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

Bonsembiante, Francieli Tiecher; Gomes, Márcia Elisa Boscato; Molin, Denise Carpena Coitinho Dal; Hasparyk, Nicole Pagan; Monteiro, Paulo J.M.

doi:10.3390/ma10091022

Cited by 13 publications

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“…As shown by Tiecher et al [ 6 ], five stages of deformation of the quartz grains can be individualized, which were later quantified in each of the rocks, as shown in Table 2 . The stages themselves are defined as follows:…”

Section: Resultsmentioning

confidence: 99%

“…The samples used in this study are the same as those of Tiecher et al [ 6 ]. A specific experimental procedure was employed in order to evaluate the influence of deformation intensity of quartz crystals on ASR.…”

Section: Methodsmentioning

confidence: 99%

“…By virtue of the undulatory extinction, this characteristic indicates the greater reactivity of quartz in alkali hydroxides of concrete. Wenk et al [ 5 ] and Tiecher et al [ 6 ] observed the formation of displacement walls in quartz grains by using transmission electron microscopy (TEM), thereby verifying that the displacements of the crystalline reticulum occur in small areas, where walls that divide the crystal into subgrains are formed, and that these have little or no displacement.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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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.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…Fluorescência de raios X (FRX) (TIECHER et al,2018;ABBAS et al,2019) para caracterizar as rochas usando análise química. Microscopia Eletrônica de Transmissão (MET) (TIECHER et al, 2017), com intuito de caracterizar o grau de deformação dos grãos de quartzo. Medidas de sílica dissolvida de acordo com norma ASTM C 289 (NETO et al, 2014;TIECHER et al, 2017;ABBAS et al, 2019).…”

Section: Ensaios Para Avaliar a Raaunclassified

Reações Expansivas Em Concretos Com Agregados Minerais: Uma Revisão

Lima¹,

Oliveira²

2020

REPECT

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A Reação Álcali-Agregado (RAA) é um mecanismo de deterioração que gera tensão, levando à formação de fissuras provenientes dos agregados na pasta de cimento. Isso tem levado pesquisadores e engenheiros a estudar e avaliar a causalidade de mudanças relacionadas às propriedades mecânicas do concreto que ocorrem devido à RAA em argamassas e concretos. Com os avanços tecnológicos e experimentais a respeito dos materiais cimentícios, observou-se que o concreto apresenta vulnerabilidade aos processos de deterioração no decorrer da sua utilização, devido a agressividade ambiental e tempo de ocorrência das reações em função do meio em que está inserido. Essas deteriorações são oriundas de diversos fatores, que se classificam em químicos como as reações expansivas e físicos, os efeitos das altas temperaturas, e os diferentes coeficientes de dilatação térmica dos agregados e da pasta de cimento endurecida. A RAA ocorre pela interação química dos constituintes do concreto, onde a sílica presente no agregado interage com os íons alcalinos pertinentes à pasta, na presença de umidade. O produto desta reação é um gel sílicoalcalino, frequentemente visível na interface pasta/agregado e nos poros do concreto, com característica expansiva. Uma vez identificada a presença da RAA, sua interrupção, bem como a recuperação da estrutura afetada gera um custo elevado. Assim, este artigo tem por finalidade apresentar os principais resultados de trabalhos executados na área, foram usados pelos autores um conjunto de ensaios e testes que podem ser usados para avaliar e identificar a reatividade dos agregados usados e métodos para mitigar os efeitos da RAA em concretos e argamassas.

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“…The contribution of cement particles to the strength of the concrete is closely related to their size [12,13]. Specifically, cement particle size controls the degree of hydration in the early hydration stage; i.e., finer cement particles lead to higher heat of hydration [14,15], with extremely fine cement particles being completely hydrated within 24 h [16].…”

Section: Introductionmentioning

confidence: 99%

Influences of Chemical Composition and Fineness on the Development of Concrete Strength by Curing Conditions

Lee¹,

Lee²

2019

Materials

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In this study, the influences of chemical composition and fineness on the development of concrete strength by curing conditions were investigated through performance evaluation of high SO3 Portland cement (HSPC) and ordinary Portland cement (OPC). At the same fineness (3800 cm2/g), the initial and final setting times of HSPC were 92 and 98 min less than OPC. Early mortar compressive strength was approximately 176% higher after 24 h. After curing for 15 h, 18 h, and 24 h, the maturity of HSPC concrete (107.4%, 109.6%, and 111.7%) and early compressive strength (146.4%, 170.7%, and 154.5%) were higher than measured for OPC concrete. HSPC fineness was 111.8% higher than OPC, leading to early activation of the hydration reaction. By X-ray fluorescence analysis, the SO3 content of HSPC was 107.9% that of OPC. The applicable time for HSPC concrete form removal was shorter than that for OPC concrete. The relationships y = −10.57 ln(x) + 47.30 and y = −9.84 ln(x) + 44.05 were estimated for predicting the early-age strength OPC and HSPC concrete. Therefore, applying HSPC concrete to an actual construction site is expected to shorten the construction period and reduce the heating curing cost in winter compared to OPC concrete.

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

Cited by 13 publications

References 16 publications

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

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

Reações Expansivas Em Concretos Com Agregados Minerais: Uma Revisão

Influences of Chemical Composition and Fineness on the Development of Concrete Strength by Curing Conditions

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