Performance of Hydrated Cement Treated Crushed Rock Base as a Road Base Material in Western Australia

摘要

Hydrated Cement Treated Crushed Rock Base (HCTCRB) is produced by adding 2%-Portland cementrnwith standard crushed rock base. The mixture is disturbed after the specific hydration period tornprevent setting up and retain its unbound property. HCTCRB has been commonly adopted forrnWestern Australian roads, however based on empirical method and experiences. Thus, therncharacterisation of HCTCRB following the pavement mechanistic approach is needed. This paperrnaims to presents the performances of HCTCRB in terms of permanent deformation and resilientrnmodulus. The repeated load triaxial tests were performed to study the performances of HCTCRB thatrnaffected by manufacturing (hydration period) and construction procedures (amount of water addedrnduring compaction and dry back). This study has found that HCTCRB exhibited the stress dependentrnbehaviour. All these studied factors significantly affect the resilient performances of HCTCRB inrndissimilar trends. The certain impact on the material performances related to the hydration periods stillrncould not be concluded. The higher water addition even at the optimum moisture content of HCTCRBrnresulted in the poorer performances, although it induced the higher dry density, which indicated thatrnthe HCTCRB is still susceptibility to moisture content. The dryback process has potential to improvernthe material performances of the material in different level which depends on amount of additionalrnwater. All the tested results indicated the significant influence of moisture content to the performancesrnof HCTCRB with regardless of the dry density.