This paper describes a research project conducted by the Norwegian Public Roads Administration on winter road maintenance and different sanding and salting methods. The first prototype truck based on the warm wetted sand principle consisted of a reconstructed truck spreader with a dropside body. A water tank and heater were mounted on the lorry body. Tests led to the further development of a spreader with a spinner. The warm wetted sand method is described. The most significant factors in the method were the quality of the sand, amount of water, the spreading speed and the water temperature. Two different friction measuring devices were used to determine the friction before and after sanding in 2000/2001. During 2003/2004, a new method was developed, based on adding hot water to salt. Tests were conducted to determine if this could be an alternative to the traditional way of wetting salt by adding salt solution. There was no significant difference between the two methods in the amount of salt in the roadway.
Samenvatting