLUDED WERE FOUND TO BE FLATTER THAN THOSE RECOMMENDED BY AASHO. /AUTHOR/

  • Corporate Authors:

    Texas Transportation Institute

    Texas A&M University System, 1600 E Lamar Boulevard
    Arlington, TX  USA  76011

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590

    Texas State Department of Highways & Public Transp

    11th and Brazos Streets
    Austin, TX  USA  78701
  • Authors:
    • Galloway, B
    • ROSE, J G
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00206462
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Study No 138-2
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Jan 31 1972 12:00AM