Modélisation du séchage des bétons. Analyse des différents modes de transfert hydrique

Thiéry, Mickaël; Baroghel-Bouny, Véronique; Bourneton, Nicolas; vilain, Géraldine; Stefani, C.

doi:10.3166/regc.11.541-578

Cited by 19 publications

(33 citation statements)

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“…15. It is worth pointing out that the experimental data given in [38] were collected from [11,[39][40][41][42]. The simulation results show a general satisfactory agreement with the experimental data.…”

Section: D Equilibrium Distribution Of Water and Gas Phasessupporting

confidence: 64%

Pore-scale modelling of relative permeability of cementitious materials using X-ray computed microtomography images

Zhang

2017

Cement and Concrete Research

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Permeability of cementitious materials is an important durability indicator. In practice, concrete is rarely saturated. Therefore, it is essential to study permeability of unsaturated cementitious materials. This paper presents an integrated modelling approach for estimating permeability of cementitious materials over the full range of saturation. An in-house code based on multiphase and single-phase lattice Boltzmann models is developed and used to simulate the moisture distribution and fluid flow in unsaturated cement paste with various curing ages, the 3D microstructures of which are obtained from X-ray micro-CT. The water permeability and gas permeability of partially saturated cement paste are then estimated. The results indicate with decreasing water saturation water permeability decreases while gas permeability increases. Additionally, the moisture distribution and permeability of unsaturated cement paste are strongly dependent on its microstructure. Moreover, there exists a unique relationship between permeability and effective porosity. The simulation results show good agreement with experimental data.

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Section: D Equilibrium Distribution Of Water and Gas Phasessupporting

confidence: 64%

Pore-scale modelling of relative permeability of cementitious materials using X-ray computed microtomography images

Zhang

2017

Cement and Concrete Research

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“…Dripping is not considered in the present model and transport of water out of the concrete is initiated by water vapour diffusion to the external boundary of the component (where the dry ventilation air is represented by a boundary condition). Thus, the nonlinear expression of tortuosity in the water vapour diffusion process [2,5] plays a key role in the initiation of atmospheric carbonation. For lowpermeability concrete materials, expressions adopted for the diffusion coefficient are similar to the classical Millington and Quirk [6] model developed for soils:…”

Section: Processesmentioning

confidence: 99%

“…However, laboratory tests have shown that carbonation reactions are strongly inhibited in a dry material, as soon as liquid saturation is lower than ~0,3 [10]. This phenomenon has to be taken into account to correctly adjust the dynamics of drying [2], which is strongly coupled to carbonation. A new functionality was therefore introduced to describe the dependency of the kinetics of the chemical process with respect to water saturation.…”

Section: Epj Web Of Conferencesmentioning

confidence: 99%

“…In these calculations, Darcy flow of liquid water and air is considered, taking into account capillary forces and the Klinkenberg effect in the gas phase. Vapour pressure lowering, due to capillarity effects, is also accounted for, as described by Kelvin's model [2,3]. Wetting properties and relative permeability of the media are expressed using the van Genuchten -Mualem [4] (liquid phase) and Parker (gaseous phase) models [3].…”

Section: Processesmentioning

confidence: 99%

“…(1), and (2) an additional "slipping" factor was introduced to allow for the difference between intrinsic material permeability with respect to the gas phase and to the liquid phase (Table 1), consistent with material data from the literature [1,2]. The carbonation simulations were performed using the Thermoddem lv12 (2008) database, developed by BRGM (Orléans, France) [9].…”

Section: Simulation Tools and Configurationsmentioning

confidence: 99%

See 2 more Smart Citations

Modeling of concrete carbonation in deep geological disposal of intermediate level waste

Thouvenot

Bildstein

Munier

et al. 2013

EPJ Web of Conferences

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Abstract.Simulations of atmospheric carbonation of Intermediate-Level Long-lived radioactive Waste (ILLW) concrete packages were conducted to evaluate their possible chemical degradations. Two-phase liquid water-air flow is combined with gas component diffusion processes leading to a progressive drying of the concrete. Complete drying of the 11 cm thick waste disposal package wall occurs over a period ranging from 2 years for the low-performance concrete to 10 years for the highperformance concrete. The drying process slows down when transport characteristics of concretes are enhanced. Carbonation depths in the order of 2 to 3 cm in 100 years are predicted for this cementitious component. However, these values are slightly overestimated compared to experimental data. Also the kinetic model of mineral reactivity requires improvements with respect to the protective effect of secondary carbonates and to thermodynamic data.

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A Model for Hydration‐Drying Interactions in the Concrete Cover

Nguyen¹,

Thiéry²,

Belin³

2013

Thermo‐Hydromechanical and Chemical Coupling in Geomaterials and Applications

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Modélisation du séchage des bétons. Analyse des différents modes de transfert hydrique

Cited by 19 publications

References 0 publications

Pore-scale modelling of relative permeability of cementitious materials using X-ray computed microtomography images

Pore-scale modelling of relative permeability of cementitious materials using X-ray computed microtomography images

Modeling of concrete carbonation in deep geological disposal of intermediate level waste

A Model for Hydration‐Drying Interactions in the Concrete Cover

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