the literature reviewed in this report covers laboratory and field work on the compaction of bituminous materials. a large number of factors which influence compaction are considered in an attempt to provide a general indication of the various trends that may be expected to occur in practice.the relevant factors include aggregate type and gradation,mix composition,type of subgrade,rolling equipment and procedures,lift thickness and rolling temperature.the difficulties involved in direct application of results of laboratory and field studies to construction work in general are stressed.pilot-scale laboratory experiments provide a means of better control of factors and yield information which may be more readily and directly applicable to field construction projects (a).

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