摘要
为有效解决当前聚合物改性沥青生产所面临的改性剂用量多、热储存稳定性差、热力学不稳定等难题,采用聚氨酯前驱体基反应型改性剂(polyurethane-precursor-based reactive modifier,PRM)和苯乙烯-丁二烯-苯乙烯嵌段共聚物(styrene-butadiene-styrene,SBS)制备了PRM/SBS复合改性沥青,并以基质沥青、PRM改性沥青和SBS改性沥青为参照,采用宏-微观相结合的方法对PRM/SBS复合改性沥青的性能和改性机理进行了研究.结果表明,复合改性过程兼具物理改性和化学改性,PRM不仅能够与沥青分子产生明显的化学交联,同时可以作为沥青质和SBS之间的相容剂,促使PRM/SBS复合改性沥青内部形成更为稳定的网络结构.基于上述作用机制,PRM的加入极大提升了SBS改性沥青的热储存稳定性.PRM/SBS复合改性沥青较同等改性剂掺量SBS改性沥青具有更优的抗高温永久变形能力且具备良好的低温性能.
To effectively solve the problems of large amount of modifier,poor thermal storage stability,and thermodynamic instability faced by the current production of polymer modified asphalt,the polyurethane-precursor-based reactive modifier(PRM)and styrene-butadiene-styrene(SBS)were employed to prepare the PRM/SBS composite modified asphalt in this study.Taking base asphalt,PRM modified asphalt and SBS modified asphalt as references,the performance and modification mechanism of PRM/SBS composite modified asphalt were studied by macro-micro methods.Results show that the composite modification process presents both physical and chemical characteristics.PRM can not only produce obvious chemical cross-linking with asphalt molecules,but also act as a compatibilizer between asphalt and SBS to promote the formation of a more stable network structure in PRM/SBS composite modified asphalt.Based on the above mechanism,the addition of PRM significantly improves the thermal storage stability of SBS modified asphalt.PRM/SBS composite modified asphalt has higher resistance to high-temperature permanent deformation than SBS modified asphalt with the same modifier content,and it presents a good low-temperature performance.
作者
李鹏飞
胡观峰
王大为
陶洁璇
王东旭
洪斌
LI Pengfei;HU Guanfeng;WANG Dawei;TAO Jiexuan;WANG Dongxu;HONG Bin(Highway Engineering Cost Station of Heilongjiang Province,Harbin 150008,China;Heilongjiang Province Longjian Road&Bridge Fifth Engineering Co.,Ltd.,Harbin 150077,China;School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,China;Heilongjiang Highway Construction Center,Harbin 150040,China;Hatong Branch of Expressway Operation and Management of Heilongjiang Transportation Investment Group Co.,Ltd.,Harbin 150056,China)
出处
《北京工业大学学报》
CAS
CSCD
北大核心
2022年第6期655-666,共12页
Journal of Beijing University of Technology
基金
黑龙江省交通运输厅科技项目(2020-230000-54-01-086348)
国家重点研发计划资助项目(2019YFE0116300)
黑龙江省自然科学基金资助项目(JJ2020ZD0015)。
关键词
道路工程
PRM/SBS复合改性沥青
宏-微观性质
化学改性
材料性能
改性机理
road engineering
polyurethane-precursor-based reactive modifier and styrene-butadiene-styrene(PRM/SBS)composite modified asphalt
macro-and micro-properties
chemical modification
material properties
modification mechanism