Investigation of reclaimed asphalt pavement blending efficiency based on micro-mechanical properties of layered asphalt binders

被引:54
作者
Xu, Jinzhi [1 ]
Hao, Peiwen [1 ]
Zhang, Depeng [2 ]
Yuan, Gaoang [1 ]
机构
[1] Changan Univ, PRC, Minist Commun, Key Lab Rd Struct & Mat, Xian 710064, Shaanxi, Peoples R China
[2] Chong Qing Municipal Inst Design, Yanghe Yicun 69, Chongqing 404100, Peoples R China
基金
中国国家自然科学基金;
关键词
RAP; Blending efficiency; Staged extraction; AFM; Micro-mechanical properties; ATOMIC-FORCE MICROSCOPY; PHASE-SEPARATION; HIGH RAP; MIXTURES; BITUMEN; MICROSTRUCTURE; PERFORMANCE; AGGREGATE;
D O I
10.1016/j.conbuildmat.2017.12.030
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The challenge in mix design and application of reclaimed hot mix asphalt (HMA) lies in the unknown blending efficiency between reclaimed asphalt pavement (RAP) binder and virgin binder. By using a combination of staged extraction method and Atomic Force Microscopy (AFM) imaging technique, this paper focused on the investigation of interaction and extent of blending between RAP-virgin binders under different mixing temperature and residence time, based on the micro-mechanical properties of layered binders in real reclaimed HMA. In addition, the impact of chemical solvent used in staged extraction, i.e. Trichloroethylene (TCE), on the AFM images of extracted asphalt binder was also explored. It was found that the topographic features of asphalt binder in terms of "bees" structure were obviously altered by TCE, which were not suitable for analysis on RAP blending. A possible blending scenario, indicating non-homogenous blending between RAP-virgin binders in the layered binder system, was put forward for the mixing stage of reclaimed HMA, in which increased DMT modulus and decreased adhesion force and energy dissipation were observed from the outermost towards to the innermost layers. Both mixing temperature and residence time have significant effects on the blending efficiency between RAP-virgin binders. With the decrease of mixing temperature, diffusion of the virgin binder into RAP binder is impaired, thus leading to less blending efficiency between the two binders. Besides the mixing process, the blending between RAP-virgin binders continues with the passing residence time, until a complete and homogeneous blending being reached after sufficiently long time. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:390 / 401
页数:12
相关论文
共 37 条
[1]  
Al-Qadi I. L., 2009, EFFICIENT TRANSPORTA
[2]  
Al-Qadi I.L., 2007, Reclaimed Asphalt Pavement - A Literature Review
[3]   The effects of chemical composition on asphalt microstructure and their association to pavement performance [J].
Allen, R. Grover ;
Little, Dallas N. ;
Bhasin, Amit ;
Glover, Charles J. .
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING, 2014, 15 (01) :9-22
[4]   Solvent Effect on the Morphology of the Bee - Structure Observed by Atomic Force Microscopy on Bitumen Sample [J].
Backx, Bianca Pizzorno ;
Simao, Renata Antoun ;
Dourado, Erico Rodrigues ;
Mathias Leite, Leni Figueiredo .
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, 2014, 17 (05) :1157-1161
[5]  
Bowers B.F., 2016, J MAT CIV ENG
[6]   Investigation of Reclaimed Asphalt Pavement blending efficiency through GPC and FTIR [J].
Bowers, Benjamin F. ;
Huang, Baoshan ;
Shu, Xiang ;
Miller, Brad C. .
CONSTRUCTION AND BUILDING MATERIALS, 2014, 50 :517-523
[7]  
Burr B.L., 1991, Transportation Research Record: Journal of the Transportation Research Board, V1323, P70
[8]  
Carpenter S.H., 1980, Transportation Research Record: Journal of the Transportation Research Board, P15
[9]  
Cipione C.A., 1991, Transportation Research Record: Journal of the Transportation Research Board, V1323, P47
[10]   Atomic force microscopy to investigate asphalt binders: a state-of-the-art review [J].
Das, Prabir Kumar ;
Baaj, Hassan ;
Tighe, Susan ;
Kringos, Niki .
ROAD MATERIALS AND PAVEMENT DESIGN, 2016, 17 (03) :693-718