Aging Resistance and Microcharacteristics of Asphalt Modified by Biochar from Spent Coffee Grounds
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 9
Abstract
Major global consumption of coffee has led to the generation of a substantial amount of spent coffee grounds (SCG), which contribute to environmental burdens. Research on using SCG for asphalt modification is limited. This study aimed to investigate the effectiveness of using biochar from spent coffee grounds (SBC) produced through low-oxygen pyrolysis as a modifier for asphalt, to enhance high-temperature performance and aging resistance. The results demonstrated excellent compatibility between SBC and asphalt binder without causing agglomeration. The introduction of SBC significantly enhanced asphalt’s high-temperature stability and resistance to deformation, while some adverse effects on low-temperature performance were found. The inclusion of SBC improved the anti-aging properties of asphalt, as indicated by various aging performance indices. A decreasing trend was observed for sulfoxide () . Atomic force microscopy (AFM) images revealed the changes in the size and shape of beelike structures, with smaller bee structures observed in SBC-modified asphalt (SBCMA). Overall, these microscopic structures were consistent with the rheological properties. Due to the improvement of high-temperature stability and anti-aging properties, SBC could prove to be an environmentally friendly and sustainable modifier for asphalt.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors acknowledge the support of the General Program of Natural Science Foundation of Shaanxi Province (2022JM-293) and the Fundamental Research Funds for the Central Universities, CHD (300102213511), in carrying out this research. The authors are thankful to Xinguang Yi (Civil Aviation Flight College of China) and Yihan Sun (Zhejiang Future Transportation Science and Technology Innovation Center), who assisted in conducting asphalt binder testing in the laboratory.
Author contributions: Zheng Chen: Funding acquisition, Supervision, Writing–review and editing. Deliang Yu: Writing–original draft, Software, Data curation, Methodology, Visualization, Conceptualization. Zhengang Feng: Funding support, Supervision.
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 9 • September 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Dec 1, 2023
Accepted: Feb 2, 2024
Published online: Jun 17, 2024
Published in print: Sep 1, 2024
Discussion open until: Nov 17, 2024
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