Research Progress of Interfacial Fusion Characteristics Between Emulsified Asphalt and RAP
WANG Zhenjun1,2,*, YAN Fengfeng1, ZHANG Hanxiao1, LIANG Qingyun1
1 School of Materials Science and Engineering, Chang’an University, Xi’an 710061, China 2 Engineering Research Center of Pavement Materials, Ministry of Education of P.R. China, Xi’an 710064, China
Abstract: In recent years, asphalt pavement regeneration technology have developed rapidly at home and abroad. How to efficiently recycle reclaimed asphalt pavement (RAP) has become an urgent problem. One of its main uses is to prepare emulsified asphalt cold recycled mixture. Ho-wever, the old and new asphalt molecules will be re-integrated when the emulsified asphalt and RAP are mixed,which can make the internal interfaces of the cold recycled mixture show diverse fusion characteristics. The internal interface fusion state of the cold recycled mix is closely related to its interface strength and macroscopic properties. Therefore, the interface fusion characteristics of emulsified asphalt and RAP become the focus of research on cold recycled technology for asphalt pavement. The theories of interfacial fusion between emulsified asphalt and RAP rege-neration are summarized based on Fick’s and composite theory in this paper. The cohesion and internal friction resistance of the mixture are influenced by the effect of interfacial fusion between the two phases of emulsified asphalt and RAP, which can in turn affect the interfacial strength. In addition, the interfacial fusion influence law is analyzed from five aspects in this paper:RAP material properties, asphalt component characteristics, external conditions, RAP’s dosage and regenerate. Among them, properties of RAP and external conditions have the most significant impact on recycled asphalt mixtures. The fusion degrees of emulsified asphalt and old asphalt are basically close, but there are some differences at different temperatures. Theoretically, the concentration difference between RAP and emulsified asphalt will promote the fusion of old and new asphalt, but the large asphaltene on RAP surface can prevent the fusion. The tensile strength and rutting resistance of the recycled mix are directly affected by the amount of RAP. The addition of regenerating agent can change the ratio of light and hard asphalt components, and effectively improve the efficiency of interfacial fusion. Finally, the improvement methods of interfacial fusion between emulsified asphalt and RAP are proposed from three aspects of emulsified asphalt, RAP, and two-phase connection, which can provide theoretical and technical basis for future research on interfacial fusion of emulsified asphalt and RAP.
通讯作者:
* 王振军,长安大学材料科学与工程学院教授、博士研究生导师。2007年长安大学公路学院道路与铁道工程专业博士毕业后在长安大学工作至今。目前主要从事道路工程材料、建筑材料等方面的研究工作。发表论文100余篇,包括Cement and Concrete Composites、 Journal of Cleaner Production、Construction and Building Materials、《中国公路学报》《硅酸盐学报》等。zjwang@chd.edu.cn
引用本文:
王振军, 阎凤凤, 张含笑, 梁晴陨. 乳化沥青与RAP再生界面融合特征研究进展[J]. 材料导报, 2023, 37(7): 21030199-10.
WANG Zhenjun, YAN Fengfeng, ZHANG Hanxiao, LIANG Qingyun. Research Progress of Interfacial Fusion Characteristics Between Emulsified Asphalt and RAP. Materials Reports, 2023, 37(7): 21030199-10.
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2023, Vol. 37 
