Effects of Irradiation on Albite’s Chemical
Durability
Version 3 2018-09-23, 13:13
Version 2 2017-10-04, 19:50
Version 1 2017-10-04, 19:44
Posted on 2018-09-23 - 13:13
Albite (NaAlSi3O8), a framework silicate
of the plagioclase feldspar family and a common constituent of felsic
rocks, is often present in the siliceous mineral aggregates that compose
concrete. When exposed to radiation (e.g., in the form of neutrons)
in nuclear power plants, the crystal structure of albite can undergo
significant alterations. These alterations may degrade its chemical
durability. Indeed, careful examinations of Ar+-implanted
albite carried out using Fourier transform infrared spectroscopy (FTIR)
and molecular dynamics simulations show that albite’s crystal
structure, upon irradiation, undergoes progressive disordering, resulting
in an expansion in its molar volume (i.e., a reduction of density)
and a reduction in the connectivity of its atomic network. This loss
of network connectivity (i.e., rigidity) results in an enhancement
of the aqueous dissolution rate of albitemeasured using vertical
scanning interferometry (VSI) in alkaline environmentsby a
factor of 20. This enhancement in the dissolution rate (i.e., reduction
in chemical durability) of albite following irradiation has significant
impacts on the durability of felsic rocks and of concrete containing
them upon their exposure to radiation in nuclear power plant (NPP)
environments.
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Hsiao, Yi-Hsuan; La Plante, Erika Callagon; Krishnan, N. M. Anoop; Le Pape, Yann; Neithalath, Narayanan; Bauchy, Mathieu; et al. (2017). Effects of Irradiation on Albite’s Chemical
Durability. ACS Publications. Collection. https://doi.org/10.1021/acs.jpca.7b05098
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AUTHORS (7)
YH
Yi-Hsuan Hsiao
EL
Erika Callagon La Plante
NK
N. M. Anoop Krishnan
YL
Yann Le Pape
NN
Narayanan Neithalath
MB
Mathieu Bauchy
GS
Gaurav Sant