Varmsandning på gång- och cykelvägar: Utvärdering i Umeå av för- och nackdelar med metoden

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Considering the safety of cyclists and pedestrians the winter maintenance service level needs to be improved and there is a need for skid control measures that are effective and, at the same time, reduce the amount of grit spread during the wintertime. Warm wetted sand, a method were the sanding material is mixed with hot water while spreading and were the sand adheres to a cold surface through a process of melting and freezing, could be the solution. In this study, the applicability of using warm wetted sand on walkways and bike paths has been evaluated in Umeå municipality during the winters of 2010/11 and 2011/12. Comparing measurements of friction clearly showed higher levels of friction improvements and with a longer duration when using warm wetted sand for skid control on walkways and bike paths compared to traditional dry sand. The study also showed that the number of actions can be reduced when using warm wetted sand instead of traditional dry, and it is therefore possible to reduce the amount of grit spread. The method was most effective on sections with on-street-cycling were the road condition more often is thick ice. The apprehension that the method might create an uneven surface uncomfortable for cyclists was not perceived. The maintenance operators had, on the other hand, noticed that when spreading warm wetted sand on soft packed snow an uneven surface might occur, if the warm sand melts through the top layer of the snow surface. The main problem with the method is the freezing of the sand material in the hopper and the spreader, due to the high amount of fine graded particles in the sand mixture. The results are not promising enough to motivate an investment in equipment for skid control on walkways and bike paths only, but with a multi-purpose use it gets more cost effective.

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