To properly select the road dust control method, the soil properties, geometry, traffic levels, and climate conditions must be known.

Treating an un-surfaced road with a suitable dust suppressant decreases the loss of fines. Fines are the “fillers” between larger aggregate particles that hold them together and form a flat surface layer. Therefore, keeping fines on the road surface leads to:

  • reduced dust levels
  • improved air and water quality by reducing particulate matter and sediment runoff
  • improved safety and driving quality
  • extended periods between gravel re-fills
  • extended periods between grader blading processes

Water absorbing dust suppressants act by absorbing small quantities of water from the atmosphere, which agglomerates fines and holds the aggregates together through suction forces. The most common agents in this group are magnesium chloride and calcium chloride. They are water soluble and negligibly contribute to strength improvement. Roads treated with these road dust control agents can be maintained with conventional techniques such as grader blading after a light rain or water application. Magnesium chloride and calcium chloride are very common in road dust control, due to known effect and ready availability. However, there are concerns about negative long-term environmental impacts associated with their applications.

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Organic non-petroleum polymers act as a glue that binds fines and coarser particles together. In this group are lignosulfonates, tree resins, tree oils, vegetable oils and molasses-based products. These are by-products from various processes. Their composition is variable and depends on the process ingredients and type. Most of these natural polymers are water soluble, which make them unsuitable for regions with precipitation. They are effective in road dust control treatments but do not provide a sufficient increase in strength. Treated roads can be maintained with conventional techniques for unsurfaced roads.

There is a constant need for the development of road designs. The reason for that is that trucks are becoming larger and faster and the loads they haul are heavier, resulting in greater pressure to the road. The similar situation is with passenger vehicles. On the other side, a good quality aggregate is becoming scarce and thus harder to obtain and more expensive as it must be hauled over long distances. When it comes to dust suppressants, the choice road specialists make rely mostly on already known properties of traditional agents and on available financial resources. With this kind of approach development of unsurfaced road, designs are quite slow.

Global Road Technology has advanced products with proven effectiveness, which provide both road dust control and stabilization. GRT products are polymer-based agents which act by binding soil particles together. Their effectiveness is not dependant on climatic conditions and they are compatible with all soil types. Therefore, through use of GRT road dust control need for ex-situ aggregates is minimized or even eliminated. There is no risk of adverse short- or long-term effects on the environment. GRT dust suppressants are not susceptible to leaching and not easily broken down by UV rays, enzymes and soil microbes. The consequent high durability of the road positively affects maintenance cost savings.

GRT dust control largely contributes to driving quality and safety since rolling resistance of GRT treated roads are of the equivalent or slightly better quality than conventional sprayed chip seal surfaces. According to a case study, improvement of friction level through use of GRT treated road is 100% which positively influences work efficiency and safety.

 

GRT Dust Control & Suppression products are –

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