ABSTRACT
This paper examines the various methods which are presently available in the United Kingdom to enable the recycling of bituminous road materials. It outlines the merits and disadvantages of each system ranging from ‘Hot mix off-site recycling at a central plant’ to the ‘Deep cold in-situ recycling’ process. The processes are defined and described and the potential of each operation is assessed by the authors. The paper suggests that in the future a very definite bias will be given towards the use of secondary materials in the sub-bases and road-bases and highlights how a substantial saving of primary aggregates may be made if their place can be taken by secondary materials. The enhancement of secondary materials is considered and the paper concludes by suggesting possible future developments in the light of impending European Standards.
