| The performance of SBS modified asphalt in natural environment and driving condition has seriously deteriorated, so that the pavement can no longer meet the use requirements.. The mature aging asphalt recycling technology can provide the recycled asphalt resources for road construction, and Research on the aging mechanism of SBS modified asphalt can provide technical reference for asphalt regeneration.. Supported by the National Natural Science Foundation of the thermal water coupling condition of SBS modified asphalt aging mechanism and high performance recycled agent development "to carry out research.Coupling aging before and after the modified asphalt performance testing found that modified asphalt aging penetration decreases, viscosity increases, increases the softening point, consistent with variation of asphalt of matrix. However, the asphalt aging degree of SBS modified asphalt, and its rut factor G*/sin Delta in some of the moment but decreases, which is different from the law of anti rut after aging of matrix asphalt.. In general, the anti aging properties of matrix asphalt is good, and the corresponding modified asphalt has better anti ageing properties, but it is also influenced by asphalt preparation and aging process.. There are no obvious differences between the two types of modifiers on the anti ageing effect of modified asphalt.. The temperature of 70 DEG C, temperature coupling aging effects of contribution rate reached 40% ~ 70% in, under the temperature of 50 DEG C temperature contribution to the aging rate between 30% to 50%, that is, the higher the temperature, the temperature contribution to the aging rate more.Coupling aging, change in modified asphalt containing oxygen hydroxyl groups,carbonyl and sulfoxide group content increased, indicating that aging of asphalt oxidation reaction occurs in the process, and from the SBS polymer butadiene groups decreased gradually, indicating that polymer degradation, and modified asphalt aging occurs after the structure of alienation and the aromaticity increased, the aliphatic side chain length increased. Asphalt are molecular mass polymer, homogeneous molecular weight decreases. The chemical changes of the main chemical changes during the coupling of the modified asphalt were oxidized and molecular structure was alienated by the comprehensive analysis..With grey correlation degree method of modified asphalt the macroeconomic performance and micro chemical structure carries on the contrast analysis, to carbonyl index and aromaticity represent modified asphalt coupling aging the aging degree of two aspects: the dissimilation of the oxidation and structure, and found that the aromaticity and penetration, softening point and viscosity of 135 DEG C associated with the degree of between 0.7 to 0.8, carbonyl index and penetration, softening point,135 DEG C on the viscosity of association degree between 0.6 and 0.9 that caused by oxidation and alienation of structure thermal coupling of the aging change of asphalt performance indexes changed a. |
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