Meso-scale finite element modeling of Alkali-Silica-Reaction

Rezakhani, Roozbeh; Gallyamov, Emil; Molinari, Jean‐François

doi:10.1016/j.conbuildmat.2021.122244

Cited by 17 publications

(8 citation statements)

References 55 publications

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“…It, however, could be easily extended to model visco-elastic mortar at the meso-scale [Rezakhani et al, 2020]. It is interesting to compare the stiffness loss estimated via compressive and tensile tests, Fig.…”

Section: Meso-scale Model Calibrationmentioning

confidence: 99%

Multi-scale modelling of concrete structures affected by alkali-silica reaction: Coupling the mesoscopic damage evolution and the macroscopic concrete deterioration

Gallyamov,

Ramos,

Corrado

et al. 2020

Preprint

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A finite-element approach based on the first-order FE 2 homogenisation technique is formulated to analyse the alkali-silica reaction-induced damage in concrete structures, by linking the concrete degradation at the macro-scale to the reaction extent at the meso-scale. At the meso-scale level, concrete is considered as a heterogeneous material consisting of aggregates embedded in a mortar matrix. The mechanical effects of the Alkali-Silica Reaction (ASR) are modelled through the application of temperaturedependent eigenstrains in several localised spots inside the aggregates, and the mechanical degradation of concrete is modelled using continuous damage model, which is capable of reproducing the complex ASR crack networks. Then, the effective stiffness tensor and the effective stress tensor for each macroscopic finite element are computed by homogenising the mechanical response of the corresponding representative volume element (RVE), thus avoiding the use of phenomenological constitutive laws at the macro-scale. Convergence between macro-and meso-scales is achieved via an iterative procedure. A 2D model of an ASR laboratory specimen is analysed as a proof of concept. The model is able to account for the loading applied at the macro-scale and the ASR-product expansion at the meso-scale. The results demonstrate that the macroscopic stress state influences the orientation of damage inside the underlying RVEs.The effective stiffness becomes anisotropic in cases where damage is aligned inside the RVE.

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Section: Meso-scale Model Calibrationmentioning

confidence: 99%

Multi-scale modelling of concrete structures affected by alkali-silica reaction: Coupling the mesoscopic damage evolution and the macroscopic concrete deterioration

Gallyamov,

Ramos,

Corrado

et al. 2020

Preprint

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show abstract

“…Another very active research area concerns computational modelling of ASR damage [10]. The latter is an essential methodology for achieving in the future the prediction of the structural degradation under various boundary conditions [10][11][12][13][14]. However, due to the still limited understanding of the basic ASR cracking mechanisms, current numerical simulations have limited predictive power, since they are typically based on simplified chemo-mechanical models and on assumptions with limited validation.…”

Section: Introductionmentioning

confidence: 99%

“…The aggregate segmentation serves also the additional purpose of enabling the generation of more realistic computational spatial domains for the computational modelling. A typical example are finite element method meshes directly derived from the surfaces of the segmented aggregates, instead of representing them, e.g., as idealized spherical particles [13,41].…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of the evolution of ASR products and crack networks in the context of the concrete mesostructure

Shakoorioskooie

Griffa

Leemann

et al. 2022

Cement and Concrete Research

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“…ASR is considered at a wide range of scales: from a nanometer-thick layer of initial ASR-product within an aggregate up to a few hundred meters long ASR-affected concrete dam. Principal research questions comprise identification of the mechanism of crack opening and growth, investigation of the role of creep on damage extent as well as the source of the anisotropy in expansion of concrete [79,80].…”

Section: Subproject Vi: Numerical Modeling Of Mechanics Introductionmentioning

confidence: 99%

Alkali-silica reaction – a multidisciplinary approach

Leemann

Bagheri²,

Lothenbach³

et al. 2022

RILEM Tech Lett

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In the last four years, a multidisciplinary study involving several research groups in Switzerland tackled a number of unsolved, fundamental issues about the alkali-silica reaction (ASR) in concrete. The covered topics include SiO2 dissolution, the characterization of various ASR products formed at different stages of the reaction in both concrete and synthesis, crack formation and propagation. The encompassed scale ranges from nanometers to meters. Apart from conventional techniques, novel methods for the field of ASR have been used, e.g. combination of scanning electron microscopy with dissolution experiments, combination of focused ion beam with transmission electron microscopy, several synchrotron-based methods, synthesis of ASR products for in-depth characterization, time-lapse X-ray micro-tomography combined with contrast-enhancing measures and numerical models of ASR damage based on realistic crack patterns. Key achievements and findings are the quantification of the effect of aluminum on dissolution of different silicates, the variance in morphology and composition of initial ASR products, the differences and similarities between amorphous ASR products and calcium-silicate-hydrate, the link between temperature and the structure of the crystalline ASR products, the behavior of the crystalline ASR products at varying relative humidity, ASR propagation in 4D and numerical modelling based on realistic crack patterns.

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Meso-scale finite element modeling of Alkali-Silica-Reaction

Cited by 17 publications

References 55 publications

Multi-scale modelling of concrete structures affected by alkali-silica reaction: Coupling the mesoscopic damage evolution and the macroscopic concrete deterioration

Multi-scale modelling of concrete structures affected by alkali-silica reaction: Coupling the mesoscopic damage evolution and the macroscopic concrete deterioration

Quantitative analysis of the evolution of ASR products and crack networks in the context of the concrete mesostructure

Alkali-silica reaction – a multidisciplinary approach

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