Role of phosphogypsum impurities on strength and microstructure of selenite plaster |
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| Affiliation: | 1. Faculty of Materials Science and Chemistry, China University of Geosciences, 430074 Wuhan, PR China;2. Zhejiang Research Institute, China University of Geosciences, 311300 Hangzhou, PR China;3. School of Environmental Studies, China University of Geosciences, 430074 Wuhan, PR China;1. Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing, 211189, China;2. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, China;1. University of Jinan, Jinan 250022, China;2. College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China;3. Yunnan Research Institute of Building Science, Yunnan 650223, China;4. State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China;1. Department of Integrated Sciences, University of Huelva, Campus de Excelencia Internacional del Mar (CEIMAR), 21071 Huelva, Spain;2. Department of Physics, São Paulo State University (UNESP), FCT/DF, Presidente Prudente, São Paulo, Brazil;3. Department of Applied Physics, Escuela de Ingeniería, Puerto Real, 11510 Cádiz, Spain;4. Department of Construction, Instituto de Ciencias de la Construcción Eduardo Torroja (IETcc-CSIC), 28033 Madrid, Spain |
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| Abstract: | The effect of phosphatic, fluoride and organic impurities as present in waste phosphogypsum were studied on the setting time, strength development and microstructure of the selenite gypsum plaster. The results showed that these impurities affect the physical properties of the plaster in a similar fashion as observed in the setting and hardening of the phosphogypsum plaster. The selenite plaster sets fast with a fall in strength. The selenite plaster which normally crystallizes into long interlocking needle shaped crystals has been found to be modified to prismatic, lath, and tabular shaped crystals of variable sizes interspersed with radiating crystals and anhedral to subhedral microcrystallites having irregular boundaries and poor stacking. It is concluded that formation of prismatic and lath-like crystal of different morphology affect the normal setting and strength characteristics of selenite gypsum plaster to a great extent. The effect is more pronounced when soluble phosphatic, fluoride and organic matter were added to the selenite plaster than the sparingly and less soluble compounds intermixed. |
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