摘要
自修复微胶囊是解决沥青路面开裂问题的一种新方法。制备了不同芯壁比的微胶囊,并从形貌、粒径、囊芯含量、包覆率、分布情况和耐热性能方面对其性能进行了比较。此外,以菜籽油(rapeseed oil,RO)和商品芳香油(aromatic oil, AO)为原料,研制了一种用于微胶囊芯的复合愈合剂。通过比较复合愈合剂对老化和未老化沥青的愈合效果,确定了RO和AO的最佳比例。RO/AO的比例推荐为2∶1,以达到87%的最高愈合率和降低生产成本的目的。结果表明,微胶囊的最佳芯壁比为1∶1,此时微胶囊性能最稳定。此外,发现RO对未老化的沥青胶结剂愈合效果最好,而AO对老化沥青胶结剂的愈合效果最好。最后,确定含复合愈合剂的微胶囊的推荐掺入量为沥青质量的0.5%。
Self-healing microcapsule is a new method to address the cracking issue of asphalt pavement. In this paper, the microcapsules with various core/wall ratios are prepared, and their properties are compared in terms of the morphology, particle size, content of core, distribution uniformity in asphalt, productivity, and high-temperature stability. Furthermore, a compound rejuvenator is developed for microcapsule core by jointly using the rapeseed oil(rapeseed oil, RO) and a commercial aromatic oil(aromatic oil, AO). The optimal ratio between RO and AO is determined by comparing the healing effect of compound rejuvenator on both aged and unaged asphalt binder. The RO/AO ratio is recommended to be 2∶1 so as to reach the highest healing rate of 87% and to lower the core material cost for producing microcapsules. The results show that the optimal core/wall ratio is 1∶1, when the microcapsule achieves the most stable performance. In addition, the RO is found the most effective to heal the unaged asphalt binder while the AO is superior to heal aged asphalt binder. Finally, the recommended incorporation of microcapsule containing compound rejuvenator is 0.5 wt% of asphalt.
作者
何亮
孟森
黄义洲
陈建兵
李金平
HE Liang;MENG Sen;HUANG Yi-zhou;CHEN Jian-bing;LI Jin-ping(State Key Laboratory of Road Engineering Safety and Health in Alpine and High Altitude Areas,Xi'an 71oooo,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《公路》
北大核心
2023年第2期1-10,共10页
Highway
基金
高寒高海拔地区道路工程安全与健康国家重点实验室开放基金,项目编号YGY2020KYPT-05
重庆市自然科学基金面上项目,项目编号cstc2020jcyj-msxmX0431
国家自然科学基金中英国际合作与交流项目,项目编号52111530134。
关键词
沥青路面
自愈微胶囊
复合愈合剂
沥青路面修复
asphalt pavement
self-healing microcapsule
composite healing agent
asphalt pavement repair
