摘要
以AH-70为基质沥青,加入经糠醛抽出油预溶胀的苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS),外掺胶粉制备复合改性沥青(SBS/CRMA)。通过正交试验考察糠醛抽出油掺量、胶粉掺量、搅拌温度和搅拌时间对改性沥青性能的影响,采用动态剪切流变仪对SBS/CRMA、SBS改性沥青(SBSMA)和胶粉改性沥青(CRMA)的流变性能进行分析,并通过荧光显微镜观察SBS/CRMA的微观结构。由正交试验得到最优方案为:糠醛抽出油掺量8%(质量分数)、胶粉掺量25%(质量分数)、搅拌温度210℃和搅拌时间2.5h。在最优方案下制得SBS/CRMA的5℃延度为327mm、软化点为78.0℃、弹性恢复91.6%。SBS/CRMA在低温下更柔韧,高温下更坚硬,温度敏感性降低,抗车辙形变能力增强。结合荧光显微镜结构图,提出了SBS/CRMA的三维网络结构模型。
Modified asphalt（SBS/CRMA）was prepared using AH-70 as the basic asphalt and adding styrene-butadiene-styrene block copolymer（SBS）pre-swelled by furfural extract oil and crumb rubber.Effects of the amount of furfural extract oil and crumb rubber,stirring temperature and stirring time on the properties of modified asphalt were investigated through orthogonal experiment.Dynamic shear rheometer（DSR）was used to analyze the rheological properties of SBS/crumb rubber composite modified asphalt（SBS/CRMA）,SBS modified asphalt（SBSMA）and crumb rubber modified asphalt（CRMA）.Fluorescence microscope was used to observe the microstructure of SBS/CRMA.The results showed that SBS/CRMA has 5℃ ductility of 327 mm,softening point of 78.0℃,and elastic recovery of 91.6% under the optimized preparation conditions of furfural extract oil of 8%（mass fraction）,crumb rubber amount of 25%（mass fraction）,stirring temperature of 210 ℃ and stirring time of 2.5h.SBS/CRMA is more flexible at low temperature and harder at high temperature,and shows better temperature susceptibility and better rutting resistance.Combining the fluorescence microscope graph of SBS/CRMA,a model of three-dimensional network structure was proposed.
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第1期21-27,共7页
Journal of East China University of Science and Technology
关键词
SBS
胶粉
改性沥青
机理
SBS
crumb rubber
modified asphalt
mechanism
