Abstract: A novel modification agent, emulsified SBS, was developed to prepare modified asphalt emulsion. The effect of emulsifier dosage on the storage stability of modified asphalt emulsion was studied and the results showed that the optimum emulsifier dosage was 1%. By investigating the effect of emulsified SBS dosage on the softening point, ductility and penetration of modified asphalt emulsion, an optimum emulsified SBS dosage of 6% was obtained. It was shown by the analysis results of optical microscope that when the particle size and density of the particles of SBS and asphalt were similar, the SBS particles could be dispersed uniformly in the system. Based on the above optimum dosages of emulsifier and modification agent, a modified asphalt emulsion having excellent performance was prepared.

Key words: Emulsified SBS, Modified asphalt emulsion, Storage stability