Study on Chemical Modification of SBS Modified Asphalt with Chemical Modifier

Cross link,graft,addition reaction are taken place between double bond of SBS and the active functional groups of asphalt by adding the chemical modifier in the SBS modified asphalt.The property tests show that the softening point of SBS modified asphalt is improved by 48% after modified by active amine Modifier A,making the high temperature property highly improved.The high and low temperature properties are all greatly improved by polycyclic Modifier B, especially the low temperature is improved by 184%.The DSC tests show that the temperature stability are improved by 22 % and 8% respectively,after modified by Modifier A and B.TG curve also indicates that the temperature stability of SBS modified asphalt can be improved by chemical modifier.Three-dimensional mesh structures is formed between the SBS and original asphalt by chemical bonds,the qualities of SBS modified asphalt are greatly improved.