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Long-Term Strength Development of Fly Ash-Based One-Part Alkali-Activated Binders

This research aims to study the effect of the dosage of anhydrous sodium metasilicate activator on the long-term properties of fly ash-based one-part alkali-activated binders (OPAAB) cured at ambient conditions. Powdered sodium metasilicate activator was utilized in the range of 8–16% by weight of t...

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Autores principales: Haruna, Sani, Mohammed, Bashar S., Wahab, Mohamed Mubarak A., Kankia, Mubarak Usman, Amran, Mugahed, Gora, Abdurra’uf Mukhtar
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8348381/
https://www.ncbi.nlm.nih.gov/pubmed/34361355
http://dx.doi.org/10.3390/ma14154160
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author Haruna, Sani
Mohammed, Bashar S.
Wahab, Mohamed Mubarak A.
Kankia, Mubarak Usman
Amran, Mugahed
Gora, Abdurra’uf Mukhtar
author_facet Haruna, Sani
Mohammed, Bashar S.
Wahab, Mohamed Mubarak A.
Kankia, Mubarak Usman
Amran, Mugahed
Gora, Abdurra’uf Mukhtar
author_sort Haruna, Sani
collection PubMed
description This research aims to study the effect of the dosage of anhydrous sodium metasilicate activator on the long-term properties of fly ash-based one-part alkali-activated binders (OPAAB) cured at ambient conditions. Powdered sodium metasilicate activator was utilized in the range of 8–16% by weight of the fly ash in producing the OPAAB. The properties examined are hardened density, compressive strength, flexural strength, water absorption, efflorescence formation, and microstructural analysis. The experimental result revealed that the binders exhibited excellent long-term strength properties. The compressive strength of the OPAAP is well correlated with its hardened density. The pastes were found to exhibit good soundness characteristics over the long-term. The absorption of water decreases with an increase in the activator dosage from 8–12%, and beyond that, the water absorption relatively remains the same. Field emission scanning electron microscope (FESEM) micrograph revealed uniformly formed solid matrices with the micro-crack present were observed in the samples. The larger pore size promotes the crystallization of the resulting hydrate substances (N, C)-A-S-H gel. The initial dissolution of the OPAAP occurred within the first 30 min. At longer age of curing, mixtures with a higher dosage of powdered activator tend to absorb less water. Strength properties beyond 28 days are considered as the long-term strength.
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spelling pubmed-83483812021-08-08 Long-Term Strength Development of Fly Ash-Based One-Part Alkali-Activated Binders Haruna, Sani Mohammed, Bashar S. Wahab, Mohamed Mubarak A. Kankia, Mubarak Usman Amran, Mugahed Gora, Abdurra’uf Mukhtar Materials (Basel) Article This research aims to study the effect of the dosage of anhydrous sodium metasilicate activator on the long-term properties of fly ash-based one-part alkali-activated binders (OPAAB) cured at ambient conditions. Powdered sodium metasilicate activator was utilized in the range of 8–16% by weight of the fly ash in producing the OPAAB. The properties examined are hardened density, compressive strength, flexural strength, water absorption, efflorescence formation, and microstructural analysis. The experimental result revealed that the binders exhibited excellent long-term strength properties. The compressive strength of the OPAAP is well correlated with its hardened density. The pastes were found to exhibit good soundness characteristics over the long-term. The absorption of water decreases with an increase in the activator dosage from 8–12%, and beyond that, the water absorption relatively remains the same. Field emission scanning electron microscope (FESEM) micrograph revealed uniformly formed solid matrices with the micro-crack present were observed in the samples. The larger pore size promotes the crystallization of the resulting hydrate substances (N, C)-A-S-H gel. The initial dissolution of the OPAAP occurred within the first 30 min. At longer age of curing, mixtures with a higher dosage of powdered activator tend to absorb less water. Strength properties beyond 28 days are considered as the long-term strength. MDPI 2021-07-27 /pmc/articles/PMC8348381/ /pubmed/34361355 http://dx.doi.org/10.3390/ma14154160 Text en © 2021 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
Haruna, Sani
Mohammed, Bashar S.
Wahab, Mohamed Mubarak A.
Kankia, Mubarak Usman
Amran, Mugahed
Gora, Abdurra’uf Mukhtar
Long-Term Strength Development of Fly Ash-Based One-Part Alkali-Activated Binders
title Long-Term Strength Development of Fly Ash-Based One-Part Alkali-Activated Binders
title_full Long-Term Strength Development of Fly Ash-Based One-Part Alkali-Activated Binders
title_fullStr Long-Term Strength Development of Fly Ash-Based One-Part Alkali-Activated Binders
title_full_unstemmed Long-Term Strength Development of Fly Ash-Based One-Part Alkali-Activated Binders
title_short Long-Term Strength Development of Fly Ash-Based One-Part Alkali-Activated Binders
title_sort long-term strength development of fly ash-based one-part alkali-activated binders
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8348381/
https://www.ncbi.nlm.nih.gov/pubmed/34361355
http://dx.doi.org/10.3390/ma14154160
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