SKID TESTER CORRELATION STUDY

A CORRELATION STUDY WAS CONDUCTED BETWEEN THE CALIFORNIA SKID TESTER AND AN ASTM SKID TESTER. 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 MILES PER HOUR. SKID NUMBERS WERE OBTAINED WITH THE ASTM SKID TRAILER OPERATING AT ASTM E274-65T STANDARD TEST CONDITIONS OF LOCKED WHEEL, RIBBED TIRE, WET PAVEMENT AND A SPEED OF 40 MILES PER HOUR. THE ASTM UNIT MADE ADDITIONAL TESTS WITH THE SPEED PARAMETER CHANGED TO 50 MILES PER HOUR. TESTS WERE ALSO MADE BY THE ASTM UNIT WITH THE RIBBED TIRE REPLACED BY A SMOOTH TIRE AT SPEEDS OF 40 AND 50 MILES PER HOUR. FOR THE FOUR TEST CONDITIONS INVESTIGATED, CORRELATIONS WERE OBTAINED THAT INDICATE THAT THE CALIFORNIA COEFFICIENT OF FRICTION CAN BE USED TO ESTIMATE THE ASTM SKID NUMBER. A CORRELATION STUDY WAS ALSO CONDUCTED BETWEEN TWO MAKES OF ASTM SKID TESTERS. THE CORRELATION WAS OBTAINED AT THE STANDARD ASTM TEST CONDITIONS. CORRELATIONS WERE ALSO OBTAINED FOR SKID NUMBER CONVERSIONS FOR 20, 30, 50 AND 60 MILES PER HOUR TO THE STANDARD ASTM TEST METHOD SPEED OF 40 MILES PER HOUR FOR EACH ASTM TYPE SKID TEST UNIT. AN ANALYSIS OF VARIANCE WAS CONDUCTED TO DETERMINE THE POSSIBLE SOURCES OF ERROR IN THIS TYPE OF TESTING. /FHWA/

  • Supplemental Notes:
    • B-3-1
  • Corporate Authors:

    California Division of Highways

    Materials and Research Department
    Sacramento, CA  United States  95819

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Sherman, G B
    • JOHNSON, M H
    • Mann, G W
    • Svetich, R R
  • Publication Date: 1971-10

Media Info

  • Pagination: 43 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00206479
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Files: TRIS, USDOT
  • Created Date: Jun 28 1972 12:00AM