Maintenance of the existing road network is a critical point for every stake older. The main issues are very often: a) economical solution in order to aloud a good service level on the whole network with structural decrease of dotation budgets and b) environmental friendly solution in order to preserve the materials and the environment. With the background of these 2 main issues, recycling solutions are excellent solutions : economical aspect (it is cheaper to re-use instead of milling/evacuation/renew operation) and environmental aspects (less transport, less energy consumption, less fumes emission for cold solutions, smaller global carbon footprint …). Of course, deep analyses have to be undertaken on the road condition (structural and surface conditions) as well as on the materials themselves (relevant analyses in Laboratory). Road conditions measurements will permit a good pavement design corresponding to the traffic and lifetime data for the reinforcement or maintenance works.
On the second hand, the analyses on the materials of the existing layers will define the possible ways of recycling. Indeed, the type of recycling (cement, bituminous emulsion, bituminous foam, association of hydraulic and bituminous binders…) and the re-use conditions will be defined from the results of the Laboratory analyses (grading, fine content, binder content, ageing, residual mechanical performances…). The aim of the paper is to explain how the best solution is found (definition of the technic and design of the whole reinforcement or maintenance
structure) from the measurements done on the existing road.

recycing; environment; economy; maintenance; reinforcement