FRICTION CHARACTERISTICS OF PAVING MATERIALS IN CONNECTICUT, REPORT 2

Seasonal variation in friction was again observed as in previous years on heavily traveled blacktop roads but has not been seen on Portland Cement Concrete. It corresponds to the development of a dark and greasy appearance on the surface in mid-to-late summer and is most pronounced where truck traffic is heavy. Comparisons of burlap-drag and transverse-broomed textures on PCC indicate that skid numbers on transverse brooming trend to remain outside of the wheel paths. An analysis of cores removed from several of the test sites was attempted; cleaning of the surface was done, and skid numbers obtained by means of the British Pendulum Tester. The experiments were unsuccessful. A section of pavement placed with an open-graded friction course was included in the 1973 test schedule and was found to maintain a constant and fairly high number throughout the summer. No relationship between skid number and asphalt content over a range of 5 - 7 percent could be found on blacktop pavements. Tests made on pavements using a mixture of aggregate types suggest that reduced loss of friction may result from the use of this technique. /FHWA/

  • Supplemental Notes:
    • Research sponsored by Connecticut Department of Transportation in cooperation with FHWA.
  • Corporate Authors:

    Connecticut Department of Transportation

    Bureau of Planning and Research, 24 Wolcott Hill Road
    Wethersfield, CT  USA  06109
  • Publication Date: 1974-8

Media Info

  • Pagination: 68 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00083582
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Apr 8 1975 12:00AM