Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 172, Issue -, Pages 597-607Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.04.005
Keywords
Magnesium residue; Magnesium oxysulfate cement; Strength; Calcination temperature; Seed crystal
Categories
Funding
- National Natural Science Foundations of China [51662035]
- Science and technology basic condition platform of Qinghai Province [2018-ZJ-T01]
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Low-cost magnesium oxysulfate (MOS) cement was prepared using magnesia derived from the calcination of magnesium-residue from the production of LiCO3 from salt lake brine. Setting time, mechanical strength, hydration mechanism, hydration products and microstructure of this MOS cement were determined. MOS cement prepared with magnesia after calcination at low temperatures and high molar ratio of a-MgO/MgSO4 was found to harden rapidly but the later-stage strength decreased. However, partial replacement of magnesia obtained from the calcination of magnesium-rich residues by pure light burned magnesia and addition of 5.1.7 phase seed crystals are viable strategies for obtaining MOS cement with improved properties. (C) 2018 Elsevier Ltd. All rights reserved.
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