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  In recent years, several tests have been conducted with additives to road salt (such as agricultural bi-products), with one of the purposes being reduction of the amount of salt used for winter maintenance. The Norwegian Public Roads Administration seeks to optimize salt usage in winter maintenance in order to minimize environmental impacts. In this respect there is a need for a better understanding of how road salt additives can reduce usage of road salt. Focus is directed to the extension of the lifetime of salt on road surfaces. This report describes the different mechanisms of salt removal from road surfaces and how salt additives possibly can affect these mechanisms. Following, it describes a case study performed in Norway to document the removal of salt with and without salt additives. Five tests have been performed where the change in salt amount is described by over 1900 salt measurements. An extended lifetime due to salt additives has not been found. In all tests, the lifetime of salt with additive was about the same as the lifetime of salt without additives. On wet road surfaces, where both the salt and the additive were dissolved, the salt loss occurred by the same mechanisms; the spray of water from vehicles and possibly run-off. Under these conditions the additive had no possibilities to increase the lifetime of salt. On dry road surfaces, where the salt had crystallized due to evaporation of water, salt remained on the road surface for a prolonged period of time, both with and without the salt additive. In one case with favourable testing conditions, there were no indications of salt loss after 30 hours, or 20 000 vehicle passages. This long lifetime quickly terminated when rain wetted the pavement. In Norway, winter maintenance personnel appear to share a common opinion that “salt disappears when the road dries up”. This opinion, however, contradicts the measurements performed in this case study. There has been found clear indications that the instrument to measure salt (SOBO20) is unable to detect all salt that is present in crystallized form. This underestimation of salt on dry surfaces may have contributed to the opinion that “salt disappears when the road dries up”.
content link: http://www.vegvesen.no/_attachment/70105/binary/35097
content language: Norwegian
English summary: no
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created: Kjersti Wike, 10.11.2009 15:09:00
last modified: Kjersti Wike, 11.06.2010 14:11:06