Unpaved Road Chemical Treatments: State of the Practice Survey

This report documents survey results regarding the state of the practice of using chemical treatments on unpaved roads. It provides insights into road manager choices and challenges and is useful supplementary reading to the accompanying Unpaved Road Dust Management, A Successful Practitioner's Handbook by Jones et al. (2013).

Roughly 80% of the survey respondents used chemical treatments for six or more years. Ninety eight percent (98%) of those indicated it was to control (fugitive road) dust, in part, to comply with federal regulations, for human and livestock health, in response to public complaints, or as a courtesy to the public. Other top reasons were to reduce maintenance costs and extend grader maintenance intervals.

The most common treatment method was spray-on surface application with the top three chemical treatments being magnesium chloride, calcium chloride, and lignin sulfonate, respectively.