Research On The Mechanism Of Aging And Regenerating Of SBS-Modified Asphalt

With the rapid development of highway construction in China, more and more high-grade highways need road maintenance and renovation, the demand for SBS modified asphalt pavement recycling techniques which are widely used in recent years is also increasing. This paper based on the former researches of aging and regenerating of SBS modified asphalt done by domestic and foreign scholars, deduced the mechanism of aging and regenerating of SBS modified asphalt and investigated the regeneration opportunity through the experimental study of natural and artificial aging of SBS modified asphalt.This paper made a summary of the composition and structure of asphalt and separated the four components of artificial aging asphalt at different times and natural aging asphalt, found out that during the aging process the content of asphaltene increased and the content of saturates, aromatics and resin decreased. So that the regenerating process added some saturates and aromatics as complement. Combined with the factors affecting the aging process of the asphalt, the mechanism of asphalt aging is analyzed from the angle of colloidal structure.This text focused on the microcosmic changes during the aging process by comparing the infrared spectrum of two series of natural and artificial aging asphalt. Used qualitative analysis and quantitative analysis to find out the differences of the sorts and concentration of the functional group under different aging conditions, the result showed that oxidation reaction is the main cause of aging and asphalts exhibit a high reactivity with oxygen during the initial period. Referred to the road performances of the aging asphalt and analyzed the mechanism of aging and regenerating from both the macro and the micro angle.Finally, by studying the infrared spectrum of the regenerated asphalt, made a deduction of the mechanism of SBS modified asphalt regeneration, and by adding the content of aromatics and forming a new chemical equilibrium to achieve the purpose of regenerating. Furthermore, this text investigated the regeneration opportunity by the control of penetration.