Monitoring the Rheological Properties of Asphalt Cement after Digestion with Micro and Nano Size Additives

The Asphalt binder usually practices ageing throughout its service life due to the environment.The asphalt binder will practice changes in the rheological properties and loses the required flexibility, its adhesion to the aggregates and cohesion.Implication of Micro and Nano size additives can enhance the quality of the binder and extend its useful life.In the present investigation, two types of asphalt binder with penetration grade (40-50 and 60-70) were digested with micro size additive (Fly ash, and hydrated lime) and Nano size additive (Fumed silica and silica fumes).The treated binders were subjected to the rheological properties determination.It was observed that for (40-50) and (60-70) binders, the penetration viscosity number declines by (2.8, 0.3, 1.4, and 1.4) % and (1.7, 1.2, 2.1, and 0.6) % for (Fly ash, fumed silica, silica fumes, and hydrated lime) treated binder respectively.For (40-50) and (60-70) asphalt binder, the viscosity increases by (5.8, 33.4,54.4, and 43.6) % and (102.5, 135.5, 112, and 12) % for (Fly ash, fumed silica, silica fumes, and hydrated lime) treated binder respectively.For (40-50) and (60-70) binders, the creep stiffness increases by (5, 25, 35, and 32.5) % and (6.2, 12.5, 18.7, and 25) % when fly ash, fumed silica, silica fumes, and hydrated lime were implemented.It can be revealed that implementation of Nano size additives exhibits higher creep stiffness and lower temperature susceptibility when compared with Micro size additives.