Influence of crack reclosure on concrete permeability

Rahal, Saïd; Sellier, Alain

doi:10.1016/j.tafmec.2018.11.010

Cited by 4 publications

(4 citation statements)

References 45 publications

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“…Indeed, the liner is exposed to (i) the mechanical loading induced by the surrounding rock, (ii) concrete aging during the long term of disposal, and (iii) chemical disturbance due to the contact with the rock. All these processes increase the risk of fracturing, affecting the integrity of this disposal component [36]. Previous structural chemo-mechanical models decoupled the macroscopic modeling from the mesoscopic phenomena [37]; however, in order to compare concrete made of the different matrices, a non-linear analytical homogenization model for the chemical-mechanical behavior of concrete will be implemented.…”

Section: Chemo-mechanical Evolution Of Concrete Barriers (Magic)mentioning

confidence: 99%

Modelling of the long-term evolution and performance of engineered barrier system

Claret

Jacques²,

Sellin

2022

EPJ Nuclear Sci. Technol.

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Components of the so-called “multiple-barrier system” from the waste form to the biosphere include a combination of waste containers, engineered barriers, and natural barriers. The Engineered Barrier System (EBS) is crucial for containment and isolation in a radioactive waste disposal system. The number, types, and assigned safety functions of the various engineered barriers depend on the chosen repository concept, the waste form, the radionuclides waste inventory, the selected host rock, and the hydrogeological and geochemical settings of the repository site, among others. EBS properties will evolve with time in response to the thermal, hydraulic, mechanical, radiological, and chemical gradients and interactions between the various constituents of the barriers and the host rock. Therefore, assessing how these properties evolve over long time frames is highly relevant for evaluating the performance of a repository system and safety function evaluations in a safety case. For this purpose, mechanistic numerical models are increasingly used. Such models provide an excellent way for integrating into a coherent framework a scientific understanding of coupled processes and their consequences on different properties of the materials in the EBS. Their development and validation are supported by R&D actions at the European level. For example, within the HORIZON 2020 project BEACON (Bentonite mechanical evolution), the development, test, and validation of numerical models against experimental results have been carried out in order to predict the evolution of the hydromechanical properties of bentonite during the saturation process. Also, in relation to the coupling with mechanics, WP16 MAGIC (chemo Mechanical AGIng of Cementitious materials) of the EURAD Joint Programming Initiative focuses on multi-scale chemo-mechanical modeling of cementitious-based materials that evolve under chemical perturbation. Integration of chemical evolution in models of varying complexity is a major issue tackled in the WP2 ACED (Assessment of Chemical Evolution of ILW and HLW Disposal cells) of EURAD. WP4 DONUT (Development and improvement of numerical methods and tools for modeling coupled processes) of EURAD aims at developing and improving numerical models and tools to integrate more complexity and coupling between processes. The combined progress of those projects at a pan-European level definitively improves the understanding of and the capabilities for assessing the long-term evolution of engineered barrier systems.

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Section: Chemo-mechanical Evolution Of Concrete Barriers (Magic)mentioning

confidence: 99%

Modelling of the long-term evolution and performance of engineered barrier system

Claret

Jacques²,

Sellin

2022

EPJ Nuclear Sci. Technol.

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“…In 16 given in Figure 4. In this model, used to manage the cracking of the matrix, the crack opening (w I ) is included in the finite element displacement field [30]. This feature allows m to be used directly in (10) as explained above .…”

Section: State Laws For Each Phase Of Compositementioning

confidence: 99%

“…So, predicting the crack opening and permeability of such structures is an objective for engineers dealing with these problems. Although progress has been made in recent decades to link crack opening and leakage flow [12,31,32,30], the problem of crack opening assessment is still a major concern [36,24].…”

Section: Introductionmentioning

confidence: 99%

A homogenized formulation to account for sliding of non-meshed reinforcements during the cracking of brittle matrix composites: Application to reinforced concrete

Sellier

Millard

2019

Engineering Fracture Mechanics

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Non-linear finite element modelling of complex structures made of composites, such as reinforced concrete, remains a challenge because, until now, the only way to consider the important phenomenon of sliding between the reinforcements and the brittle matrix of the composite has been to mesh the reinforcements and their interfaces explicitly. This method is accurate but so expensive in terms of computational resources that only critical small elements of composites structures are modelled using it. To get around this limit, a method avoiding the meshing of composite reinforcements is proposed. It consists in treating the sliding between reinforcements and matrix with a differential formulation that provides the deformation of reinforcements directly as a continuous field superimposed to the displacement field of the matrix. The method needs a minor modification of the finite element code, which can take advantage of its analogy with the anisotropic thermal formulation. After the analytical presentation of the method, two theoretical cases of study are given to confront the results obtained with this method without meshing of reinforcements, with reference results obtained using a complete mesh of the matrix, reinforcements and interfaces.

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“…Zhang et al tested the permeability of 12 concrete specimen mixtures and found that the Klinkenberg factor was the key parameter of conversion (Zhang and Li, 2019). Rahal et al proposed a macroscopic model for predicting the evolution of permeability with cracking (Rahal and Sellier, 2019).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical and Permeability Properties of Lining Concrete Under Different Complex Stress Paths

et al. 2022

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A promising large-scale energy storage is underground compressed air energy storage (CAES) in lined rock caverns. To ensure the safety and stability of storage caverns because of the influence of periodic injection during production, it is crucial to understand the mechanical behavior of lining concrete under different complex stress paths. In this study, three types of uniaxial compressive fatigue test and uniaxial creep test were conducted on concrete. The following conclusions were obtained from the results. 1) The irreversible deformation after the interval was larger than that before the interval in the discontinuous multi-step cyclic loading (DMCL) test. 2) Loading velocity significantly influenced concrete fatigue, and the irreversible deformation in the cycle of low loading velocity was greater than that in the cycle of high loading velocity. 3) The residual strain increased with an increase in stress level. 4) The creep strain increased with an increase in stress level during the multi-step creep loading test; the fractional derivative results were more consistent with the experimental results. 5) The permeability of concrete increased rapidly under the influence of an external force when the stress level exceeded 0.73.

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Influence of crack reclosure on concrete permeability

Cited by 4 publications

References 45 publications

Modelling of the long-term evolution and performance of engineered barrier system

Modelling of the long-term evolution and performance of engineered barrier system

A homogenized formulation to account for sliding of non-meshed reinforcements during the cracking of brittle matrix composites: Application to reinforced concrete

Experimental Study on the Mechanical and Permeability Properties of Lining Concrete Under Different Complex Stress Paths

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