Correctly setting up the structural layers of the road surface is a prerequisite for high-quality renovation of roads with gravel, crushed stone (unbound) surfaces.
The renovation of gravel and crushed stone roads involves setting up three road surface layers:
- load-bearing top layer — often also serves as the wear layer, directly absorbing the traffic load;
- load-bearing base layer — disperses the traffic load transferred from the upper layer;
- frost-resistant layer — provides the frost resistance of the road surface structure, for stopping the capillary flow of water, for the removal of water that enters the road surface from the top and from the sides, and for its accumulation during the thawing of the structure.