Utilization of Carbide Slag in Autoclaved Aerated Concrete Preparation
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 12
Abstract
Lime is one of the main raw materials necessary for the production of autoclaved aerated concrete (AAC). The preparation of lime by calcining limestone directly and indirectly emits a large amount of due to the limestone decomposition and energy consumption. In this study, AAC was made using modified carbide slag (MCS) instead of lime, which effectively can utilize solid wastes and reduce the emission. Results showed that in the first 2 h of hydration, the heat release rate of MCS was higher than that of lime, and the cumulative hydration heat of lime and MCS within 30 h was 206.1 and , respectively. MCS not only can improve the fluidity of slurry, but also can enhance the gas-foaming rate. Cumulative pore volume increased with the increase of MCS content in AAC. Tobermorite, quartz, katoite, anhydrite, and calcite were the main minerals in the AAC. With the increase of MCS content, the density and strength of AAC decreased and the thermal insulation performance increased. When the MCS content was 100%, the AAC density was , the compressive strength was 3.6 MPa, and the thermal conductivity was , which meet in the requirements of the Chinese standard.
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Data Availability Statement
No data, models, or code were generated or used during the study.
Acknowledgments
This work was supported by the Student Innovation Fund Project of Southwest University of Science and Technology (JZ22-005) and the Sichuan Science and Technology Program (22NSFSC2451 and 2019ZDZX0024). The authors thank Shu Xiang from Shiyanjia Lab (www.shiyanjia.com) for the language editing service. All experiments were in accordance with the current Chinese legislation.
Author contributions: Yuan Bai: writing (reviewing), methodology, project administration, and editing; Kai Luo: methodology, project administration, writing (original draft), and writing (reviewing and editing); Ke Peng: investigation and software; Jun Li: data curation, investigation, and writing (reviewing and editing); Zhongyuan Lu: conceptualization and investigation; and Jun Jiang: supervision and investigation.
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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: Oct 13, 2022
Accepted: Apr 27, 2023
Published online: Sep 27, 2023
Published in print: Dec 1, 2023
Discussion open until: Feb 27, 2024
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