Microstructure parameters affecting alkali–silica reactivity of aggregates

Šachlová, Šarka

doi:10.1016/j.conbuildmat.2013.08.087

Cited by 10 publications

(4 citation statements)

References 19 publications

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“…TEM analysis shows the selected grain has displacement walls (Figure 4b,c). According to Putnis [14], displacement is a small flawed line in which the network of atoms breaks within the crystal. The displacement walls are defined by the edge of the flawed network of atoms.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, many studies have shown that microcrystalline quartz grains are more reactive and promote greater silica dissolution than grains with intense undulatory extinction [12,13,14]. However, the continuous increase in the displacements of the crystal leads to a clustering of the networks, known as sub-grain walls which, with the boost in tensions, can break the original grain and thus form new recovered grains, that is, grains which do not have displacements.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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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.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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“…Un estudio reciente [257] ha relacionado directamente el tamaño de grano del cuarzo con la superficie específica (siendo la superficie específica la relación que hay entre el perímetro del grano de cuarzo entre el área de ese mismo grano, ver fórmula) y la reactividad de la roca, medida por medio de la expansión en el ensayo acelerado de barras de mortero (Gráfica 20).…”

Section: Tamaño De Grano Y Reactividadunclassified

“…Gráfica 20. Relación entre la superficie específica y la expansión en barras de mortero a 14 días [257] Por otro lado, Monteiro, Shomglin, Wenk y Hasparyk en 2001, realizaron una investigación con rocas deformadas. De ese estudio se deduce nuevamente, la relación entre el tamaño de grano de la roca y la expansión producida (Gráfica 21).…”

Section: Tamaño De Grano Y Reactividadunclassified