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Title:: Influence of longterm aging on chemical constitution, morphology andrheology of base and SBS modified asphalt

Author(s):: ZHANG Henglong1; 2; XU Guoqing1; ZHU Chongzheng1; WU Chaofan2; HUANG Likui; 1. Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of HunanProvince, Hunan University, Changsha 410082, Hunan, China; 2. Hunan Provincial Engineering ResearchCenter for Construction Solid Wastes Recycling, Changsha 410205, Hunan, China

Keywords:: road engineering; SBS modified asphalt; ultraviolet aging; longterm thermaloxidative aging; Fourier transform infrared spectroscopy; gel permeation chromatography; atom force microscopy

PACS:: -

DOI:: -

Abstract:: To explore the change in chemical structure, morphology, and rheology performance of a base asphalt and SBS modified asphalt, the influence of ultraviolet (UV) aging and accelerated aging testing of asphalt binder using a pressurized aging vessel (PAV) on the physical performance and rheology of a base asphalt and styrenebutadienestyrene block copolymer (SBS) modified asphalt were investigated. In addition, Fourier transform infrared spectroscopy, gel permeation chromatography, and atom force microscopy were used to analyze the chemical structure and molecular weight distribution. The results show that the viscosity of two types of asphalt increase after aging, and the shearresistant properties are enhanced after aging with more elasticity. Moreover, the performance changes of the base asphalt are more noticeable when compared with SBS modified asphalt. The carbonyl index of the modified asphalt shows a larger increase, the SBS copolymers show a significant reduction, and the average molecular weight of the modified asphalt is larger than that of the base asphalt. In addition, typical beelike structures of the asphalt surface show a tendency toward degradation, and the amount and size of the beelike structures change significantly. Based on the roughness, with respect to the beelike phase region, the surface roughness of the two types of asphalts does not show a clear variation after UV aging, but show a significant increase after PAV aging. Moreover, with respect to the smooth phase region, the surface roughness of the modified asphalt does not show a clear variation, although the surface roughness of the base asphalt decreases more clearly after PAV aging as compared with UV aging. It can also be seen that the degree of PAV aging of the base asphalt and the SBS modified asphalt is more serious than that of the UV aging, and the introduction of an SBS modifier can improve the longterm thermaloxidative aging resistance of the asphalt, while clearly not weakening its longterm photooxidation aging resistance. 3 tabs, 14 figs, 22 refs.

Influence of longterm aging on chemical constitution, morphology andrheology of base and SBS modified asphalt(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

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