Cold in-situ recycling of structural pavement layers

In-situ recycling of pavement materials has become an increasingly important feature in the UK for the maintenance of highways. The concept of using the existing highway as a “linear quarry” from which roadstone aggregates can be reclaimed has gained favour for both environmental and economic reasons and has been the subject of a three year research programme at the Transport Research Laboratory (TRL). The project, which was sponsored by the Highways Agency, CSS (formerly the County Surveyors Society) and Colas Limited, addressed the use of the technique for the structural maintenance of roads carrying between 2.5 and 20 million standard axles (msa).