| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Early-age Hydration and Microstructure of Phosphoric Acid Modified Steel Slag Powder Blended Portlandite Pastes |
| HUO Binbin1,2,CHEN Chun1, ZHANG Yamei1,*
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1 Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
2 State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China |
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Abstract Aiming to investigate the early-age hydration ability change ofphosphoric acid (PA) modified steel slag powder (SS) under alkaline cement environment, the hydration heat evolution, hydrates, and microstructure of the phosphoric acid modified SS (SSPA) and unmodified SS blended portlandite pastes were compared in this investigation. It is found that compared to SS blended portlandite pastes, the heat release peak of SSPA blended portlandite paste moves forward and accompanies with higher heat release value, resulting in an improvement of 16.8% in 72 h cumulative hydration heat. Additionally, SSPA blended portlandite paste consumes more content of portlandite at 3 d, 7 d and 28 d, produces less pore and more hydrates. While due to the retard effect of PO43- to the active calcium silicates, the decreased porosity in SSPA blended portlandite pastes from 3 d to 28 d is lower than that of the SS blended portlandite pastes.
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Published: 10 August 2023
Online: 2023-08-07
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| Fund:National Natural Science Foundation of China (51778132, 51972057). |
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2023, Vol. 37 
