乳化沥青与RAP再生界面融合特征研究进展  

Research Progress of Interfacial Fusion Characteristics Between Emulsified Asphalt and RAP

作　　者：王振军[1,2] 阎凤凤 张含笑 梁晴陨 WANG Zhenjun;YAN Fengfeng;ZHANG Hanxiao;LIANG Qingyun(School of Materials Science and Engineering,Chang’an University,Xi’an 710061,China;Engineering Research Center of Pavement Materials,Ministry of Education of P.R.China,Xi’an 710064,China)

机构地区：[1]长安大学材料科学与工程学院,西安710061 [2]交通铺面材料教育部工程研究中心,西安710064

出　　处：《材料导报》2023年第7期57-66,共10页Materials Reports

基　　金：国家自然科学基金(51978067);新疆生产建设兵团重点科技攻关项目(2019AB013)。

摘　　要：近年来,国内外沥青路面再生技术发展迅速,如何高效循环利用沥青路面再生材料(RAP)成为亟待解决的问题,将RAP用于制备乳化沥青冷再生混合料便是其主要用途之一。然而,当乳化沥青和RAP混合时,新旧沥青分子会重新融合,使冷再生混合料内部界面呈现多样的融合特征。冷再生混合料内部界面融合状态与其界面强度和宏观性能密切相关,因此,揭示乳化沥青与RAP界面融合特征是沥青路面冷再生技术研究的重点。本文基于Fick理论和复合理论对乳化沥青与RAP再生界面融合理论进行了归纳总结。乳化沥青与RAP两相界面融合效果会影响混合料内聚力和内摩阻力,进而影响界面强度。另外,本文从RAP材料性质、沥青组分特征、外界条件、RAP掺量以及再生剂五个方面分析了界面融合影响规律,其中,RAP材料性质和外界条件对再生沥青混合料的影响最显著;乳化沥青对旧沥青的融合程度和旧沥青对乳化沥青的融合程度基本接近,但在不同的温度下有一些差异;理论上,RAP与乳化沥青接触时两端浓度差会促进新旧沥青融合,但RAP表面的大分子沥青质会阻止其融合;RAP掺量直接影响再生混合料的抗拉强度和抗车辙能力;加入再生剂可以改变沥青轻质组分和硬质组分比例,有效提高界面融合效率。最后,提出乳化沥青与RAP界面融合改善可以从乳化沥青、RAP和两相连接三方面考虑,以期为未来乳化沥青和RAP界面融合研究提供理论和技术基础。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 impro

关 键 词：乳化沥青 沥青路面再生材料(RAP) 界面融合特征 再生融合评价参数 影响因素 

分 类 号：TB302[一般工业技术—材料科学与工程]