[1] Wu Jiantao, Qiu Lei, Jiao Yan, Liu Quan, et al. Identification and analysis of mixing-induced homogeneity in reclaimed asphalt pavement materials [J]. Journal of Southeast University (English Edition), 2024, 40 (2): 193-202. [doi:10.3969/j.issn.1003-7985.2024.02.010]

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Identification and analysis of mixing-induced homogeneity in reclaimed asphalt pavement materials()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

40

Issue:

2024 2

Page:

193-202

Research Field:

Traffic and Transportation Engineering

Publishing date:

2024-06-13

Info

Title:

Identification and analysis of mixing-induced homogeneity in reclaimed asphalt pavement materials

Author(s):

Wu Jiantao¹;  Qiu Lei¹;  Jiao Yan²;  Liu Quan¹;  Jing Chao³;  Zhu Jinlong⁴

¹College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China
²Hebei Transportation Planning and Design Research Institute Co., Shijiazhuang 050000, China
³Hebei Province Engineering Research Center for Harmless Synergistic Treatment andRecycling of Municipal Solid Waste, Yanshan University, Qinhuangdao 066000, China
⁴Shanghai City Construction Municipal(Engineering)Group Co., Shanghai 200131, China

Keywords:

reclaimed asphalt pavement(RAP);  mixing-induced homogeneity;  image segmentation;  homogeneity index

PACS:

U416.26

DOI:

10.3969/j.issn.1003-7985.2024.02.010

Abstract:

Asphalt mixtures were prepared in the laboratory using reclaimed asphalt pavement(RAP)at a 40% mass concentration to investigate the homogeneity characteristics of RAP during the mixing process, taking into account the mixing duration and aging rate. Specifically, titanium dioxide powder was incorporated into RAP binders as an identification tracer. Homogeneity indices were subsequently established to evaluate the homogeneity characteristics of asphalt mixtures. Computed tomography(CT)was used to create digital images of asphalt mixtures, and Mimics software was used to identify the components. Finally, a homogeneity evaluation system was established to assess the uniformity of both the components and RAP agglomerates. The results indicate that homogeneity is mostly influenced by the distribution of coarse aggregates, followed by asphalt binders and air voids. Homogeneity improvement is hindered by the formation of new agglomerates during the mixing process, whereas it is increased by prolonging the mixing time. A homogeneity evaluation system based on components and agglomerates can effectively reveal the principles governing homogeneity characteristics and provide a reference for the construction of high-quality recycled asphalt pavement.

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Memo

Memo:

Biography: Wu Jiantao(1981—), male, doctor, professor, jiantao.wu@hhu.edu.cn.
Foundation items: The National Science Foundation of China(No. 52078190), the Natural Science Foundation of Jiangsu Province(No. BK20221501), the Natural Science Youth Fund of Jiangsu Province(No. BK20220983), the Natural Science Foundation of Hebei Province(No. E2019203559).
Citation: Wu Jiantao, Qiu Lei, Jiao Yan, et al. Identification and analysis of mixing-induced homogeneity in reclaimed asphalt pavement materials[J].Journal of Southeast University(English Edition), 2024, 40(2):193-202.DOI:10.3969/j.issn.1003-7985.2024.02.010.

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