LABORATORY AND FIELD STUDIES ON THE SKID RESISTANCE OF SCREENINGS FOR SEAL COATS

THE MAINTENANCE OF A SKID RESISTANT SURFACE IS A VERY IMPORTANT FACTOR IN THE SERVICE PERFORMANCE OF A HIGHWAY. ALL TYPES OF PAVEMENTS WILL SHOW A REDUCTION IN COEFFICIENT OF FRICTION VALUES DURING SERVICE LIFE. THIS REDUCTION IS CAUSED BY WEAR AND POLISH OF TRAFFIC. ONE OF THE PRIMARY PURPOSES OF A SCREENING SEAL COAT IS TO IMPROVE THE SKID RESISTANCE CHARACTERISTICS OF AN EXISTING ASPHALT CONCRETE PAVEMENT. IT IS IMPORTANT THAT SUITABLE TESTS BE DEVELOPED THAT WILL PROVIDE SCREENINGS HAVING A HIGH ORIGINAL FRICTION VALUE, AND A HIGH DEGREE OF RESISTANCE TO REDUCTION IN THE FRICTION FACTOR BY WEAR AND POLISH OF TRAFFIC. A SATISFACTORY METHOD HAS BEEN DEVELOPED FOR PRODUCING SCREENING TEST PLATES FOR DETERMINING THE ORIGINAL COEFFICIENT OF FRICTION. FRICTION VALUES FROM THESE PLATES CORRELATE VERY WELL WITH FIELD TEST PATCHES SHORTLY AFTER AFTER PLACING. A SIMPLE QUANTITATIVE TEST METHOD HAS BEEN DEVELOPED FOR MEASURING THE ANGULARITY AND SURFACE ROUGHNESS OF SCREENINGS, (THE KS FACTOR). THIS RESULT CORRELATES VERY WELL WITH THE ORIGINAL FRICTION VALUE OF THE SCREENINGS, AND MAY BE USED FOR SPECIFICATION REQUIREMENTS. A LABORATORY METHOD FOR WEAR AND POLISH STUDIES HAS BEEN DEVELOPED WHICH SHOWS GOOD CORRELATION WITH ACTUAL SERVICE PERFORMANCE OF SCREENINGS. PETROGRAPHIC EXAMINATION OF A SCREENING SOURCE WILL NOT PROVIDE SUFFICIENT INFORMATION FOR CHARACTERIZING SCREENINGS IN TERMS OF REDUCTION IN FRICTION VALUE BY WEAR AND POLISH OF TRAFFIC. /AUTHOR/

• Supplemental Notes:
  • No M&r 32126, PP 1-23, 8 FIG, 4 TAB, 11 REF
• Corporate Authors:

  California Division of Highways

  Bridge Department
  Sacramento, CA  United States  05914
• Authors:
  • Skog, J
• Publication Date: 1967-5

Subject/Index Terms

• TRT Terms: Asphalt concrete; Bituminous pavements; Correlation analysis; Field studies; Friction; Geological surveying; Laboratory studies; Pavement maintenance; Pavement performance; Pavements; Petrography; Screenings; Seal coats; Serviceability; Skid resistance; Test procedures; Testing; Texture; Traffic
• Old TRIS Terms: Highway pavement; Petrographic investigations
• Subject Areas: Data and Information Technology; Design; Geotechnology; Highways; Materials; Operations and Traffic Management; Pavements;

Filing Info

• Accession Number: 00206737
• Record Type: Publication
• Files: TRIS
• Created Date: May 13 1994 12:00AM