Colas has developed a specific pavement design method for reinforced road structures using Colgrill, based on feedback from the field over 30 years.
The Colgrill process involves reinforcing an asphalt mix with a mesh of heat-bonded glass fibers. The mesh considerably increases the lifespan of the mix and reduces its sensitivity to permanent distortions.
Tensile stress at the base of the reinforced mix layer is spread out optimally, making it possible significantly to reduce the thickness of the pavement structure.

Constructing or reinforcing a pavement with Colgrill brings down costs as well as greenhouse gas emissions (less aggregate, less binder, less transportation).
Colgrill can be used as reinforcement or as a new solution, particularly for urban thoroughfares (shallower excavation). It is also suitable for widening road ways and for treating slow and fast lanes differently.