PAVEMENT TEXTURE MEASUREMENT FROM A MOVING VEHICLE-REPORT NO 19

THE COEFFICIENT OF LOCKED-WHEEL FRICTION FOR A WET PAVEMENT DEPENDS ON THE GEOMETRICAL CHARACTERISTICS (TEXTURE) OF THE ROAD SURFACE. DRAINAGE DEPTH AND MEAN VOID WIDTH WERE SELECTED AS THE BEST GEOMETRICAL CHARACTERISTICS FOR MEASURING PAVEMENT TEXTURE FROM A MOVING VEHICLE. TWO DEVICES FOR THE MEASUREMENT OF DRAINAGE DEPTH AND MEAN VOID WIDTH, THE LIGHT STYLUS AND THE ZERO/SLOPE DETECTOR RESPECTIVELY, WERE THEN DEVELOPED IN THE LABORATORY. MEASUREMENETS WERE MADE ON PAVEMENT SPECIMENS CONSISTING OF VARIOUS AGGREGATES, TO EVALUATE THE TWO DEVICES. FINALLY, SEVERAL TECHNIQUES, BOTH MANUAL AND COMPUTERIZED, FOR EVALUATING MEASURED DATA ARE PRESENTED. BOTH DEVICES PERFORMED SUCCESSFULLY IN THE LABORATORY. ALTHOUGH NO ATTEMPT WAS MADE TO TEST EITHER DEVICE ON ACTUAL ROAD SURFACES, IT WAS SHOWN THAT TRANSFERRAL OF THESE DEVICES FROM THE LABORATORY TO A MOVING TEST VEHICLE COULD BE MADE WITH A REASONABLE EXPECTATION OF SUCCESS. /AUTHOR/

• Corporate Authors:

  Pennsylvania State University, University Park

  Pennsylvania Transportation Institute, Transportation Research Building
  University Park, PA  United States  16802

  Pennsylvania Department of Transportation

  1215 Transportation and Safety Building
  Harrisburg, PA  United States  17120

  Bureau of Public Roads /US

  400 7th Street, SW
  Washington, DC  United States  20590
• Authors:
  • Goodman, H A
• Publication Date: 0

Subject/Index Terms

• TRT Terms: Depth; Drainage; Measurement; Moisture content; Motion; Motor vehicles; Pavements; Slipperiness; Surface course (Pavements); Texture; Void ratios; Width
• Uncontrolled Terms: Moving vehicles; Wet conditions
• Old TRIS Terms: Void
• Subject Areas: Highways; Hydraulics and Hydrology; Pavements;

Filing Info

• Accession Number: 00206417
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS, STATEDOT
• Created Date: Sep 28 1970 12:00AM