Influence of Nano size hydrated lime filler on rutting performance of asphalt mastic: Fid-Bau Portal

Influence of Nano size hydrated lime filler on rutting performance of asphalt mastic

Das, Aditya Kumar / Singh, Dharamveer

The present study was carried out to evaluate effects of regular sized hydrated lime (RHL) and Nano-sized hydrated lime (NHL) on rutting resistance performance of asphalt mastic related to stiffness, creep, relaxation and recovery properties. The study utilises AC-30 binder with different combinations of basalt-RHL and basalt-NHL fillers for the preparation of asphalt mastic specimens. The dosages of RHL and NHL fillers were chosen as 0%, 5%, 10%, 15% and 20% by weight of asphalt binder, and percentage of basalt filler were adjusted accordingly to meet a filler to binder (F/B) ratio of 0.8 (by mass ratio). The rutting performance of asphalt mastic at high temperatures was evaluated using different tests such as Superpave rutting factor, static shear creep, and high stress Multi Stress Creep Recovery (MSCR). Overall test results indicate that specific surface area and interaction properties of RHL and NHL fillers with asphalt have a significant effect on the rutting performance of asphalt mastic. The results from Superpave rutting factor, static shear creep, and high stress MSCR test showed that both RHL and NHL filler have the potential to enhance the rutting resistance properties (stiffness, recovery and creep) of asphalt mastic, also, combination of basalt and NHL filler had superior performance than combination of basalt and RHL filler. In addition, asphalt mastic with NHL filler found to be less sensitive to high stress levels and thus, possessed better viscous and elastic response compared to RHL filler. Furthermore, asphalt mastic with a lower percentage of NHL filler had better rutting resistance performance (related to stiffness, creep, relaxation and recovery) over mastic with a higher percentage of RHL fillers.