Property improvement of Nano-Montmorillonite/SBS modified asphalt binder by naphthenic oil

Though Nano-Montmorillonite/SBS modified asphalt binder has excellent high temperature property and storage stability, the weak low temperature property restricts its application. This problem may be tackled by naphthenic oil. In this paper, the SBS modified asphalt binder with two additives-naphthenic oil and NMT was prepared. A serial of experiments was designed based on the DSR. The results of DSR tests show high/low temperature property, aging property, and stability of the binder with the two additives added at 25 combinations. It was found that the two additives counterbalance the effect of each other in high/low temperature properties. Furthermore, a weighting method was employed to determine the optimum dosage of the additives that ensures balanced good properties of binder. Finally, the phase structure analysis and quantitative analysis were carried out on AFM image to explain the mechanism of the modification. It was proved that both additives play their own advantages at the optimum dosage. (C) 2020 Elsevier Ltd. All rights reserved.