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Materials 2018, 11(6), 924; https://doi.org/10.3390/ma11060924

Degradation of Glaukonite Sandstone as a Result of Alkali-Silica Reactions in Cement Mortar

Department of Building Engineering Technologies and Organization, Kielce University of Technology, Al. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland
Received: 5 May 2018 / Revised: 23 May 2018 / Accepted: 24 May 2018 / Published: 30 May 2018
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Abstract

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. View Full-Text
Keywords: alkali-silica reaction; microstructures; sandstone degradation; petrography; SEM-EDS alkali-silica reaction; microstructures; sandstone degradation; petrography; SEM-EDS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Czapik, P. Degradation of Glaukonite Sandstone as a Result of Alkali-Silica Reactions in Cement Mortar. Materials 2018, 11, 924.

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