United States Department of Transportation
i
Construction and performance of ultra thin asphalt friction course
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1997-09-01
[PDF-1.15 MB]
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Abstract:The Novachip process, also known as ultrathin friction course, was developed in France in 1986. The process utilizes a single piece of equipment to place a thin, gap-graded hot mix asphalt (HMA) onto a relatively thick layer of polymer modified asphalt emulsion tack coat. Two Novachip projects were constructed in Alabama in 1992 to achieve the following objectives: (a) Document the materials and the construction procedures utilized in the construction of the Novachip surface course, and (b) monitor and evaluate the performance of the Novachip test sections at regular intervals for a period of three years. This paper gives the construction details and performance of Novachip after 4 1/2 years in service. The surface texture of Novachip is very similar to that of a typical open-graded friction course. No significant raveling was observed on the two projects after about 4 1/2 years in service, which indicates very good bond between Novachip and underlying surface. Novachip surface has significantly higher pavement surface friction numbers compared to dense-graded HMA wearing course. It appears to be a potential alternate for chip seals, microsurfacing, and open-graded friction course. Photos, figures, tables, references.
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