By adding Dustex to the to top 6-10 inches (15-25 cm) of the road base, the load bearing capacity and stability of the base is increased significantly. In many cases, it is achieved without the addition of new gravel. The base will withstand greater stress and the degradation of the overlying hard surface will be minimized.
Borregaard, the Roads Directorate and the Norwegian Public Roads Administration have worked together to use Dustex on several projects with excellent results.
Watch our video presentation about a road stabilisation study with a lignosulfonate binder that was initiated in Norway in 2001 - and see how the stabilised roads still perform 15 years later!
Dustex is used on forest roads as well. Mild and humid winters, among other things, can hinder the transport of wood on these roads. Applying Dustex to the top 6-10 inches (15-25 cm) of the road creates a higher load capacity and more efficient wood transport.
The integration of Dustex into the soil is most effectively accomplished using asphalt grinding equipment, but other equipment can be used as needed.
Stabilisation of soils in-depth and in-situ
- Examine the road surface and determine if it is necessary to add gravel to improve its characteristics. Milling must be done while the road is not too wet when Dustex is added.
- Before applying Dustex, level the road with a grader and create a small berm along the edges. This helps to retain Dustex on the road surface.
- Apply the Dustex concentrate at the recommended rate of 1.25 gal per yd2 (5-6 liters per m2) for a milling depth of 6-10 inches (15-25 cm). After application of Dustex, milling should occur as soon as possible to facilitate even mixing.
- Shape and level the road with a grader. Maintaining the thickness of the stabilised layer across the width and length of the road. Then compact with light vibration.
- Finally, apply a thin layer of Dustex diluted with water at a ratio of 1:2.
If asphalt is to be applied following stabilisation, this should be done only after allowing time for the drying and curing of the DUSTEX stabilised soil.