玉米油微胶囊沥青自修复微观机理  

Microscopic Mechanism of Self-healing Asphalt With Corn Oil Microencapsulated

作　　者：吕悦晶[1,2] 夏毅 汤文 钟闻华[3] 油川洲 LU Yuejing;XIA Yi;TANG Wen;ZHONG Wenhua;YOU Chuanzhou(School of Automotive and Transportation Engineering,Wuhan University of Science and Technology,Wuhan 430000,China;Highway Bureau of Qinghai Province,Xining 810001,China;Qinghai Transportation Planning and Design Institute Co.,LTD.,Xining 810001,China)

机构地区：[1]武汉科技大学汽车与交通工程学院,武汉430000 [2]青海省公路局,西宁810001 [3]青海省交通规划设计研究院有限公司,西宁810001

出　　处：《北京工业大学学报》2025年第5期586-594,共9页Journal of Beijing University of Technology

基　　金：青海省交通运输厅科技项目(2022-01)青海省重点研发与转化计划资助项目(2021-QY-207)。

摘　　要：为解决微胶囊沥青自修复微观机理尚未明确的问题,采用原位聚合法制备玉米油微胶囊,通过石油醚浸泡法测定囊芯质量分数并验证稳定性;借助荧光显微镜观察微胶囊形貌特征,设计玉米油微胶囊沥青划痕法自修复试验,并观测自修复行为;基于原子力显微镜试验获取自修复沥青的微观特征参数,并量化分析微胶囊对沥青自修复的影响。结果表明:所制玉米油微胶囊的壁材固化稳定,囊芯质量分数为52%;玉米油微胶囊个体呈不规则球状结构,粒径分布主要为0~30μm,平均粒径为23.7μm;划痕受力后的微胶囊破裂释放玉米油再生剂,再生剂通过毛细作用扩散并填充裂缝实现沥青的自修复;4%、8%微胶囊沥青样品表面的峰状结构平均面积分别减少17%、27%,均方根粗糙度修复率分别为36%、41%;玉米油微胶囊的加入降低了老化对沥青表面微观参数的影响,一定程度上对老化沥青进行了修复。所制玉米油微胶囊改变老化沥青组分可以实现对老化沥青的性能再生,可为沥青路面预防性养护提供科学依据。To solve the problem that the micro-mechanism of self-healing of microencapsulated asphalt is not clear,microcapsules of corn oil were prepared by in situ polymerization,the core content was determined using petroleum ether immersion method and the stability was verified.A fluorescence microscope was used to observe the morphology characteristics of microcapsules,and a scratch self-repair experiment of corn oil microcapsule asphalt was designed to observed the self-repair behavior.The micro-characteristic parameters of self-healing asphalt were obtained based on atomic force microscope test,and the influence of microcapsules on self-healing asphalt was quantitatively analyzed.Results show that the wall material of the prepared corn oil microcapsules is stable,with a core content of 52%.The corn oil microcapsules have irregular spherical structure,and the particle size distribution is mainly between 0 and 30μm,with an average particle size of 23.7μm.The microcapsule after the scratch stress breaks and releases the corn oil regenerant,which diffuses through capillary action and fills the crack to achieve self-healing of asphalt.The average area of peak structure on the surface of 4%and 8%microcapsule asphalt samples is reduced by 17%and 27%,respectively,with the repair rates 36%and 41%,respectively.The addition of corn oil microcapsules reduces the influence of aging on the microscopic parameters of the asphalt surface,and the aging asphalt is repaired to a certain extent.The corn oil microcapsules can change the content of aging asphalt components,achieving“performance regeneration”of aging asphalt and providing scientific basis for preventive maintenance of asphalt pavement.

关 键 词：预防性养护 沥青自修复 玉米油微胶囊 AFM技术 峰状结构 微观机理 

分 类 号：U414[交通运输工程—道路与铁道工程]