United States Department of Transportation
i
Ultra-Thin Bonded Wearing Course (UTBWC) Snow, Ice, and Wind Effects: Transportation Research Synthesis
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2018-06-01
[PDF-2.73 MB]
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Abstract:Several MnDOT UTBWC projects and their pavement performance attributes have been studied during the 2000s. However, winter maintenance practices and activities have not been identified as factors on these projects. Some MnDOT District Maintenance forces have recently observed that in-service UTBWC surfaces can increase time demands and/or the amount of deicing materials to achieve a clear and dry pavement surface. These observations are summarized as follows: There have been observations that UTBWC is causing ice build-up in the wheel paths on some sections. The rough (popcorn like) texture of UTBWC surfaces has a tendency to accumulate wind-blown snow. The rough texture and open-graded characteristics of UTBWC surfaces may require additional deicing material compared to conventional HMA surface, thus allowing accumulated snow to melt at the surface and form a bond with the underlying pavement. Once a bond of ice/frozen slush has formed achieving a bare pavement surface requires increased plow time and deicing chemicals necessary as compared to conventional mixes or sealcoated surfaces. Various deicing methods such as prewetting and early application have been tried to address this situation without finding a means to consistently address the phenomenon in all Districts of MnDOT.
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