Abstract
The purpose of this study aims at investigating the effect of using nano silica as a modifier for SBS modified asphalt binder. In this study, the concentration of SBS (3%) was kept constant (taken from previous published research) and the Nano-silica concentration was varied from 1% to 3% (decided after literature survey). The effect of varying concentrations (1, 1.5, 2, 2.5 and 3%) of the nano silica (by weight of binder) on the SBS modified binder was evaluated by utilizing various physical tests like penetration, softening point, and ductility. The Rotational viscosity (RV) and Dynamic Shear Rheometer (DSR), Tests were used to analyze rheological properties of the base binder and nano silica polymer modified asphalt binder. In addition, the performance of modified asphalt after Thin Film Oven (TFO) (short-term aging) and Pressure aging Vessel (PAV) test (long term aging) were assessed as well. Furthermore, the storage stability of the modified asphalt binder was evaluated. Results showed that the addition of nano silica has a positive effect on the rutting performance of SBS modified asphalt binders. Storage stability of the SBS modified asphalt binders improved significantly after the addition of nano silica. Using softening point and rheological parameters (complex modulus (G*) and phase angle (δ)), the best values were possessed by 1.5% nano silica/3% SBS modified binder. During rheological characterization, it was found that as the complex modulus increases, phase angle decreases, Superpave Rutting parameter increases and failure temperature increases with increasing nano silica content. It was also found that Brookfield viscosity increases with an increasing nano silica concentration as the binder becomes stiffer. All the test results confirmed the fact that the nano silica-SBS modifier is effective in enhancing the high temperature properties (rutting resistance) of the soft grade binders and at the same time, it increases the elasticity of the binders.
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Salam, K., Mir, M.S., Mohanty, B. (2024). Rheological Investigation of Nano Silica-SBS Modified Soft Grade Bitumen. In: Singh, D., Maji, A., Karmarkar, O., Gupta, M., Velaga, N.R., Debbarma, S. (eds) Transportation Research. TPMDC 2022. Lecture Notes in Civil Engineering, vol 434. Springer, Singapore. https://doi.org/10.1007/978-981-99-6090-3_13
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