Cutback priming and primersealing is long established road surfacing practice in Australia. By contrast emulsion systems have only been around for about the last decade. The conventional cutback treatments rely on kerosene or cutter to provide a suitable binder viscosity to facilitate adhesion of the cover aggregate to new road base. However, an undesirable side effect of this use of cutback binders in is the risk of retained cutter migrating into the final seal binder resulting in seal flushing and bleeding in the wheel paths in subsequent hot seasonal conditions. Bitumen emulsions have been successfully adapted for priming and primersealing applications to address some of the short comings of cutbacks and to also provide a number of additional benefits. This paper outlines the fundamental differences between the two types of system with reference to specific field applications. (a) For the covering entry of this conference, please see ITRD abstract no. E217100.
Abstract