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Comparative effect of additives on the mechanical properties of plasters made from flue-gas desulfurized and natural gypsums



Title: Comparative effect of additives on the mechanical properties of plasters made from flue-gas desulfurized and natural gypsums
Author(s): W. Prakaypun, S. Jinawath
Paper category : journal
Serial title: Materials and Structures
Abreviated Serial title: Mater. Struct.
ISSN: 1359-5997
Publisher: RILEM Publications SARL
Volume: 36
Issue: 255
Issue date: 2003-01-01
Publication year: 2003
Pages: 51 - 58
Total Pages: 8
Nb references: 6
Language: English


Abstract: Gypsum produced by flue-gas desulfurization (FGD gypsum)from the Mae Moh power plant,Thailand,was precleaned,characterized and used as the starting material for the preparations of ß -hemihydrate (ß -HH)and multiphase plasters with compositions within the three-phase composition diagram of calcined gypsum [1 ].
Based on performance requirements of commercial products,the plasters obtained were fabricated into gypsum board specimens using various additives as set regulators.
The effect of the additives on the morphology and mechanical properties of the set plasters was studied in comparison with those from natural gypsum.
With the exception of calcium sulfate dihydrate,it was found that additives caused a characteristic change in structure with a trend towards reduction of the aspect ratio of the hydrate crystals,as well as a decrease in strength.
The set plasters obtained from FGD gypsum had higher strengths due to the finer crystal size of the hydrate.


Online publication: 2002-11-27
Classification: Technical Reports
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/13769


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