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High Temperature Concrete / Monolithics For Application In Kiln And Furnace: Role Of Chemistry

DAS, Swapan Kumar (2016) High Temperature Concrete / Monolithics For Application In Kiln And Furnace: Role Of Chemistry. In: Workshop on Fire Hazards: Causes, Prevention and Basic Fire Fighting , 28th June – 1st July, 2016, Covenant University, Ota, Nigeria.

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The conventional high temperature concrete for application in kiln and furnaces is a mixture of refractory aggregate and calcium aluminate cement binder. The CaO-Al2O3 binary equilibrium diagram provides useful information regarding existence of various calcium aluminates, out of which CA(CaO.Al2O3), CA2(CaO.2Al2O3) and C12A7(12CaO.7Al2O3) are considered to be the most important hydraulic phases having wide applications as binder to produce high temperature concretes. In the present study, high temperature concretes were prepared utilizing different types of refractory aggregates and synthetically prepared CA, CA2, C12A7 binders in single or in combination and allowed the samples to undergo hydration at different temperatures and different periods of time. It has been observed that water converts anhydrous calcium aluminates into different hydrated phases and the hydration reaction scheme has been different for each of the calcium aluminates. The major hydraulic phases were identified as CAH10, C2AH8, C3AH6 (C=CaO, H=H2O) which contribute towards strength development. A distinct change in crystal morphology was seen in each individual calcium aluminates and also when they were mixed in certain proportions. The chemistry of refractory aggregate has a considerable influence upon the quality of castable product for high temperature applications in kiln and furnaces. The paper discusses some of these issues. The process of making high temperature concrete utilizing commercially available tabular alumina aggregate, reactive alumina fines and calcium aluminate cement binder will also be demonstrated along with their main testing methods.

Item Type: Conference or Workshop Item (Paper)
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Engineering, Science and Mathematics > School of Chemistry
Depositing User: Mrs Hannah Akinwumi
Date Deposited: 12 Jul 2016 13:21
Last Modified: 12 Jul 2016 13:21

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