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Using Fly Ash Wastes for the Development of New Building Materials with Improved Compressive Strength

Fly ash wastes (silica, aluminum and iron-rich materials) could be smartly valorized by their incorporation in concrete formulation, partly replacing the cement. The necessary binding properties can be accomplished by a simple procedure: an alkali activation process, involving partial hydrolysis, fo...

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Autores principales: Harja, Maria, Teodosiu, Carmen, Isopescu, Dorina Nicolina, Gencel, Osman, Lutic, Doina, Ciobanu, Gabriela, Cretescu, Igor
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8781902/
https://www.ncbi.nlm.nih.gov/pubmed/35057360
http://dx.doi.org/10.3390/ma15020644
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author Harja, Maria
Teodosiu, Carmen
Isopescu, Dorina Nicolina
Gencel, Osman
Lutic, Doina
Ciobanu, Gabriela
Cretescu, Igor
author_facet Harja, Maria
Teodosiu, Carmen
Isopescu, Dorina Nicolina
Gencel, Osman
Lutic, Doina
Ciobanu, Gabriela
Cretescu, Igor
author_sort Harja, Maria
collection PubMed
description Fly ash wastes (silica, aluminum and iron-rich materials) could be smartly valorized by their incorporation in concrete formulation, partly replacing the cement. The necessary binding properties can be accomplished by a simple procedure: an alkali activation process, involving partial hydrolysis, followed by gel formation and polycondensation. The correlations between the experimental fly ash processing conditions, particle characteristics (size and morphology) and the compressive strength values of the concrete prepared using this material were investigated by performing a parametric optimization study to deduce the optimal processing set of conditions. The alkali activation procedure included the variation of the NaOH solutions concentration (8–12 M), temperature values (25–65 °C) and the liquid/solid ratio (1–3). The activation led to important modifications of the crystallography of the samples (shown by powder XRD analysis), their morphologies (seen by SEM), particle size distribution and Blaine surface values. The values of the compressive strength of concrete prepared using fly ash derivatives were between 16.8–22.6 MPa. Thus, the processed fly ash qualifies as a proper potential building material, solving disposal-associated problems, as well as saving significant amounts of cement consumed in concrete formulation.
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spelling pubmed-87819022022-01-22 Using Fly Ash Wastes for the Development of New Building Materials with Improved Compressive Strength Harja, Maria Teodosiu, Carmen Isopescu, Dorina Nicolina Gencel, Osman Lutic, Doina Ciobanu, Gabriela Cretescu, Igor Materials (Basel) Article Fly ash wastes (silica, aluminum and iron-rich materials) could be smartly valorized by their incorporation in concrete formulation, partly replacing the cement. The necessary binding properties can be accomplished by a simple procedure: an alkali activation process, involving partial hydrolysis, followed by gel formation and polycondensation. The correlations between the experimental fly ash processing conditions, particle characteristics (size and morphology) and the compressive strength values of the concrete prepared using this material were investigated by performing a parametric optimization study to deduce the optimal processing set of conditions. The alkali activation procedure included the variation of the NaOH solutions concentration (8–12 M), temperature values (25–65 °C) and the liquid/solid ratio (1–3). The activation led to important modifications of the crystallography of the samples (shown by powder XRD analysis), their morphologies (seen by SEM), particle size distribution and Blaine surface values. The values of the compressive strength of concrete prepared using fly ash derivatives were between 16.8–22.6 MPa. Thus, the processed fly ash qualifies as a proper potential building material, solving disposal-associated problems, as well as saving significant amounts of cement consumed in concrete formulation. MDPI 2022-01-15 /pmc/articles/PMC8781902/ /pubmed/35057360 http://dx.doi.org/10.3390/ma15020644 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Harja, Maria
Teodosiu, Carmen
Isopescu, Dorina Nicolina
Gencel, Osman
Lutic, Doina
Ciobanu, Gabriela
Cretescu, Igor
Using Fly Ash Wastes for the Development of New Building Materials with Improved Compressive Strength
title Using Fly Ash Wastes for the Development of New Building Materials with Improved Compressive Strength
title_full Using Fly Ash Wastes for the Development of New Building Materials with Improved Compressive Strength
title_fullStr Using Fly Ash Wastes for the Development of New Building Materials with Improved Compressive Strength
title_full_unstemmed Using Fly Ash Wastes for the Development of New Building Materials with Improved Compressive Strength
title_short Using Fly Ash Wastes for the Development of New Building Materials with Improved Compressive Strength
title_sort using fly ash wastes for the development of new building materials with improved compressive strength
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8781902/
https://www.ncbi.nlm.nih.gov/pubmed/35057360
http://dx.doi.org/10.3390/ma15020644
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