Hydration and Strength Development of Cementitious Materials Prepared with Phosphorous-Bearing Clinkers
1
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China
2
College of Materials and Construction Engineering, Guizhou Normal College, Guiyang 550018, China
3
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
4
Anhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230601, China
*
Authors to whom correspondence should be addressed.
Materials 2021, 14(3), 508; https://doi.org/10.3390/ma14030508
Received: 17 December 2020
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Revised: 11 January 2021
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Accepted: 19 January 2021
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Published: 21 January 2021
(This article belongs to the Special Issue Cementitious Material in Concrete)
To rationally use low-grade phosphorous limestone as the raw materials for cement production, the influence of phosphorous introduced by fluorapatite during the clinker calcination process on the mechanical properties of cementitious materials is investigated. Hydration kinetics, phase evolutions, and microstructure of cement pastes have been studied by using calorimetry, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results indicate that the mechanical properties of cementitious materials can be slightly improved due to the mineralization effect of the small amount of phosphorous in the clinker and significantly decreased with an increase of phosphorous. High content of phosphorous will reduce the content of C3S and make the formation of α′-C2S-xC3P(x: 0–0.05), whose hydration reactivity is rather lower, such that on the one hand less-hydrated products, such as calcium silicate hydrate (C-S-H) gel, can be obtained, and on the other hand, the hydration reaction will be slowed by severely prolonging the induction period. Interestingly, small particles can be observed on the surface of hydration products, but no new phase can be detected by XRD. When the content of P2O5 is 2.0%, the cement can meet the requirements of P·II 42.5 cement in China. Hopefully, this can provide significant guidance for the use of cement prepared by fluorapatite as raw material.
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MDPI and ACS Style
Xie, L.; Deng, M.; Tang, J.; Liu, K. Hydration and Strength Development of Cementitious Materials Prepared with Phosphorous-Bearing Clinkers. Materials 2021, 14, 508. https://doi.org/10.3390/ma14030508
AMA Style
Xie L, Deng M, Tang J, Liu K. Hydration and Strength Development of Cementitious Materials Prepared with Phosphorous-Bearing Clinkers. Materials. 2021; 14(3):508. https://doi.org/10.3390/ma14030508
Chicago/Turabian StyleXie, Lilan, Min Deng, Jinhui Tang, and Kaiwei Liu. 2021. "Hydration and Strength Development of Cementitious Materials Prepared with Phosphorous-Bearing Clinkers" Materials 14, no. 3: 508. https://doi.org/10.3390/ma14030508
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