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Materials 2017, 10(9), 1022; doi:10.3390/ma10091022

Relationship between Degree of Deformation in Quartz and Silica Dissolution for the Development of Alkali-Silica Reaction in Concrete

1
Polytechnic School of Civil Engineering, IMED, Passo Fundo 99070-220, Brazil
2
Department of Geology, Universidade Federal do Rio Grande do Sul, Porto Alegre 91501-970, Brazil
3
Department of Civil Engineering, Universidade Federal do Rio Grande do Sul, Porto Alegre 90010-281, Brazil
4
Department of Services and Technological Innovation of FURNAS Centrais Elétricas S. A., Goiânia 74984-670, Brazil
5
Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USA
*
Author to whom correspondence should be addressed.
Received: 2 August 2017 / Revised: 20 August 2017 / Accepted: 29 August 2017 / Published: 4 September 2017
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

This paper presents research on the influence of quartz deformation in aggregates for the development of the alkali-silica reaction in concrete and its relationship with silica dissolution. The study also compares these characteristics with the field behavior of such rocks in concrete. The paper proposes parameters to classify the different degrees of deformation of quartz. Transmission electron microscopy showed the presence of walls even in slightly deformed quartz, which indicate the presence of the internal paths available to react with the alkaline concrete pore solutions and point to the potential development of an alkali-silica reaction. The presence of the deformation bands in the quartz grains leads to the alkali aggregate reaction occurring more rapidly. The visible spectrophotometer test was performed to evaluate the dissolution potential of the different samples of deformed quartz, which confirmed that the reactivity of the quartz increases as the deformation of the crystalline structure increases. The parameters established in the present study could be verified by analyzing the behavior of reactive and innocuous aggregates from the buildings. View Full-Text
Keywords: alkali-silica reaction; quartz; silica dissolution; deformation alkali-silica reaction; quartz; silica dissolution; deformation
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MDPI and ACS Style

Tiecher, F.; Gomes, M.E.B.; Dal Molin, D.C.C.; Hasparyk, N.P.; Monteiro, P.J.M. Relationship between Degree of Deformation in Quartz and Silica Dissolution for the Development of Alkali-Silica Reaction in Concrete. Materials 2017, 10, 1022.

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