Foamed Bitumen Stabilised Pavements towards Western Australia Experience

摘要

Foamed bitumen stabilisation is a road construction technique where hot bitumen is converted tornbitumen foam by injecting a small quantity of cold water into it. It is mixed into the road pavement tornbind existing or imported granular materials to produce a bound but flexible pavement with superiorrnstructural properties to the original pavement. There have been trials and research projectsrnundertaken in Australia by Queensland Main Roads, some regional road networks in New SouthrnWales, and City of Canning, Perth, where the process has been adopted as a preferred rehabilitationrnmethod, but these projects did not develop a complete understanding of the characteristics andrnperformance of in-situ foamed bitumen stabilised pavements for Australian conditions. This paperrnreviews the results of research undertaken into the stiffness and fatigue performance of insitu foamedrnbitumen stabilised pavement materials at various sites in the Cities of Canning and Gosnells inrnWestern Australia. The aim of the research was to determine if a design relationship could berndeveloped to predict the fatigue life of insitu foamed bitumen stabilised pavements, and if the viscoelasticrnproperties of the bitumen binder were reflected in the stiffness and fatigue performance.