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Critical considerations and effective assessment of extraction and recovery processes of RAP

Zhong, Haobai; Huang, Weidong; Lin, Peng; Zhou, Lu; Lv, Quan

Authors

Haobai Zhong

Weidong Huang

Peng Lin

Quan Lv



Abstract

With the increasing shortage of resources, the reuse of recycled asphalt pavements (RAP) in pavement engineering is considered as a sustainable technology. Challenges posed by common extraction and recovery methods may result in misjudgment of asphalt pavement performance. In this study, we investigate the optimization of extraction and recovery processes in recycled asphalt pavement (RAP) recycling, aiming to promote sustainable development within the pavement engineering sector. We prepared eleven asphalt samples to simulate common extraction and recovery scenarios, using virgin SBS-modified asphalt as a reference. Employing Fourier Transform Infrared (FTIR) analysis, thermogravimetric analysis (TGA), and Dynamic Shear Rheometer (DSR) testing, we assessed the samples' rheological and chemical properties. We pointed out three common but easily overlooked problems in the extraction and recovery process, namely residual mineral powder, residual trichloroethylene, and incomplete extraction. Residual mineral powder and trichloroethylene greatly influence extraction recovery accuracy; high-speed centrifugation effectively addresses trichloroethylene, but completely removing mineral powder remains challenging. Accurate evaluation of residual substances in recycled asphalt is achievable through FTIR, TGA, and rheological tests, providing valuable insights for material selection and processing. Additionally, it is crucial to fully recover the binder from RAP for precise performance evaluation, as the binder's interior exhibits lower aging levels compared to the surface. This aging heterogeneity should be considered when assessing RAP performance and developing effective rehabilitation strategies. Our findings hold significant implications for enhancing the efficiency and effectiveness of extraction and recovery processes in RAP recycling, ultimately contributing to sustainable development in pavement engineering.

Journal Article Type Article
Acceptance Date Aug 23, 2023
Online Publication Date Aug 28, 2023
Publication Date 2023-11
Deposit Date Jun 14, 2024
Journal Construction and Building Materials
Print ISSN 0950-0618
Electronic ISSN 1879-0526
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 403
Article Number 133039
DOI https://doi.org/10.1016/j.conbuildmat.2023.133039
Public URL https://nottingham-repository.worktribe.com/output/36016278
Publisher URL https://www.sciencedirect.com/science/article/pii/S0950061823027563?via%3Dihub
Additional Information This article is maintained by: Elsevier; Article Title: Critical considerations and effective assessment of extraction and recovery processes of RAP; Journal Title: Construction and Building Materials; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.conbuildmat.2023.133039; Content Type: article; Copyright: © 2023 The Author(s). Published by Elsevier Ltd.