摘要
为探究基质沥青和SBS改性沥青不同长期老化过程中化学组成、形貌及流变性能的变化,研究了紫外(UV)老化与压力老化箱(PAV)加速沥青老化试验对基质沥青与苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改性沥青物理和流变性能的影响,采用傅里叶红外光谱(FTIR)、凝胶渗透色谱(GPC)和原子力显微镜(AFM)探讨了长期老化过程中2种沥青化学组成与形貌的变化。研究结果表明:老化后2种沥青黏度均增大,抗剪切变形能力提高,沥青中的弹性成分增加,基质沥青的性能变化比SBS改性沥青更为明显;老化后改性沥青羰基指数增加幅度更大,SBS分子数量明显减少,改性沥青平均分子量比基质沥青变得更大,尤其PAV老化后SBS改性沥青中大分子比率明显增加;老化后沥青表面的典型蜂状结构遭到破坏,蜂状结构的数量和尺寸有较大变化。对于蜂相区域,2种沥青UV老化后,表面粗糙度变化较小,而PAV老化后,表面粗糙度显著增加;对于平滑相区域,SBS改性沥青表面粗糙度老化前后无显著变化,基质沥青表面粗糙度老化后降低,并且PAV老化后粗糙度比UV老化降低更明显;基质沥青和SBS改性沥青PAV老化后老化程度明显高于UV老化,且添加SBS改性剂能提高沥青长期抗热氧老化方面性能,对长期抗光氧老化方面性能的提升不明显。
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 resista
作者
张恒龙
徐国庆
朱崇政
吴超凡
黄立葵
ZHANG Heng-long;XU Guo-qing;ZHU Chong-zheng;WU Chao-fan;HUANG Li-kui(Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, Hunan University, Changsha 410082, Hunan, China;Hunan Provincial Engineering Research Center for Construction Solid Wastes Recycling, Changsha 410205, Hunan, China)
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第2期10-18,56,共10页
Journal of Chang’an University(Natural Science Edition)
基金
国家自然科学基金项目(51678232)
湖南省自然科学基金项目(2017JJ3015)
湖南省交通运输厅科技进步与创新计划项目(201705)
长沙市科技计划项目(kc1703038
kq1706018)
关键词
道路工程
SBS改性沥青
紫外老化
长期热氧老化
红外光谱
凝胶渗透色谱
原子力显微镜
road engineering
SBS modified asphalt
ultraviolet aging
long-term thermal-oxidative aging
Fourier transform infrared spectroscopy
gel permeation chromatography
atom force microscopy
