United States Department of Transportation
i
Evaluation of Alternatives to Calcined Bauxite for Use in High Friction Surface Treatment (HFST) in Missouri
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2021-09-01
[PDF-4.14 MB]
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Edition:Final report: November 2019-September 2021
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Abstract:High Friction Surface Treatments (HFST) applications are used to reduce roadway crashes on risky locations and horizontal curves. Currently, Calcined Bauxite (CB) is the primary aggregate used for HFST in Missouri. Calcined Bauxite has very limited sources, which makes it more expensive than locally available aggregates. This research evaluated CB's feasible alternative aggregates through a comprehensive experimental program for use in HFST applications. The alternative aggregates were Earthworks, Meramec River, Steel Slag, Rhyolite, Black Diabase, Quartzite, Flint Chat, and Potosi Dolomite aggregate sources. Three categories of testing were followed in the experimental program: the first category was for the physical properties testing, the second category was for durability testing, and the third category was for performance testing. Two main conclusions related to aggregate sources in HFST applications were noted: the availability of alternative aggregate sources that compare to Calcine Bauxite quality and the applicability of performance testing to evaluate aggregate sources. A Life-Cycle-Cost simple program was developed to conduct cost analysis based on performance of the tested aggregate sources. The study recommended to construct HFST field sections using the selected alternative aggregates.
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