摘要
将不同掺量的SBS掺入TB沥青(terminal blend胶粉改性沥青)中,制得TB+SBS复合改性沥青.采用室内试验评价了SBS对TB沥青路用性能的改性效果,探讨了SBS对TB沥青路用性能的改性机理.结果表明:SBS能有效提高TB沥青的软化点和延度,降低其针入度.掺入3.0%(质量分数)的SBS可使TB沥青的PG分级从原来的58-28提高到70-28,使TB沥青混合料高温稳定性优于4.5%SBS改性沥青混合料.TB+3.0%SBS复合改性沥青是一种高、低温性能兼顾的产品.在相同目标空隙率下,综合考虑沥青混合料的疲劳性能、自愈合补偿作用以及高温稳定性,各种沥青混合料综合性能优劣排序为TB+3.0%SBS复合改性沥青混合料>4.5%SBS改性沥青混合料>TB沥青混合料>基质沥青混合料.SBS、胶粉、基质沥青三者之间交联紧密,形成了均匀、致密的TB+SBS复合改性沥青体系.
The composite modified asphalt was prepared by adding different use levels（by mass）of SBS to TB asphalt（terminal blend asphalt）.Laboratory test was conducted to investigate the enhancement effect of SBS on pavement performance of TB asphalt.The strengthening mechanism of SBS on pavement performance of TB asphalt was analyzed.Results show that SBS can improve softening point and ductility of TB asphalt effectively,and reduce the penetration.By mixing with 3.0% SBS,the PG grade of TB asphalt can reach 70-28 from 58-28.TB＋3.0% SBS composite modified asphalt mixture shows advantage in stability at high temperature over the 4.5% SBS modified asphalt mixture.TB＋3.0% SBS composite modified asphalt shows good performance at both high and low temperature.Considering the fatigue property,self-healing compensation effect and stability at high temperature under the same objective void ratio,the ranking of combination performance of various asphalt mixtures is as follows TB＋3.0% SBS composite modified asphalt mixture〉4.5% SBS modified asphalt mixture〉TB asphalt mixture〉base asphalt mixture.SBS,crumb rubber and base asphalt are well cross-linked to form a homogeneous and dense system.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2016年第3期522-527,共6页
Journal of Building Materials
基金
国家自然科学基金面上项目(51478351)
关键词
SBS
TB沥青
复合改性
路用性能
自愈合补偿作用
SBS（styrene-butadiene-styrene）
TB asphalt
composite modification
pavement performance
self-healing compensation effect
