CORRELATION BETWEEN CALIFORNIA AND BPR SKID TESTERS

A CORRELATION STUDY WAS CONDUCTED BETWEEN THE CALIFORNIA SKID TESTER AND THE U.S. BUREAU OF PUBLIC ROADS SKID TRAILER. SKID RESISTANCE TESTS WERE MADE ON SEVEN TYPES OF PAVEMENT SURFACES, ENCOMPASSING BOTH PCC AND AC, AT ELEVEN LOCTIONS IN THE VICINITY OF SACRAMENTO, CALIFORNIA. COEFFICIENTS OF FRICTION WERE OBTAINED WITH THE CALIFORNIA UNIT AT THE STANDARD TEST CONDITIONS OF LOCKED WHEEL, SMOOTH TIRE, WET PAVEMENT AND A SPEED OF 50 MPH. SKID NUMBERS WERE OBTAINED WITH THE BPR SKID TRAILER OPERATING AT ITS STANDARD TEST CONDITIONS OF LOCKED WHEEL, RIBBED TIRE, WET PAVEMENT AND A SPEED OF 40 MPH. THE BPR UNIT MADE ADDITIONAL TESTS WITH THE SPEED PARAMETER CHANGED TO 50 MPH. TESTS WERE ALSO MADE BY THE BPR UNIT WITH BOTH THE SPEED INCREASED TO 50 MPH AND THE RIBBED TEST TIRE REPLACED BY A SMOOTH TIRE. FOR THE THREE TEST CONDITIONS INVESTIGATED, CORRELATIONS WERE OBTAINED THAT INDICATE THAT THE CALIFORNIA COEFFICIENT OF FRICTION CAN BE USED TO PREDICT THE BUREAU OF PUBLIC ROADS SKID NUMBER. COMPARISON OF RESULTS OF TESTS CONDUCTED AT THE STANDARD CONDITIONS REVEALS THAT THE PRESENT CALIFORNIA TENTATIVE MINIMUM COEFFICIENT OF FRICTION FOR PAVEMENT EVALUATION (.25F) CORRESPONDS QUITE WELL TO THE TENTATIVE MINIMUM SKID NUMBER FOR MAIN RURAL HIGHWAYS (37SN) AS RECOMMENDED IN NCHRP 37. /AUTHOR/

• Corporate Authors:

  California Division of Highways

  Bridge Department
  Sacramento, CA  United States  05914

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Skog, J B
  • JOHNSON, M H
• Publication Date: 1969-7

Subject/Index Terms

• TRT Terms: Coefficient of friction; Correlation analysis; Numbers; Pavements; Skid resistance; Skid resistance tests; Test procedures; Testing equipment
• Old TRIS Terms: Highway pavement
• Subject Areas: Data and Information Technology; Highways; Pavements;

Filing Info

• Accession Number: 00206402
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Report/Paper Numbers: B-3-1
• Files: TRIS, USDOT
• Created Date: May 13 1970 12:00AM