Thermal stability of limestone calcined clay cement (LC3) at moderate temperatures 100–400 °C
Article
Article Title | Thermal stability of limestone calcined clay cement (LC3) at moderate temperatures 100–400 °C |
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ERA Journal ID | 21082 |
Article Category | Article |
Authors | Cao, Yubin, Wang, Yanru, Zhang, Zuhu, Ma, Yuwei and Wang, Hao |
Journal Title | Cement and Concrete Composites |
Journal Citation | 135, pp. 1-15 |
Article Number | 104832 |
Number of Pages | 15 |
Year | 2023 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 0958-9465 |
1873-393X | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.cemconcomp.2022.104832 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0958946522004255 |
Abstract | The mechanical properties, phase evolution, microstructure development and (re)hydration properties of limestone calcined clay cement (LC3) paste and mortar were investigated to understand their thermal stability under moderate temperatures (100–400 °C). The residual compressive strengths of LC3 and Portland cement (PC) mortars kept constant or slightly increased from ambient to 300 °C, and sharply dropped at 400 °C. At 100 °C, monocarboaluminate (Mc) and ettringite (AFt) converted into hemicarboaluminate (Hc) and monosulfate (Ms), and caused partial dehydroxylation of C-(A)-S-H. As the temperature increased, at 200–300 °C, due to the decomposition of large fraction of hydration products, macroscopic cracks and microstructure damage occurred. At 400 °C, the mean chain length (MCL) of C-(A)-S-H gel decreased, accompanied by the shift of Si and Al-coordination number and the formation of active sites. Under water saturation conditions, the microstructure showed self-repairing performance. |
Keywords | C-(A)-S-H; Hydration products; LC 3; Microstructure; Temperature |
ANZSRC Field of Research 2020 | 401602. Composite and hybrid materials |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Funder | National Natural Science Foundation of China |
Byline Affiliations | Centre for Future Materials |
Hunan University, China | |
Tongji University, China | |
Guangzhou University, China |
https://research.usq.edu.au/item/yy3yv/thermal-stability-of-limestone-calcined-clay-cement-lc3-at-moderate-temperatures-100-400-c
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