Study on the influence of anti stripping agent on the rheological properties of asphalt at high and low temperatures

Abstract

In order to compare the effects of different anti stripping agents on the rheological properties of asphalt at high and low temperatures, four typical anti stripping agents, amine PA-1, non amine XT-2, hydrated lime, and cement, were selected. The complex modulus (G*), phase angle (δ), rutting factor (G*/sinδ), creep stiffness (S), and creep rate (m) were measured using the dynamic shear rheometer (DSR) and the bending beam rheometer (BBR). The microscopic mechanism was analyzed using fourier transform infrared spectroscopy (FTIR) and fluorescence microscopy (FM). The results showed that lime and cement significantly improved the high temperature performance of asphalt, with an average increase of 1.4 and 0.8 times in G */sinδ. However, PA and XT reduced the high temperature performance, with an average decrease of 19% and 11% in G */sinδ. PA and XT have little effect on the low temperature performance of asphalt, but lime and cement will reduce the low temperature performance, with an average increase of 64% and 49% in S. The results of FTIR and FM indicate that lime and cement undergo chemical reactions with asphalt, while PA and XT do not, but PA and XT can promote the swelling of modifiers in asphalt.