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The Effect of Mechanical Activation of Fly Ash on Cement-Based Materials Hydration and Hardened State Properties
Fly ash from coal represents the foremost waste product of fossil fuel combustion. These waste materials are most widely utilised in the cement and concrete industries, but the extent of their use is insufficient. This study investigated the physical, mineralogical, and morphological characteristics...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10146790/ https://www.ncbi.nlm.nih.gov/pubmed/37109794 http://dx.doi.org/10.3390/ma16082959 |
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author | Akmalaiuly, Kenzhebek Berdikul, Nazerke Pundienė, Ina Pranckevičienė, Jolanta |
author_facet | Akmalaiuly, Kenzhebek Berdikul, Nazerke Pundienė, Ina Pranckevičienė, Jolanta |
author_sort | Akmalaiuly, Kenzhebek |
collection | PubMed |
description | Fly ash from coal represents the foremost waste product of fossil fuel combustion. These waste materials are most widely utilised in the cement and concrete industries, but the extent of their use is insufficient. This study investigated the physical, mineralogical, and morphological characteristics of non-treated and mechanically activated fly ash. The possibility of enhancing the hydration rate of the fresh cement paste by replacing part of the cement with non-treated and mechanically activated fly ash, and the hardened cement paste’s structure and early compressive strength performance, were evaluated. At the first stage of the study, up to 20% mass of cement was replaced by untreated and mechanically activated fly ash to understand the impact of the mechanical activation on the hydration course; rheological properties, such as spread and setting time; hydration products; mechanical properties; and microstructure of fresh and hardened cement paste. The results show that a higher amount of untreated fly ash significantly prolongs the cement hydration process, decreases hydration temperature, deteriorates the structure and decreases compressive strength. Mechanical activation caused the breakdown of large porous aggregates in fly ash, enhancing the physical properties and reactivity of fly ash particles. Due to increased fineness and pozzolanic activity by up to 15%, mechanically activated fly ash shortens the time of maximum exothermic temperature and increases this temperature by up to 16%. Due to nanosized particles and higher pozzolanic activity, mechanically activated fly ash facilitates a denser structure, improves the contact zone between the cement matrix, and increases compressive strength up to 30%. |
format | Online Article Text |
id | pubmed-10146790 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-101467902023-04-29 The Effect of Mechanical Activation of Fly Ash on Cement-Based Materials Hydration and Hardened State Properties Akmalaiuly, Kenzhebek Berdikul, Nazerke Pundienė, Ina Pranckevičienė, Jolanta Materials (Basel) Article Fly ash from coal represents the foremost waste product of fossil fuel combustion. These waste materials are most widely utilised in the cement and concrete industries, but the extent of their use is insufficient. This study investigated the physical, mineralogical, and morphological characteristics of non-treated and mechanically activated fly ash. The possibility of enhancing the hydration rate of the fresh cement paste by replacing part of the cement with non-treated and mechanically activated fly ash, and the hardened cement paste’s structure and early compressive strength performance, were evaluated. At the first stage of the study, up to 20% mass of cement was replaced by untreated and mechanically activated fly ash to understand the impact of the mechanical activation on the hydration course; rheological properties, such as spread and setting time; hydration products; mechanical properties; and microstructure of fresh and hardened cement paste. The results show that a higher amount of untreated fly ash significantly prolongs the cement hydration process, decreases hydration temperature, deteriorates the structure and decreases compressive strength. Mechanical activation caused the breakdown of large porous aggregates in fly ash, enhancing the physical properties and reactivity of fly ash particles. Due to increased fineness and pozzolanic activity by up to 15%, mechanically activated fly ash shortens the time of maximum exothermic temperature and increases this temperature by up to 16%. Due to nanosized particles and higher pozzolanic activity, mechanically activated fly ash facilitates a denser structure, improves the contact zone between the cement matrix, and increases compressive strength up to 30%. MDPI 2023-04-07 /pmc/articles/PMC10146790/ /pubmed/37109794 http://dx.doi.org/10.3390/ma16082959 Text en © 2023 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 Akmalaiuly, Kenzhebek Berdikul, Nazerke Pundienė, Ina Pranckevičienė, Jolanta The Effect of Mechanical Activation of Fly Ash on Cement-Based Materials Hydration and Hardened State Properties |
title | The Effect of Mechanical Activation of Fly Ash on Cement-Based Materials Hydration and Hardened State Properties |
title_full | The Effect of Mechanical Activation of Fly Ash on Cement-Based Materials Hydration and Hardened State Properties |
title_fullStr | The Effect of Mechanical Activation of Fly Ash on Cement-Based Materials Hydration and Hardened State Properties |
title_full_unstemmed | The Effect of Mechanical Activation of Fly Ash on Cement-Based Materials Hydration and Hardened State Properties |
title_short | The Effect of Mechanical Activation of Fly Ash on Cement-Based Materials Hydration and Hardened State Properties |
title_sort | effect of mechanical activation of fly ash on cement-based materials hydration and hardened state properties |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10146790/ https://www.ncbi.nlm.nih.gov/pubmed/37109794 http://dx.doi.org/10.3390/ma16082959 |
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