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Materials 2018, 11(9), 1692; https://doi.org/10.3390/ma11091692

Influence of the Quartz Deformation Structures for the Occurrence of the Alkali–Silica Reaction

1
Polytechnic School of Civil Engineering, Faculdade Meridional IMED, Passo Fundo 99070-220, Brazil
2
Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos 13566-590, Brazil
3
Department of Civil Engineering, Universidade Federal do Espírito Santo, Vitória 29075-910, Brazil
4
Department of Geology, Universidade Federal do Rio Grande do Sul, Porto Alegre 90040-060, Brazil
5
Department of Civil Engineering, Universidade Federal do Rio Grande do Sul, Porto Alegre 90040-060, Brazil
*
Author to whom correspondence should be addressed.
Received: 7 August 2018 / Revised: 8 September 2018 / Accepted: 10 September 2018 / Published: 12 September 2018
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

Defects in the crystalline structure of quartz facilitate the connection with the alkali hydroxides, since under a high alkalinity condition (e.g., in concrete), the Si-O bonds of quartz are easily broken. This study set out to investigate the influence of the deformation structures of quartz on its susceptibility to the alkali–silica reaction. A granite, a protomylonite, and a mylonite were selected for this study. Using optical microscopy, the quartz grains contained in these rocks were quantified and their texture characterized. The quartz samples extracted from the rocks were analyzed by magnetic nuclear resonance, to evaluate their potential for dissolving silica as well as changes in their atomic scale before and after the reaction with alkali hydroxides. These analyses were compared with the results of the accelerated mortar bar test. The study showed that the quartz with intense undulatory extinction and deformation bands denotes the most favorable condition to the development of the alkali–silica reaction. However, on an atomic scale, the slightly deformed grains were highly prone to react. Thus, in a high alkalinity condition, over a long period of time, any quartz tends to develop the alkali–silica reaction, regardless of the deformation degree of the grain. View Full-Text
Keywords: alkali–silica reaction; quartz; silica dissolution alkali–silica reaction; quartz; silica dissolution
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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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Tiecher, F.; Florindo, R.N.; Vieira, G.L.; Gomes, M.E.B.; Dal Molin, D.C.C.; Lermen, R.T. Influence of the Quartz Deformation Structures for the Occurrence of the Alkali–Silica Reaction. Materials 2018, 11, 1692.

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