Abstract: To prepare rubber modified asphalt with high storage stability, asphalt was composite modified with SBS, aromatic oil, TOR, stabilizer and rubber powder based on high temperature mixing process. The preparation method of rubber modified asphalt was proposed. The influence of modifiers on the general performance and rheological properties of asphalt were analyzed. The dispersion effect of the modifier in the asphalt was observed by the fluorescence test. The results show that the high temperature performance of asphalt is improved by adding 40 mesh (380 μm) rubber powder with a mass fraction of 25%. Storage stability of rubber asphalt is improved by shearing at 180 ℃ for 60 min to 90 min and then swelling 60 min. The degree of swelling and dispersion of rubber powder are improved by adding compatibilizers and stabilizers, and different modifiers have a synergistic effect on the asphalt performance. Composite modified asphalt has good elastic recovery ability and deformation resistance in high temperatures. The swelling degree and dispersion uniformity of rubber powder and SBS in asphalt are the direct factors to affect the general performance and storage stability of asphalt.

Key words: rubber asphalt, preparation process, compound modification, road performance, storage stability