Recycling of pavements is a technique whereby an existing degraded pavement is modified and transformed into a homogeneous structure that can support the traffic requirements. More specifically, it involves reusing the materials from the existing pavement for the construction of a new layer, including:
Most often, these operations are performed in-situ.
The homogeneous mixture is compacted and cured appropriately, resulting in a base or a layer with a satisfactory structural contribution to a new pavement.
A sealing coat is then applied on the recycled layer to protect it against traffic during the works, with one or two layers of asphalt concrete later applied to ensure the functionality and bearing capacity of the pavement.
Using cement bound recycling, a homogeneous and stable layer of an adequate thickness to be obtained, with mechanical characteristics similar to those of a soil/cement or a cement-bound base.
Therefore, with cement bound recycling the bearing capacity can be substantially increased or, conversely, pavement deflections, subgrade stresses and strains can be greatly decreased. Moreover, existing ruts can be appropriately corrected if the thickness of the bound layer is increased.
Recycling of a pavement in place leads to:
Pavement recycling is used for a number of applications, from heavy traffic motorways to low volume roads. Airport pavements have also been constructed with recycled pavement materials and cement.