17-S2: Use of Prewetted Solid Materials for Roadway Anti-icing

Problem
Historically pre-treatment or anti-icing has been accomplished with the use of liquid products such as CaCl, MgCl, or brine. Recently, a transition has been made to higher pre-wet rates for solid applications because many crews seem to believe that this is a more cost effective method than liquid.

Objective
Clear Roads members are interested in learning about state DOT’s experiences with using prewetted solids or slurries for roadway anti-icing as an alternative to traditional liquid anti-icing. Specifically, they’d like answers to the following questions.

  • What is the prevalence of this technique and what are the conditions when this approach may be appropriate?
  • What is the cost/benefit of this approach when compared to traditional liquid applications?
  • Is there an increased environmental impact to this approach? ie. more chloride on the road or more importantly off the road?

Expected Results
Through a literature search and survey of Clear Roads states, this project will produce a synthesis report which summarizes state DOT practices relate to prewetting of solid materials for anti-icing, including a description of which materials are used, what prewet rates and/or slurry rates are used, the most appropriate weather and road conditions for this technique, effects on the environment, regulatory issues, and success stories, challenges, or lessons learned.

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