Studies on the Thermal-Physical Treatment of Waste Concrete for Use in Lightweight Aggregate Concrete
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 12
Abstract
Demolition of buildings can generate large amounts of waste concrete, which if used effectively, can help reduce both the extraction of raw materials and carbon emissions. However, the presence of old cement mortar affects the effective use of waste concrete as a recycled fine aggregates. This study aims to remove old mortar adhering to the surface of waste concrete coarse aggregates via thermal-physical treatment. This study involves assessing the thermal-physical treatment technology and comparing the performance of recycled fine aggregates prepared using this technology with that of fully recycled fine aggregates. The results of this study illustrate the effect of the thermal-physical treatment technique on the preparation of recycled fine aggregates from waste concrete and the effect of fully recycled fine aggregates and recycled fine aggregates prepared using this technique on ceramsite concrete. The results revealed that the thermal-physical treatment technology has a positive effect in improving the quality of recycled fine aggregates prepared via the thermal-physical treatment technique. This technique helps to significantly improve the compressive strength, ultrasonic velocity, resistance to sulfate attack, and microstructure of the recycled ceramsite concrete compared with the fully recycled fine aggregate.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research was funded by the project of the Natural Science Foundation of Chongqing municipality (cstc2021jcyj-msxmX0444), as well as the project of Chongqing Construction science and Technology Plan (2021 No. 1-6) and the project of Chongqing Bureau of Human Resources and Social Security (cx2020008). This study was also supported by the open fund of Chongqing Key Laboratory of Energy Engineering Mechanics and Disaster Prevention and Reduction (EEMDPM2021103), and the fund of State Key Laboratory of Bridge Engineering Structural Dynamics, Key Laboratory of Bridge Earthquake Resistance Technology, Ministry of Communications, PRC. Project was also supported by the scientific and technological research program of Chongqing Municipal Education Commission (KJZD-K202201503).
Author contributions: Changming Bu contributed to the conceptualization, validation, and project administration. Lei Liu contributed to the writing (review and editing) and visualization. Qiutong Wu contributed to the formal analysis and data curation. Yi Sun contributed to the writing (original draft preparation) and formal analysis. Mingtao Zhang contributed to the software and funding acquisition. Jianchuan Zhan contributed to the methodology and supervision. Wentao Zhang contributed to the resources and funding acquisition.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 12 • December 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Aug 3, 2022
Accepted: Mar 30, 2023
Published online: Sep 25, 2023
Published in print: Dec 1, 2023
Discussion open until: Feb 25, 2024
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