Influence of hydrated lime on the properties of filler-bitumen composite

To guarantee the quality of warm mix asphalt, one of the prerequisites is to provide adequate adhesion between the bituminous binder and the aggregates. To achieve this goal, filler-bitumen mixes were examined with a replacement of mineral filler with hydrated lime in amounts of 0%, 10%, 20%, 30% and 40%. A 35/50 bitumen was used as a binder in the filler-bitumen mix in amounts of 4.8%, 5.1%, 5.4% and 5.8%. The assessed properties of filler-bitumen composite comprised: penetration, softening point and Fraass breaking point. The influence of the hydrated lime on the properties of the filler-bitumen compound was found to be significant and beneficial.