United States Department of Transportation
i
Alternative aggregates and materials for high friction surface treatments.
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2016-05-01
[PDF-9.79 MB]
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Abstract:The State of Florida has used high friction surface treatments (HFSTs) since 2006 to reduce wet weather crashes on
tight curves and intersections and to maintain bridge decks; however, the Florida Department of Transportation
(FDOT) has reported issues related to premature failure of the treatment. The scope of this project was to:
(1) Review the literature and interview industry experts on the state of the practice of HFST; (2) Document all
existing HFST projects in Florida and analyze their performance based on distress, skid resistance, and crash
reduction; (3) Perform field testing on six projects, evaluating their present performance and conducting forensic
analyses as needed; (4) Perform laboratory tests on different aspects of HFST materials and construction practices to
improve durability and reduce costs; and (5) Develop a revised HFST specification for Florida and an HFST
Guidelines booklet.
The research findings include historic costs, project performance histories, identification of failure mechanisms,
crash rate reductions for various applications, benefit-cost analyses, trends between aggregate loss and both resin
binder type and mil thickness, thermal compatibility measurements, resin binder gel times under non-ideal
situations, an HMA design using calcined bauxite, and comparisons of a few high friction aggregates.
The researchers recommended many ways to improve the design, construction, and quality control of HFST. These
are reflected in the proposed specification Section 333. A new user-friendly booklet, titled “High Friction Surface
Treatment Guidelines: Project Selection, Materials, and Construction,” was created to assist contractors and FDOT
inspectors to implement the new specification.
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