Chapter 2: Materials
Section 1: Overview
Summary
A variety of factors should be taken into account when deciding
upon a course of action to treat roadways during a winter storm
event. Product application combinations are chosen after maintenance
personnel have evaluated many factors including, but not limited
to:
- air temperature
- pavement temperature
- humidity levels
- dew point temperatures
- cloud cover vs. sunshine
- type and rate of precipitation
- weather forecast
- weather radar data
- traffic conditions (volume, route, etc.).
Operational treatments are continuously evaluated before,
during and after a winter storm. Road treatment and applications
are modified through all phases of a storm based on careful analysis
of intensity, duration and type of precipitation.
Whereas anti-icing operations are conducted to prevent the
formation or development of bonded snow and ice for easy removal,
de-icing operations are performed to break the bond of already bonded
snow and ice. The AASHTO Winter Roadway Maintenance Computer-Based
Training provides comprehensive training in all aspects of winter
roadway maintenance. Each district has a copy. Check with your Director
of Maintenance or Operations to locate your district's copy. It
is important for maintenance personnel to understand the uses and
limitations of each of the materials and techniques explained in
this chapter.