United States Department of Transportation
[PDF-32.39 MB]
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Edition:Year 3 Final Report
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Abstract:During the 2020 construction season, the Alaska DOT&PF Central Region installed its first application of micro surfacing at 17 locations on Minnesota Drive ramps in the city of Anchorage. This treatment offers the potential to be a more economical solution to the typical mill and fill hot mix asphalt (HMA) treatment used to address rutted roads. Micro surfacing has not been used on roads in Central Region due to poor historical Prall testing (ATM 420) that is used to simulate studded tire wear. A new formulation of micro surfacing was evaluated in 2016 with significantly improved performance on the Prall test. This formulation uses fine aggregate and a high residual binder content with a PG64-40 modified asphalt binder and between 6%-8% SBS polymer. This is a very high percentages of both binder and polymer for a micro surfacing treatment. There were difficulties encountered during construction with break and set times that made the micro surfacing prone to flushing and deformation rutting immediately after construction. Five ramps were removed and replaced during construction from these distresses. The remaining ramps range from good to poor conditions and the condition at the end of the three years of monitoring largely depends on the original ramp conditions. Ramps that had high severity cracks, or frost movement during the winter experienced snowplow damage, while ramps that were in good condition largely remain in good condition.
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