DEVELOPMENT AND VALIDATION OF A METHOD FOR ESTIMATING ROAD FRICTION AFTER DE-ICING SALT SPREADING CONSIDERING THE INFLUENCE OF VEHICLE PASSAGE

Abstract

 A method of estimating the post-salting road surface skid resistance considering salt scattered by the passage of vehicles on the road ice film (simplified prediction method) was developed in this study. In order to develop this method, a numerical model was developed to calculate the amount of de-icing salt that is scattered beyond the roadway due to the passage of vehicles. And then, the ratio of scattered salt to spread salt was evaluated by simulations based on the numerical model. Moreover, the relation between the road ice film thickness and HFN was clarified by field tests. Additionally, the simplified prediction method was verified through comparison between estimated HFN and measured HFN.
 It became possible to estimate the post-salting HFN for a road ice film considering the influence of vehicle passage.