乳化沥青与RAP再生界面融合特征研究进展

doi:10.11896/cldb.21030199

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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.

Key words： emulsified asphalt reclaimed asphalt pavement (RAP) interface fusion characteristic evaluation parameters of regeneration fusion influencing factor

Published: 10 April 2023 Online: 2023-04-07

CLC number:

TB302

Fund:National Natural Science Foundation of China (51978067), and Science and Technology Development Project of Xinjiang Production and Construction Corps ( 2019AB013).

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	WANG Zhenjun
	YAN Fengfeng
	ZHANG Hanxiao
	LIANG Qingyun

Cite this article:

WANG Zhenjun,YAN Fengfeng,ZHANG Hanxiao, et al. Research Progress of Interfacial Fusion Characteristics Between Emulsified Asphalt and RAP[J]. Materials Reports, 2023, 37(7): 21030199-10.

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http://www.mater-rep.com/EN/10.11896/cldb.21030199 OR http://www.mater-rep.com/EN/Y2023/V37/I7/21030199

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