Spray Dryer Ash from Thermoelectric Power Plants as Civil Construction Materials
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 2
Abstract
Installing flue gas desulphurization systems before particulate collectors in thermoelectric plants generates spray dryer ash (SDA), a mixture of fly ash and sulfur products. SDA carries a large environmental liability, and research to exploit this waste is still incipient. An alternative use for SDA is as raw material for civil construction. Therefore, the objective of this article is to verify the feasibility of replacing hydrated lime with SDA in rendering mortars for façades, and using SDA as a mineral addition to concrete. For this, mortar mixes with 0%, 33%, 67%, and 100% SDA replacement contents were prepared, and tests in fresh and hard states performed. For concrete, mixes with 0%, 5%, 10%, and 20% of SDA added to the cement mass were prepared, and mechanical and durability tests performed. Results show that mortar consistency tends to increase with SDA content, decreasing its workability. Mechanical and durability properties are equal to or higher than those of the reference mix, both in concrete and mortar. Also, mortar with 67% of SDA performs the best.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors wish to express their thanks to Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico (FUNCAP), for its financial support to the first author during the research; to Central Analítica-UFC/CT-INFRA/MCTI-SISNANO/Pró-Equipamentos CAPES, for generating the SEM images from the SDA in the study; to UFC’s X-Ray Laboratory and to Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq (Processo: 402561/2007-4), Edital MCT/CNPq n° 10/2007, for XRF and XRD analysis of the SDA; and to Convênio N°01/2017 between Energias de Portugal (EDP) and UFC, with the intervention of FUNDAÇÃO ASTEF.
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Journal of Materials in Civil Engineering
Volume 34 • Issue 2 • February 2022
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© 2021 American Society of Civil Engineers.
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Received: Sep 28, 2020
Accepted: Jun 3, 2021
Published online: Nov 17, 2021
Published in print: Feb 1, 2022
Discussion open until: Apr 17, 2022
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