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Paper Information

Journal:   IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY   Spring-Summer 2004 , Volume 12 , Number 1; Page(s) 31 To 38.
 
Paper: 

PREPARATION OF DIFFERENT PHASES OF HEMIHYDRATE FROM ALAMOUT NATURAL GYPSUM AND STUDY OF EFFECTIVE PARAMETERS ON SETTING TIME

 
 
Author(s):  GHAMMAMI S.*, TAHERI MARYAM
 
* Department of Chemistry, Faculty of science, Imam Khomeini International University, Qazvin, Iran
 
Abstract: 
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In this research the and β phases of hemihydrates have been prepared from Alamout natural gypsum and their setting times have been measured. The IR spectroscopy has been used for characterization of α and β phases of hemihydrates from gypsum. The α and β phases of hemihydrates distinguished from each other by X-ray powder diffraction (XRD). The setting times of pure α and β phases and mixtures of them have been measured by Vicat method. The effects of various additives such as accelerators (NaCl, K2S04, Na2S04) have been studied on setting time. Among them, potassium sulfate had maximum accelerating effect. Optimum concentration of the additive has been determined. This amount is %3 w/w. Less and more than this amount have inverse effects on setting time.

 
Keyword(s): GYPSUM, HEMIHYDRATE, PHASES, PREPARATION, SETTING TIME, ADDITIVES
 
References: 
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  Persian Abstract Yearly Visit 68
 
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