All States Materials Group

Additional Resources

PDF Dust Control Summary


Dust Control

Dust Control with Calcium
and Magnesium Chlorides

The application of calcium or magnesium chloride on unpaved roads ties down and controls dust. All States Materials Group uses well-calibrated, well-maintained equipment to evenly spray the 30% to 35% solution over newly graded road surfaces. Dust control treatment can significantly reduce the amount of particulates emitted into the air. But control of dust is just a small part of the benefits of these treatments. The light application of chemical also provides protection to the road surface, tying down fines and reducing loss of aggregate. Research has shown that untreated gravel roads can lose as much as an inch of aggregate a year, or about 500 tons of material for every mile of untreated road. All States’ calcium and magnesium chlorides bond fines to aggregates and absorb moisture from air and road surfaces. The moisture prevents the surface from becoming dry and dusty. With the fines intact, the bonded gravel stabilizes the road crust into a dense, compacted surface. Improved stabilization increases load bearing capacity, firmness and resistance to potholing and other forms of deterioration. Further, they depress the freezing temperature, resulting in less damage from surface freeze-thaw cycling. Calcium and magnesium chloride are environmentally safe, with only minimal migration of the very low application into soil that don’t adversely affect plant or animal life.

Benefits of Dust Control with Calcium and Magnesium Chlorides

  • Improve road safety and visibility
  • Reduce particulates in the air and their adverse health effects
  • Slow the erosion of aggregates
  • Resist potholing, dusty and muddy conditions
  • Reduce added stone and grading costs
  • Economical treatment for reducing maintenance costs and providing dust-free, well-maintained unpaved road surfaces

The Process

The gravel road must be shaped to desired profile and any drainage problems addressed before treatment. Once the road has been graded, All States Materials Group’s specially designed liquid distributor truck uniformly sprays about 0.33 gallons of 35% CaCl2 or 30% MgCl2 solution per square yard of road. The road surface is then compacted following the treatment. Our experienced crews know how to spot and repair any problem areas, and to satisfy you with a job well done.

When and Where to Apply Calcium and Magnesium Chloride Dust Suppressants

For optimal performance of dust suppressants, the road surface must be mechanically stable. The ideal time for application is spring when the road is graded after the winter’s checking and damage to gravel gradation, road crown and drainage. A second application in the fall will protect the surface for the whole year. The enhanced properties of our dust suppressant solutions translate into a gravel road needing less frequent re-grading and rebuilding, and therefore lower total maintenance costs. You only need minor changes to your gravel road maintenance program to incorporate calcium or magnesium chloride. You will quickly notice the improved riding surface and lack of dust. Calcium and magnesium chlorides can also be used for anti- and de-icing. They add to the effectiveness of, and are less corrosive than salt. Contact us for more information on cost-effective ways of maintaining your low volume roads.