United States Department of Transportation
i
Performance of Ultra-Thin Bonded Wearing Course (UTBWC) During Winter Snow Ice Events in Maryland
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2023-06-30
[PDF-3.80 MB]
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Edition:SPR-B Final Report (June 2022-August 2023)
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Abstract:Ultra-Thin Bonded Wearing Course (UTBWC) pavement surfacing was developed as a preventative maintenance option to extend pavement life. Despite the successful applications of UTBWC in various states, feedback from winter maintenance crews indicates icing accumulation on some UTBWC surfaces in Maryland during winter storms, and thus current salting practices may need to be revisited. Similar concerns have been identified by other states, and thus safety benefits under snow and ice conditions recently have been in question. However, other non-UTBWC locations seem to have no issues. The scope of this study was to investigate how prevalent the problem is in Maryland, to assess the performance of UTBWC surfaces, and whether any issue is dependent on specific weather and/or winter treatment maintenance. Objectives of this research were thus to: (i) determine how prevalent the problem is in Maryland; (ii) assess the performance difference of UTBWC surfaces compared to non-UTBWC surfaces as reported by SHA Districts; (iii) determine whether any issue is dependent on precipitation type, rate of fall or volume; (iv) examine whether volume of salt or other treatment affects performance, and, (iv) provide potential recommendations for improving their performance.
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