Role of granitic aggregates in the deterioration of a concrete dam

Fernandes, Isabel

doi:10.1007/s10064-014-0590-z

Cited by 15 publications

(4 citation statements)

References 25 publications

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“…When minerals such as micas, feldspars, clays, and zeolites are weathered, the release of alkalis is more intense and, as a result, the ASR process will be more deleterious [85][86][87]. The major contents of ASR products are silicon, sodium, potassium, and calcium, and the minor minerals are often aluminium, magnesium, and iron [51][52][53]. The typical ratio of (Na+k)/Si and Ca/Si is about 0.2-0.4 [30,[53][54][55][56][57].…”

Section: Discussionmentioning

confidence: 99%

“…According to the elements analysis, it can be concluded that these cracks were formed due to the formation of alkaline gel in the boundary between the aggregates and cement paste. The main elements composing ASR reaction product include silicon, potassium, sodium, and calcium, with minor amounts of aluminium, magnesium, and iron [41,42,[51][52][53]. The typical ratio of (Na + k)/Si and Ca/Si is about 0.2-0.4 [30,[53][54][55][56][57].…”

Section: Post-mortem Mortar Bar Microstructure Through Semmentioning

confidence: 99%

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Assessment of Alkali–Silica Reaction Potential in Aggregates from Iran and Australia Using Thin-Section Petrography and Expansion Testing

et al. 2022

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The alkali–silica reaction can shorten concrete life due to expansive pressure build-up caused by reaction by-products, resulting in cracking. Understanding the role of the aggregate, as the main reactive component, is essential for understanding the underlying mechanisms of the alkali–silica reaction and thereby reducing, or even preventing, any potential damage. The present study aims to investigate the role of petrographic studies along with accelerated tests in predicting and determining the potential reactivity of aggregates, including granite, rhyodacite, limestone, and dolomite, with different geological characteristics in concrete. This study was performed under accelerated conditions in accordance with the ASTM C1260 and ASTM C1293 test methods. The extent of the alkali–silica reaction was assessed using a range of microanalysis techniques including optical microscopy, scanning electron microscopy, energy-dispersive X-ray analysis, and X-ray powder diffraction. The results showed that a calcium-rich aggregate with only a small quantity of siliceous component but with a higher porosity and water adsorption rate can lead to degradation due to the alkali–silica reaction, while dolomite aggregate, which is commonly considered a reactive aggregate, showed no considerable expansion during the conducted tests. The results also showed that rhyodacite samples, due to their glassy texture, the existence of strained quartz and quartz with undulatory extinction, as well as the presence of weathering minerals, have a higher alkali-reactivity potential than granite samples.

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Section: Discussionmentioning

confidence: 99%

Section: Post-mortem Mortar Bar Microstructure Through Semmentioning

confidence: 99%

Assessment of Alkali–Silica Reaction Potential in Aggregates from Iran and Australia Using Thin-Section Petrography and Expansion Testing

et al. 2022

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“…The abundance of calcium in the cement paste leads to a fast precipitation of products either close to the interface with the aggregates or along the newly formed cracks. As ASR products take up calcium and release alkalis [11,19,[39][40][41][42][43], the final products present in the nearby cement paste are low Ca/Si-ratio types of C-S-H. The process from cracking of the aggregates, formation of low Ca/Si-ratio C-S-H along the cracks and stepwise widening of cracks is shown with its special-temporal evolution in [33,34].…”

Section: Introductionmentioning

confidence: 99%

Alkali Silica Reaction in Concrete - Revealing the Expansion Mechanism by Surface Force Measurements

Leemann,

Gora,

Lothenbach

et al. 2023

Preprint

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“…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%

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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Role of granitic aggregates in the deterioration of a concrete dam

Cited by 15 publications

References 25 publications

Assessment of Alkali–Silica Reaction Potential in Aggregates from Iran and Australia Using Thin-Section Petrography and Expansion Testing

Assessment of Alkali–Silica Reaction Potential in Aggregates from Iran and Australia Using Thin-Section Petrography and Expansion Testing

Alkali Silica Reaction in Concrete - Revealing the Expansion Mechanism by Surface Force Measurements

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

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