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Durability of Mortars with Fly Ash Subject to Freezing and Thawing Cycles and Sulfate Attack
Destruction of cement composites occurs due to the alternate or simultaneous effects of aggressive media, resulting in the destruction of concrete under the influence of chemical and physical factors. This article presents the results of changes in the measurement of linear strains of samples and ch...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8745888/ https://www.ncbi.nlm.nih.gov/pubmed/35009365 http://dx.doi.org/10.3390/ma15010220 |
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author | Jaworska-Wędzińska, Monika Jasińska, Iga |
author_facet | Jaworska-Wędzińska, Monika Jasińska, Iga |
author_sort | Jaworska-Wędzińska, Monika |
collection | PubMed |
description | Destruction of cement composites occurs due to the alternate or simultaneous effects of aggressive media, resulting in the destruction of concrete under the influence of chemical and physical factors. This article presents the results of changes in the measurement of linear strains of samples and changes in the microstructure of cement after 30 freezing and thawing cycles and immersed in 5% sodium sulfate solution. The compressive strengths ratios were carried out at the moment when the samples were moved to the sulfate solution after 30 cycles and at the end of the study when the samples showed visual signs of damage caused by the effect of 5% Na(2)SO(4). The composition of the mixtures was selected based on the Gibbs triangle covering the area up to 40% replacement of Portland cement with low and high-calcium fly ashes or their mixture. Air-entrained and non-air entrained mortars were made of OPC, in which 20%, 26.6%, and 40% of Portland cement were replaced with low and/or high-calcium fly ash. Initial, freezing and thawing cycles accelerated the destruction of non- air-entrained cement mortars immersed in 5% sodium sulfate solution. The sulfate resistance, after the preceding frost damage, decreased along with the increase in the amount of replaced fly ash in the binder. Air-entrained mortars in which 20% of cement was replaced with high-calcium fly ash showed the best resistance to the action of sodium sulfate after 30 freezing and thawing cycles. |
format | Online Article Text |
id | pubmed-8745888 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-87458882022-01-11 Durability of Mortars with Fly Ash Subject to Freezing and Thawing Cycles and Sulfate Attack Jaworska-Wędzińska, Monika Jasińska, Iga Materials (Basel) Article Destruction of cement composites occurs due to the alternate or simultaneous effects of aggressive media, resulting in the destruction of concrete under the influence of chemical and physical factors. This article presents the results of changes in the measurement of linear strains of samples and changes in the microstructure of cement after 30 freezing and thawing cycles and immersed in 5% sodium sulfate solution. The compressive strengths ratios were carried out at the moment when the samples were moved to the sulfate solution after 30 cycles and at the end of the study when the samples showed visual signs of damage caused by the effect of 5% Na(2)SO(4). The composition of the mixtures was selected based on the Gibbs triangle covering the area up to 40% replacement of Portland cement with low and high-calcium fly ashes or their mixture. Air-entrained and non-air entrained mortars were made of OPC, in which 20%, 26.6%, and 40% of Portland cement were replaced with low and/or high-calcium fly ash. Initial, freezing and thawing cycles accelerated the destruction of non- air-entrained cement mortars immersed in 5% sodium sulfate solution. The sulfate resistance, after the preceding frost damage, decreased along with the increase in the amount of replaced fly ash in the binder. Air-entrained mortars in which 20% of cement was replaced with high-calcium fly ash showed the best resistance to the action of sodium sulfate after 30 freezing and thawing cycles. MDPI 2021-12-28 /pmc/articles/PMC8745888/ /pubmed/35009365 http://dx.doi.org/10.3390/ma15010220 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 Jaworska-Wędzińska, Monika Jasińska, Iga Durability of Mortars with Fly Ash Subject to Freezing and Thawing Cycles and Sulfate Attack |
title | Durability of Mortars with Fly Ash Subject to Freezing and Thawing Cycles and Sulfate Attack |
title_full | Durability of Mortars with Fly Ash Subject to Freezing and Thawing Cycles and Sulfate Attack |
title_fullStr | Durability of Mortars with Fly Ash Subject to Freezing and Thawing Cycles and Sulfate Attack |
title_full_unstemmed | Durability of Mortars with Fly Ash Subject to Freezing and Thawing Cycles and Sulfate Attack |
title_short | Durability of Mortars with Fly Ash Subject to Freezing and Thawing Cycles and Sulfate Attack |
title_sort | durability of mortars with fly ash subject to freezing and thawing cycles and sulfate attack |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8745888/ https://www.ncbi.nlm.nih.gov/pubmed/35009365 http://dx.doi.org/10.3390/ma15010220 |
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