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Paper Information

Journal:   JOURNAL OF SCHOOL OF ENGINEERING   2004 , Volume 16 , Number 1; Page(s) 53 To 62.
 
Paper: 

INVESTIGATION OF POZZOLANIC BINDERS USING SULFO-CALCIC FLY ASHES

 
 
Author(s):  SADR MOMTAZI A.*
 
* 
 
Abstract: 
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The fly ashes contain mainly quick lime (CaO), anhydrite (CaSo4) and larnite (βCa2SiO4). At ambient temperature and at normal consistency, their hydration leads to the formation of ettringite, slaked lime and gypsum. The crystallization of the ettringite causes quick cracking and splitting of the hydrated products. The ability of sulfo-calcic fly ashes to produce portlandite (Ca(OH)2),led for production of pozzolanic cements. The sulfo-calcic fly ashes are ground, then slaked either in ambient or hydrothermal conditions (2 or 6 hours at 1300c).The rate of hydration is investigated by study of compressive strength and analyses of the products by Differential Thermal Analysis (DTA) and X-Ray Diffraction (XRD) at various hydration times. The results of this research show that sulfo-calcic fly ashes can be used for production of cheap and anti sulfate pozzolanic cements.

 
Keyword(s): POZZOLANIC BINDERS, FLY ASHES, SULFO-CALCIC, SLAKING, GRINDIG, X RAY DIFFRACTION, DIFFERENTIAL THERMAL ANALYSIS
 
References: 
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