there is potential for improving the compaction of dense roadbase and basecourse macadam in the critical wheel-path zones which determine the structural performance of pavements. the report considers the effect of cooling of bituminous layers on compaction and describes a procedure which should expedite the rolling process and ensure that adequate compactive effort is applied before the material has cooled excessively. proposals are made for an improved method specification. it is hoped that reductions in the design thickness of dense coated macadams can be made when improvement in compaction in the wheel-paths has been demonstrated at several sites.(a)

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