FAQ's
Frequently Asked Questions
How do we determine if our material is compatible?
Samples should be taken and subjected to a hydrometer test, grain sieve analysis and Atterberg Limit evaluation. These tests enable us to tell whether any gravel or clay needs to be added to the soil or if the existing material is suitable.
How well does GRAVELOCK work with highly plastic clays and/or Asphalt?
GRAVELOCK works very well in highly plastic soils and reduces it’s shrink/swell characteristics GRAVELOCK is effective with milled asphalt provided it is broken down to 20mm or smaller particle size.
How much prep time is needed?
There is a distinct improvement in the workability of the soil after applying GRAVELOCK. This saves time when grading and placing the soil. During the compaction stage, the number of passes required with the various compactors is reduced- often up to 50%.
How do we prepare our roads for treatment with GRAVELOCK?
Prepare the road by clearing the ditches and pulling shoulders, shape the road. Scarify the road to a depth of 20 cm.
What do we do with existing soft spots or frost boil?
In most cases the areas should be excavated and backfilled with appropriate pit run material then apply geotextile before placing subgrade.
Some roads have poor drainage; will this effect the end result?
Yes, it will. Good drainage is vital to extending the life of any road. Proper drainage must be provided on either side of the road.
Is a suitable surface crown important?
A suitable crown is vital for the longevity of a road. It is essential that a crown of 4% be maintained on a road.
What if we don’t want to do it ourselves?
A construction company may be recommended.
Do you need to repeat the treatment?
The reaction of GRAVELOCK with the clay particles in the soils is permanent. Some existing roads have been in use for over 20 years and have shown little or no deterioration over this period. If treatment is required at all, it would only be if additional material is imported.
