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

Materials
Francieli TiecherRichard T Lermen

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, regardle...Continue Reading

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Citations

Nov 18, 2018·Materials·Daria Jóźwiak-NiedźwiedzkaTomasz Baran

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Methods Mentioned

BETA
transmission electron microscopy
X-ray
optical microscopy
NMR
energy dispersive spectrometry

Software Mentioned

Mexias

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