Assessment of Pozzolanicity of Clay Bricks Fired at Different Temperatures for Use in Repair Mortar
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 8
Abstract
Crushed bricks used in air lime mortars must show pozzolanic activity to obtain hydraulic products, and peak firing temperature is one of the main parameters for pozzolanicity of the fired clay bricks apart from clay type. In this study, solid clay mortars containing impurities as found in nature, which are used in the production of commercially sold bricks, were pulverized for a uniform firing process and then fired at nine different temperatures. The pozzolanic activity of the fired, pulverized clay was examined by commonly used direct and indirect test methods, and the results were discussed. Phase transformations of the clay and the reactions corresponding to temperature changes were also examined by X-ray diffraction (XRD) and thermogravimetric (TG) analyses. The common result of the methods reveals that clay treated at 850°C can be regarded as the best pozzolan, and the pozzolanicity of clay bricks significantly changes the mechanical properties of crushed brick-lime mortars.
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Acknowledgments
This work was supported by research grants of The Scientific and Technological Research Council of Turkey (Project No. 111M568). The authors thank Yıldız Technical University Research Foundation for financial support (Project No. 2011-05-01-DOP01) and Işıklar Building Materials Inc. for supplying the clay mortars.
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 8 • August 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jul 20, 2015
Accepted: Dec 1, 2015
Published online: Feb 29, 2016
Discussion open until: Jul 29, 2016
Published in print: Aug 1, 2016
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