Annotated Literature Review for NCHRP Report 640 (2009)

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269 1.72 Van Doorn, R. “Winter Maintenance in the Netherlands.” Ministry of Transportation. Public Works and Water Management. Compiled from COST344 Snow and Ice Control on European Roads and Bridges Task Group 3. Best Practices. March 2002. 1.72.1 General This report provides information on the current winter maintenance activities for pavements in the Netherlands. Because of the influence of the North Sea, the climatic conditions of the Netherlands are more tempered than other Scandinavian countries. Extremely high or low temperatures are generally not experienced. Some general statistics for the Netherlands are provided in Table 129. Table 129: General Climatic Statistics for the Netherlands Amount of rain per year 760 mm (30 in.) Number of days below 0˚C per year 60 days Number of days with snowfall per year 30 days Number of days with freezing rain per year 1 day 1.72.2 Benefits of Permeable Asphalt Mixtures No specific benefits were given. 1.72.3 Materials and Mix Design No specifics on materials and mix design were given. 1.72.4 Construction Practices No specifics on construction practices were given. 1.72.5 Maintenance Practices Table 130 presents the recommended average rate for spreading road salt in various winter climatic conditions from the Netherlands. This table suggests that more road salt is required for porous asphalt. Table 130: Recommend Spreading Rates Amount of NaCl (g/m2) Condition dry salt prewetted salt Preventative (before a problem exists) - 7(1) Fog Moisture 10 7 Icing 15-20 7-10 Glazed Frost (2) 20 15 Snow (after removal with plows) (3) 20 - (1) On porous asphalt 14 g/m2 is used (two application of 7 g/m2) (2) When the glazed frost situation stays for several hours, 20-40 g/m2 dry salt should be used. (3) Precautionary treatment: 15-20 g/m2 pre-wetted salt.