Forensic investigation of the cause(s) of slippery ultra-thin bonded wearing course of an asphalt pavement: influence of aggregate mineralogical compositions

The cause(s) of slippery ultra-thin bonded wearing course (UTBWC) of an asphalt pavement was investigated. Petrographic analysis showed that the aggregate used in the UTBWC is mainly limestone with an average acid-insoluble residue of 5.1%. Coefficient of friction tests were performed both on a comparative UTBWC from Virginia with a different aggregate mineralogy (VA-UTBWC) and on slabs extracted from the slippery UTBWC pavement overlay. The tests clearly showed that the slippery UTBWC overlay sharply declined throughout the polishing process, consistent with the aggregate mineralogical composition and its low amount of acid-insoluble residue. In contrast, the comparative VA-UTBWC mix showed a gradual increase and then decrease in friction with continued polishing. This investigation clearly showed that the cause of the slippery asphalt pavement problem of the road is mainly attributed to limestone aggregate polishing.

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    • This material is published by permission of the Turner Fairbank Highway Research Centre, Federal Highway Administration, under Contract No. DTEH61-13-D-00007. The US Government retains for itself, and others acting on its behalf, a paid-up, non-exclusive, and irrevocable worldwide license in said article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the Government. Abstract reprinted with permission of Taylor & Francis.
  • Authors:
    • Beyene, Mengesha A
    • Meininger, Richard C
    • Gibson, Nelson H
    • Munoz, Jose F
    • Youtcheff, Jack
  • Publication Date: 2016-11

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  • English

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  • Accession Number: 01600127
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 12 2016 3:01PM