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| Effect and mechanism of nano-Ca10(PO4)6(OH)2 additive on compressive strength of calcium aluminate cement at high temperature |
| Qian Sun1, En-hui Wang1, Xin-mei Hou1, Zhi-jun He2, Tong-xiang Liang3 |
1 Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
2 School of Material and Metallurgy, University of Science and Technology Liaoning, Anshan 114501, Liaoning, China
3 School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China |
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Abstract Calcium aluminate cement (CAC) is widely used as a binder for refractory materials, and thus the improvement in compressive strength is of vital importance for CAC applied at high temperature. For this purpose, nano-Ca10(PO4)6(OH)2 additive with a ratio of 0.5–1.5 mass% was added with the water-cement ratio to be 0.4. X-ray diffraction and isothermal calorimetry analysis demonstrate that nano-Ca10(PO4)6(OH)2 additive can shorten the hydration process and promote the formation of main hydrates of CaAl2O4·10H2O (CAH10) and Ca2Al2O5·8H2O (C2AH8). In addition, scanning electron microscopy results suggest that nano-Ca10(PO4)6(OH)2 can protect CAH10 and C2AH8 from being destroyed during the calcination, guaranteeing that these thin lamellar crystals are intertwined to form the denser microstructure. Benefited from above effects, nano-Ca10(PO4)6(OH)2 can obviously improve the compressive strength of the CAC mortar samples cured for 7 d after calcination at 1100 °C, while the improving effect is dependent upon its contents. Especially, compared with the one without the additive, the compressive strength of the sample with 1.0% nano-Ca10(PO4)6(OH)2 is increased by 14%.
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Received: 09 January 2021
Published: 25 July 2022
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| Cite this article: |
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Qian Sun,En-hui Wang,Xin-mei Hou, et al. Effect and mechanism of nano-Ca10(PO4)6(OH)2 additive on compressive strength of calcium aluminate cement at high temperature[J]. Journal of Iron and Steel Research International, 2022, 29(7): 1063-1072.
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2022, Vol. 29 
