Rate controls on silicate dissolution in cementitious environments

Tandre Oey, Yi-Hsuan Hsiao, Erika Callagon, Bu Wang, Isabella Pignatelli, Mathieu Bauchy, Gaurav Sant

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The dissolution rate of silicate minerals and glasses in alkaline environments is of importance in cementitious systems due to its influences on: (a) early-age reactivity that affects the rate of strength gain and microstructure formation, and/or, (b) chemical durability of aggregates; compromises in which can result deleterious processes such as alkali-silica reaction (ASR). In spite of decades of study, quantitative linkages between the atomic structure of silicates and their dissolution rate in aqueous media (i.e., chemical reactivity) has remained elusive. Recently, via pioneering applications of molecular dynamics simulations and nanoscale-resolved measurements of dissolution rates using vertical scanning interferometry, a quantitative basis has been established to link silicate dissolution rates to the topology (rigidity) of their atomic networks. Specifically, an Arrhenius-like expression is noted to capture the dependence between silicate dissolution rates and the average number of constraints placed on a central atom in a network (nc, i.e., an indicator of the network’s rigidity). This finding is demonstrated by: (i) ordering fly ashes spanning Ca-rich/poor variants in terms of their reactivity, and, (ii) assessing alterations in the reactivity of albite, and quartz following irradiation due to their potential to induce ASR in concrete exposed to radiation, e.g., in nuclear power plants.
Original languageEnglish
Pages (from-to)67-73
JournalRILEM Technical Letters
Volume2
DOIs
Publication statusPublished - Dec 2017
MoE publication typeA1 Journal article-refereed

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silicate
dissolution
rigidity
silica
alkaline environment
silicate mineral
nuclear power plant
interferometry
albite
durability
fly ash
topology
rate
microstructure
irradiation
glass
quartz
simulation
chemical

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Oey, T., Hsiao, Y-H., Callagon, E., Wang, B., Pignatelli, I., Bauchy, M., & Sant, G. (2017). Rate controls on silicate dissolution in cementitious environments. RILEM Technical Letters, 2, 67-73. https://doi.org/10.21809/rilemtechlett.2017.35
Oey, Tandre ; Hsiao, Yi-Hsuan ; Callagon, Erika ; Wang, Bu ; Pignatelli, Isabella ; Bauchy, Mathieu ; Sant, Gaurav. / Rate controls on silicate dissolution in cementitious environments. In: RILEM Technical Letters. 2017 ; Vol. 2. pp. 67-73.
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Oey, T, Hsiao, Y-H, Callagon, E, Wang, B, Pignatelli, I, Bauchy, M & Sant, G 2017, 'Rate controls on silicate dissolution in cementitious environments', RILEM Technical Letters, vol. 2, pp. 67-73. https://doi.org/10.21809/rilemtechlett.2017.35

Rate controls on silicate dissolution in cementitious environments. / Oey, Tandre; Hsiao, Yi-Hsuan; Callagon, Erika; Wang, Bu; Pignatelli, Isabella; Bauchy, Mathieu; Sant, Gaurav.

In: RILEM Technical Letters, Vol. 2, 12.2017, p. 67-73.

Research output: Contribution to journalArticleScientificpeer-review

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