Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 190, Issue -, Pages 53-64Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.09.095
Keywords
Hemihydrate phosphogypsum plaster; Alkali; Setting time; Strength; Hydration
Categories
Funding
- National Natural Science Foundation of China [51578141]
- Ministry of Science and Technology of China [2016YFE0118200]
- Major State Basic Research Development Program of China [2015CB6551002]
- National Natural Science Foundation, Major State Basic Research Development Program of China
- National Natural Science Foundation, Major State Basic Research Development Technology of China
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Phosphogypsum (PG) which is a waste byproduct of fertilizer production is the promising source of the gypsum industry. In order to explore the application of hemihydrate PG (HPG) as a substitute of hemihydrate gypsum, the setting and hardening characters of HPG plaster at different pH after neutralization were examined and contrasted with hemihydrate flue gas desulfurization gypsum (HFGD) plaster. Results showed that HPG plaster sets slow with a fall in strength and this effect was more pronounced after retarders were added when pH increased from 5.85 to 11.08. By contrast, HFGD plaster sets fast and without strength variation in the similar alkaline range. Microscopic studies including chemically combined water and temperature evolution curves of HPG plaster revealed that with the increase of the pH, the hydration reaction mechanism of hemihydrate and the gypsum crystal morphology were radically changed due to the fact of interaction between impurities and alkali. Consequently, HPG plaster is very different from HFGD plaster and its application in the alkaline condition was restricted. (C) 2018 Published by Elsevier Ltd.
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