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Degradation of Glaukonite Sandstone as a Result of Alkali-Silica Reactions in Cement Mortar
The mechanism of concrete degradation as a result of an alkali-silica reaction (ASR) largely depends on the mineral composition and microstructure of the reactive aggregate. This paper shows the reactivity results of quartz-glaukonitic sandstone, which is mainly responsible for the reactivity of som...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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MDPI
2018
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6025000/ https://www.ncbi.nlm.nih.gov/pubmed/29848958 http://dx.doi.org/10.3390/ma11060924 |
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author | Czapik, Przemysław |
author_facet | Czapik, Przemysław |
author_sort | Czapik, Przemysław |
collection | PubMed |
description | The mechanism of concrete degradation as a result of an alkali-silica reaction (ASR) largely depends on the mineral composition and microstructure of the reactive aggregate. This paper shows the reactivity results of quartz-glaukonitic sandstone, which is mainly responsible for the reactivity of some post-glacial gravels, available in Poland. After initial petrographic observations under a light microscope, the mode of sandstone degradation triggered by the reaction with sodium and potassium hydroxides was identified using scanning electron microscopy (SEM). It has been found that chalcedony agglomerates present in sandstone are separated from the rock matrix and subsequently cause the cracks formation in this matrix. Additionally, microcrystalline and potentially reactive silica is also dispersed in sandstone cement. |
format | Online Article Text |
id | pubmed-6025000 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-60250002018-07-09 Degradation of Glaukonite Sandstone as a Result of Alkali-Silica Reactions in Cement Mortar Czapik, Przemysław Materials (Basel) Article The mechanism of concrete degradation as a result of an alkali-silica reaction (ASR) largely depends on the mineral composition and microstructure of the reactive aggregate. This paper shows the reactivity results of quartz-glaukonitic sandstone, which is mainly responsible for the reactivity of some post-glacial gravels, available in Poland. After initial petrographic observations under a light microscope, the mode of sandstone degradation triggered by the reaction with sodium and potassium hydroxides was identified using scanning electron microscopy (SEM). It has been found that chalcedony agglomerates present in sandstone are separated from the rock matrix and subsequently cause the cracks formation in this matrix. Additionally, microcrystalline and potentially reactive silica is also dispersed in sandstone cement. MDPI 2018-05-30 /pmc/articles/PMC6025000/ /pubmed/29848958 http://dx.doi.org/10.3390/ma11060924 Text en © 2018 by the author. 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 (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Czapik, Przemysław Degradation of Glaukonite Sandstone as a Result of Alkali-Silica Reactions in Cement Mortar |
title | Degradation of Glaukonite Sandstone as a Result of Alkali-Silica Reactions in Cement Mortar |
title_full | Degradation of Glaukonite Sandstone as a Result of Alkali-Silica Reactions in Cement Mortar |
title_fullStr | Degradation of Glaukonite Sandstone as a Result of Alkali-Silica Reactions in Cement Mortar |
title_full_unstemmed | Degradation of Glaukonite Sandstone as a Result of Alkali-Silica Reactions in Cement Mortar |
title_short | Degradation of Glaukonite Sandstone as a Result of Alkali-Silica Reactions in Cement Mortar |
title_sort | degradation of glaukonite sandstone as a result of alkali-silica reactions in cement mortar |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6025000/ https://www.ncbi.nlm.nih.gov/pubmed/29848958 http://dx.doi.org/10.3390/ma11060924 |
work_keys_str_mv | AT czapikprzemysław degradationofglaukonitesandstoneasaresultofalkalisilicareactionsincementmortar |