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Fire resistance of fired clay bricks-fly ash composite cement pastes
Faculty
Science
Year:
2012
Type of Publication:
Article
Pages:
201-209
Authors:
Osman, Randa M, El-Didamony, Hamdy, Abd El-Rahman, Enas
DOI:
10.1016/j.ceramint.2011.06.050
Journal:
CERAMICS INTERNATIONAL ELSEVIER SCI LTD
Volume:
38
Research Area:
Materials Science
ISSN
ISI:000298766900027
Keywords :
Ground clay brick, Fly ash, Kinetic hydration, Heat-treatment, Phase composition
Abstract:
This work aims to study the effect of substitution of fly ash for homra on the hydration properties of composite cement pastes. The composite cements are composed of constant proportion of OPC (80\%) with variable amounts of fly ash and homra. The addition of fly ash accelerates the initial and final sitting time, whereas the free lime and combined water contents decrease with fly ash content. The fly ash acts as nucleation sites which may accelerate the rate of formation of hydration products which fill some of the pores of the cement pastes. The fire resistance of composite cement pastes was evaluated after firing at 250, 450, 600, 800 degrees C with rate of firing 5 degrees C/min with soaking time for 2 h. The physico-mechanical properties such as bulk density and compressive strength were determined at each firing temperature. Moreover, the phase composition, free lime and microstructure for some selected samples were investigated. It can be concluded that the pozzolanic cement with 20 wt\% fly ash can be used as fire resisting cement. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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