FFT-based model for irradiated aggregate microstructures in concrete

Cheniour, Amani; Li, Yujie; Sanahuja, Julien; Pape, Yann Le; Rodriguez, Elena Tajuelo; Anovitz, L. M.; Polavaram, Krishna C.; Garg, Nishant; Rosseel, Thomas M.

doi:10.1617/s11527-022-02010-x

Cited by 9 publications

(5 citation statements)

References 48 publications

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“…For the purpose of estimating the tolerance or the susceptibility of irradiated concrete aggregate and concrete against neutron irradiation, the 2D version is recommended. MOSAIC was validated [6] against the post-irradiation examination data published by the Japan Concrete Aging Management Program (JCAMP).…”

Section: Mosaic Capabilities 21 What Is Mosaic?mentioning

confidence: 99%

“…Hence, the resolution of the map is critical to obtain an accurate representation of the microstructure. The suggested size and resolution for an aggregate microstructure is > 335 × 335 pixels (≈ 15 µm per pixel) [6] -≈ 5 × 5 mm 2 . For a concrete microstructure, the suggested size and resolution are 500 × 500 pixels (≈ 50 µm per pixel) -≈ 25 × 25 mm 2 [7].…”

Section: Microstructure Generationmentioning

confidence: 99%

“…In addition, automated analysis of petrographic images makes it possible to obtain data on crystal size distribution. A method using a watershed-based algorithm is described in Cheniour et al [6] -Figure 3.…”

Section: Petrographymentioning

confidence: 99%

See 2 more Smart Citations

Methodological guidelines on concrete degradation based on predictive models and the release of MOSAIC for industry use

Le Pape

2024

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Section: Mosaic Capabilities 21 What Is Mosaic?mentioning

confidence: 99%

Section: Microstructure Generationmentioning

confidence: 99%

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Methodological guidelines on concrete degradation based on predictive models and the release of MOSAIC for industry use

Le Pape

2024

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“…In MOSAIC, the anisotropy of the volumetric change can be taken into account through a constant redistribution tensor. Cheniour et al [2] found that the role of RIVE anisotropy on the effective properties of irradiated rocks is predominant when the composition of the rocks is mainly homogeneous, such as in quartzite.…”

Section: Anisotropymentioning

confidence: 99%

“…MOSAIC includes an isotropic damage model with linear softening. In previous studies [2], the use of the implemented damage model was limited to the IPIs. The underlying assumption is that cracking occurs mainly at the mineral GBs.…”

Section: Isotropic Damagementioning

confidence: 99%

Microstructural Simulation of Ion-Irradiated Natural Rocks and Minerals

Pape¹,

Alnaggar²

2023

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This report details the contribution of Oak Ridge National Laboratory to the Nuclear Energy University Program (NEUP) project, "Rapid Characterization of Concrete Mineralogy using Multi-Scale Tools" led by the University of Illinois at Urbana-Champaign. To support the subsequent license renewal (SLR) of the US nuclear power plants (NPPs) fleet, the performance of concrete-forming aggregates against neutron irradiation needs to be assessed. Ion irradiation is proposed as a rapid, cost-effective surrogate method to full neutron irradiation testing. To complement the characterization of ion-irradiated rock specimens, ORNL has run finite-elements and fast-Fourier transform (FFT-based) simulations using the codes MARS and Microstructure-Oriented Scientific Analysis of Irradiated Concrete (MOSAIC). The main conclusion of this analysis is that the apparent post-ion-irradiation step-height underestimates the accumulated free radiation-induced volumetric expansion (RIVE) in the ion-implanted depth by about 15% at full amorphization and about 25% toward the beginning of the ion irradiation experiment. The discrepancy is explained by the fact that the step height is proportional to the sum of the RIVE (i.e., one third of the RIVE) and the irradiation-assisted plastic strains in the vertical direction (lower than two thirds of the RIVE). Because of the large lateral compressive stresses caused by the restraining effect of the unirradiated substrate, the stress field in the mineral grains and at the grain boundary (GB) in the ion-implanted layer is much different than the comparable stress field occurring during neutron irradiation. Hence, the mismatch RIVE causing cracks in the rock-forming minerals leads to different cracking patterns. Ion irradiation continues to be used as a rapid technique to assess the RIVE potential of rocks.

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