摘要
为改善环氧沥青的柔韧性,促进其在桥面铺装中的应用,采用聚氨酯(PU)和环氧树脂(EP)复合改性沥青。通过拉伸性能和粘度测试研究了PU和EP含量对沥青性能的影响,并借助扫描电镜(SEM)和激光扫描共聚焦显微镜(LSCM)揭示PU/EP含量增加时沥青试件断面形貌和相态分布的演变过程。结果表明,添加PU能够改善环氧沥青的柔韧性,PU/EP复合改性沥青容留时间满足施工要求。试件断面粗糙度随着PU/EP含量提高而增加,PU/EP质量分数40%时体系内已形成交联网状结构。此外,PU/EP质量分数高于40%时改性剂团聚,不利于材料的稳定储存。最终,确定PU和EP的最佳用量分别为复合改性沥青质量的8%和32%。
In order to improve the flexibility of epoxy asphalt and promote its application in bridge deck paving, the polyurethane(PU)and epoxy resin(EP) were used to to prepare composite-modified asphalts. The effects of PU and EP contents on asphalt performance were studied through tensile performance and viscosity tests. The scanning electron microscope(SEM) and laser scanning confocal microscope(LSCM) were used to reveal the the evolution process of the cross-section morphology and phase distribution of the asphalt specimen when the PU/EP content was increased. The results showed that the addition of PU could improve the flexibility of epoxy asphalt, and the retention time of PU/EP composite modified asphalt met the construction requirements. The section roughness of the specimen was increased with the increase of PU/EP content.The cross-linked network structure was formed in the system when the the mass fraction of PU/EP was 40%. In addition, when the mass fraction of PU/EP was higher than 40%, the modifier agglomerated, which was not conducive to the stable storage of the material. Finally, the optimal amounts of PU and EP were determined as 8 wt% and32 wt% of the composite-modified asphalt, respectively.
作者
孙佳
张增平
王封
黄志刚
SUN Jia;ZHANG Zeng-ping;WANG Feng;HUANG Zhi-gang(School of Transportation,Southeast University,Nanjing 211189,China;Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang'an University,Xi'an 710064,China;Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Scrfety of Plastics,Beijing Technology and Business University,Beijing 100048,China)
出处
《热固性树脂》
CAS
CSCD
北大核心
2022年第1期1-4,11,共5页
Thermosetting Resin
基金
陕西省交通运输厅交通科研项目(17-06K)
塑料卫生与安全质量评价技术北京市重点实验室开放课题(QETHSP2020003)。
关键词
聚氨酯
环氧树脂
复合改性沥青
拉伸性能
柔韧性
polyurethane
epoxy resin
composite modified asphalt
tensile property
flexibility
