| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Properties and Microstructure of Dihydrate Phosphogypsum-Calcium Carbide Slag-Ferronickel Slag Ternary System |
| MA Mengyang1,2, HE Xingyang3,4,*, XIONG Guang3, LI Xinmao3, LONG Yong1,2, WANG Fulong5
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1 State Key Laboratory for Health and Safety of Bridge Structures, Wuhan 430034, China
2 China Railway Bridge Science Research Institute., Ltd, Wuhan 430034, China
3 School of Civil Engineering and Environmental Sciences, Hubei University of Technology, Wuhan 430068, China
4 Building Waterproof Engineering and Technology Research Center of Hubei Province, Hubei University of Technology, Wuhan 430068, China
5 China Construction Seventh Engineering Division Corp., Ltd, Zhengzhou 450000, China |
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Abstract A total solid waste ternary cementing system was prepared by dihydrate phosphogypsum-calcium carbide slag-ferronickel slag. The effect of calcium carbide slag and dihydrate phosphogypsum on the performance of the ternary system was studied. The hydration products, microstructure and elemental composition of the system were analyzed by X-ray diffraction and scanning electron microscopy. The results showed that both dihydrate phosphogypsum and calcium carbide slag could decrease the fluidity of the ternary system. Due to the influence of retarding components such as phosphorus and fluorine in dihydrate phosphogypsum, the setting time of the ternary system was greatly prolonged, and the 3 d compressive strength also decreases, but addition of dihydrate phosphogypsum was conducive to the later strength growth. The incorporation of calcium carbide slag shortens the setting time of ternary system, but reduces the compressive strength of the system. The hydration products of ternary system were mainly C-A-S-H gel and ettringite. The ternary system showed a high expansion rate, but the volume change tended to be stable after 2 d. The enrichment of calcium hydroxide and expansion cracks in the interfacial transition zone leaded to the decrease of the bonding force between aggregates and gels under the condition of high calcium carbide slag content, resulting in the decrease of strength.
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Published: 10 July 2024
Online: 2024-08-01
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| Fund:Major Technical Innovation Project in Hubei Province of China (2021BGD014). |
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2024, Vol. 38 
