Effect of Nuclear Radiation on Alkali-Silica Reaction of Concrete

Ichikawa, Tsuneki; Kimura, Takeshi

doi:10.1080/18811248.2007.9711372

Cited by 28 publications

(8 citation statements)

References 8 publications

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“…This nature of alterations which may occur, e.g., when minerals are exposed to radiation in the form of neutrons in nuclear power plants, can alter the chemical durability of the mineral(s), and in turn, the surrounding concrete due to the potential onset of ASR in even otherwise unreactive aggregates [32,[66][67][68][69][70]. In support of this idea, Figures 3(a-b) show the effects of alterations in network rigidity effected by ion-irradiation on the dissolution rates of albite and quartz in alkaline environments.…”

Section: Resultsmentioning

confidence: 99%

Rate controls on silicate dissolution in cementitious environments

Oey¹,

Hsiao²,

Callagon³

et al. 2017

RILEM Tech Lett

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The dissolution rate of silicate minerals and glasses in alkaline environments is of importance in cementitious systems due to its influences on: (a) earlyage 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 (n c , 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.

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Section: Resultsmentioning

confidence: 99%

Rate controls on silicate dissolution in cementitious environments

Oey¹,

Hsiao²,

Callagon³

et al. 2017

RILEM Tech Lett

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show abstract

“…Thus, damage and cracking of concrete can occur due to mechanical expansive stresses resulting from the irradiation-induced volume changes of the aggregates and the onset of dissolution-facilitated alkali-silica reaction (ASR) or alkalicarbonate reaction (ACR) for siliceous or carbonaceous aggregates. 12,13 Studies of irradiation-induced alterations of the atomic structure and reactivity of minerals have mainly focused on silicates such as quartz: SiO 2 , albite: NaAlSi 3 O 8 , and almandine: Fe 3 Al 2 Si 3 O 12which were observed to form disordered structures following their irradiation. 7,9,10 However, the effects of irradiation on carbonates remain less clear.…”

Section: Introductionmentioning

confidence: 99%

The effect of irradiation on the atomic structure and chemical durability of calcite and dolomite

et al. 2019

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When exposed to irradiation-e.g., in nuclear power plant environments-minerals may experience alterations in their atomic structure which, in turn, result in changes in their physical and chemical properties. Herein, we mimic via Ar + implantation the effects of neutron irradiation on calcite (CaCO 3 ) and dolomite (CaMg(CO 3 ) 2 )two carbonate minerals that often find use as aggregates in concrete: a material that is extensively used in the construction of critical structural and safety components in nuclear power plants. By a pioneering combination of nanoscale quantifications of mineral dissolution rates (i.e., a proxy for chemical durability) in alkaline solutions, vibrational (infrared and Raman) spectroscopy, and molecular simulations, we find that irradiation minimally affects the atomic structure and properties of these carbonate minerals. This insensitivity to radiation arises from the predominantly ionic nature of the interatomic bonds in these minerals which can relax and recover their initial configuration, thus ensuring minimal damage and permanent alterations to these minerals following radiation exposure. The outcomes have significant implications on the selection, use, and specification of mineral aggregates for use in nuclear concrete construction.

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“…A more recent study by Ichikawa and Kimura (2002) examined the effect of electron-beam irradiation on the reactivity of plagioclase (generally present in volcanic rock) to ASR. It was determined that irradiation of plagioclase with a 30-keV electron beam at a dose in excess of 0.9×10 9 Gy converts a crystalline plagioclase to an amorphous one 35 times more reactive to alkali than the crystal.…”

Section: Role Of Irradiation On Asrmentioning

confidence: 99%

A proposed aging management program for alkali silica reactions in a nuclear power plant

Saouma

2014

Nuclear Engineering and Design

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Effect of Nuclear Radiation on Alkali-Silica Reaction of Concrete

Cited by 28 publications

References 8 publications

Rate controls on silicate dissolution in cementitious environments

Rate controls on silicate dissolution in cementitious environments

The effect of irradiation on the atomic structure and chemical durability of calcite and dolomite

A proposed aging management program for alkali silica reactions in a nuclear power plant

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