TLA/SBS复合改性沥青配比及性能研究  

Ratio and performance of TLA/SBS composite modified asphalt

作　　者：王文强 孟紫璇 WANG Wenqiang;MENG Zixuan(Foshan Communications Investment Group Co.,Ltd.,Foshan 528313,China)

机构地区：[1]佛山市交通投资集团有限公司,广东佛山528313

出　　处：《交通科学与工程》2025年第2期144-153,共10页Journal of Transport Science and Engineering

基　　金：国家自然科学基金资助项目(52378123)。

摘　　要：【目的】针对不同特立尼达湖沥青(Trinidad Lake Asphalt,TLA)掺量的苯乙烯-丁二烯-苯乙烯嵌段共聚物(styrene-butadiene-styrene,SBS)复合改性沥青,通过建立宏观和微观性能技术指标体系揭示TLA和SBS提升复合改性沥青性能的作用机理,为沥青路面材料的优化提供理论支撑。【方法】采用试验分析方法,设计了13组不同质量配比的TLA/SBS复合改性沥青试验。通过对复合改性沥青的软化点、针入度、延度等性能指标进行测试并结合微观结构表征,揭示不同的TLA掺量对复合改性沥青性能的影响机理。【结果】TLA掺量的增加能显著地提升复合改性沥青在高温下的稳定性,TLA掺量每增加1%,软化点就提高0.221℃,并且TLA掺量的增加能降低复合改性沥青对温度的敏感性;TLA中的灰分均匀分布形成的粗糙表面与孔隙协同作用,增强了基体的稳定性;根据AC-10型沥青混合料的施工要求,确定TLA和SBS最佳质量比为3∶7;微观分析表明,火山灰质灰分的叠加可增强沥青界面之间的结合,SiO_(2)基矿物的组成及其独特的粒度分布可显著地改善复合改性沥青胶浆的黏韧性,通过调控灰分的分布可显著地改善复合改性沥青的性能。【结论】研究结果可为湿热地区重载交通条件下沥青路面的材料设计与性能提升提供方法和依据。[Purposes]This study aims to establish macro and micro technical performance indicator systems for Trinidad Lake Asphalt(TLA)/styrene-butadiene-styrene(SBS)composite modified asphalt with varying TLA dosages,elucidate the mechanism of performance enhancement by TLA and SBS,and provide theoretical support for optimizing asphalt pavement materials.[Methods]Experimental analysis was employed,involving 13 groups of TLA/SBS composite modified asphalt with different mass ratios.The influence of TLA dosage on composite modified asphalt performance was investigated through performance tests(softening point,penetration index,maximum tensile force in force ductility tests)and microstructural characterization.[Findings]The results demonstrate that increasing TLA dosage significantly improves the high-temperature stability of the composite modified asphalt,with the softening point increasing by 0.221°C per 1%TLA dosage increase,while reducing temperature sensitivity.The uniform distribution of ash phases enhances matrix stability through synergistic effects of surface roughness and pore structure.Based on the construction requirements of AC-10 asphalt mixtures,the optimal mass ratio is determined as TLA∶SBS=3∶7.Microstructural analysis reveals that pozzolanic ash phases strengthen interfacial bonding via a superposition effect,and the SiO_(2)-based mineral composition and unique particle size distribution of TLA significantly improve the toughness and tenacity of the composite modified asphalt mortar.The composite modified asphalt performance can be improved significantly through regulating the ash phase distribution.[Conclusions]The findings provide a method and a basis for material design and performance improvement of asphalt pavement for heavy-duty traffic in humid,hot regions.

关 键 词：特立尼达湖沥青 复合改性沥青 温度敏感性 微观结构 最佳配比 

分 类 号：U414[交通运输工程—道路与铁道工程]