Investigation on Effect of Filler on Aging Behaviour of Paving Grade Bitumen

Currently, majority of the Indian roads are flexible pavements the ones having bituminous layers. The durability and the long term satisfactory performance of pavements are always influenced and affected to a greater extent by the employed pavement ingredient materials and their inherent properties. It properties changes as it ages bulk storage, transport and storage on site. When the bitumen is age hardened, the asphalt mixture will become brittle and its ability to support traffic-induced stresses and strains may significantly reduce. The main mechanisms of aging of bitumen are oxidation and loss of volatiles. In this present study hydrate lime and concrete dust is used in various percentages (1%, 2%, 3% and 4%) as modifiers in VG-30 bitumen. The effect on physical properties in terms of penetration, softening point and viscosity before and after aging are measured. The binders are aged using Thin Film Oven Test (TFOT). Before aging penetration is decreases and viscosity and softening point value is increases with increasing percentage of filler material. After aging penetration of aged binders decreases then unaged binder. Softening point increases of aged binders than unaged binders. Increase in softening value is less for binder having 4% hydrate lime and concrete dust as filler than other binders after aging. For binder having 0% hydrate lime and 3% concrete dust has less increase in viscosity value than other binders.