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Appendix E 2 Cutting Back PMB or Multigrade Bitumen

This section provides guidance on the proportion of cutter to be added to the various classes of PMBs specified in Austroads (2014c) and multigrade bitumens in AS 2008.

The PMB cutting practice is based on the same principles that apply to C170 bitumen with the amount of cutter oil added related to the class of PMB, prevailing weather conditions, traffic, aggregate size, and type and condition of precoating. The primary purpose of cutting bituminous binders is to soften the binder temporarily to enable it to achieve adhesion and to keep the binder soft enough to allow traffic to fully embed the aggregate into the binder.