Effects of components on the rate of heat liberation of the hydration in the system of glass/gypsum/lime

Slag-simulated glasses in the system of CaO–Al 2O 3–SiO 2 were prepared. Their rates of heat liberation were measured in the system with gypsum and lime, especially in the excess gypsum system. They have a period with constant rate of heat liberation. These rates depend on the components of the glas...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2006, Vol.26 (4), p.771-776
Main Authors: Goto, Seishi, Fujimori, Hirotaka, Hidaka, Atsushi, Ioku, Koji
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
CaO–Al 2O 3–SiO 2 glass
Chemical industry and chemicals
Chemical properties
Exact sciences and technology
Glasses
Manufacture
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Summary:Slag-simulated glasses in the system of CaO–Al 2O 3–SiO 2 were prepared. Their rates of heat liberation were measured in the system with gypsum and lime, especially in the excess gypsum system. They have a period with constant rate of heat liberation. These rates depend on the components of the glass. The effects of the components on the rate of heat liberation were discussed. The rates of constant heat liberation depend on the composition of glass especially the contents of CaO and Al 2O 3. The period of this process was controlled by the amount of lime addition. During this stage, the solid Ca(OH) 2 was completely consumed. In this sulfate-excess system, the reaction equation, during Ca(OH) 2 consumption, should be written as; glass + gypsum + lime ⇒ C–S–H with a C/S ratio of 1.42 and Ettringite.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2005.07.053