Characterization and identification of equilibrium and transfer moisture properties for ordinary and high-performance cementitious materials

Baroghel-Bouny, Véronique; Mainguy, M.; Lassabatère, Thierry; Coussy, Olivier

doi:10.1016/s0008-8846(99)00102-7

Cited by 424 publications

(213 citation statements)

References 21 publications

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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: 61%

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: 61%

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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“…Water vapour transfer is prevailing over liquid transfer in the lower humidity range, in the absence of a continuous liquid phase in the porous network. Liquid transfer is prevailing in the opposite case, for instance when a building component is in contact with wind-driven rain, or for the study of the drying processes of concrete [Mainguy et al, 2001, Baroghel-Bouny et al, 1999. To model both phases as driven by the same potential (usually p c ) for numerical applications, the Kelvin formula can be used to relate both pressures, although the formulation of their spatial and temporal derivatives leads to additional coupling terms in the equation [Janssen et al, 2007].…”

Section: Isothermal Moisture Transport Equationmentioning

confidence: 99%

Influence of Diffuse Damage on the Water Vapour Permeability of Fibre-Reinforced Mortar

et al. 2012

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The study of moisture transfer inside building materials is an important issue in building physics. The hygric characterization of such materials has become a common practice for the estimation of the hygrothermal performance of buildings. However, their aging caused by mechanical loading and environmental factors inevitably affects their permeability to moisture ingress, and the knowledge of how this permeability is affected by damage and cracks is still incomplete.The effects of diffuse damage caused by mechanical loading on the water vapour permeability of fibre-reinforced mortar were studied. A full experimental setup is presented including observation of the porous structure, mechanical, and hygric characterization. Uniaxial tensile loading was applied on prismatic samples while their damage level was measured. Then, the moisture content of damaged and undamaged samples was monitored during variations of ambient relative humidity. Two numerical methods are presented and used for the comparison of the water vapour permeability of multiple samples presenting various levels of damage. By this methodology, diffuse damage caused by mechanical loading is shown to have an impact on the water vapour transfer inside the material.

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“…When several phases occupy the pores the permeability for the fully saturated state should be modified accounting the presence of the other fluids. This change was defined by the relative permeability and depended on the fraction of other phases, capillary effects [23,24]. For the isotropic media, which were analysed using the model, the intrinsic permeability tensor equals: k = Ik, where k was intrinsic permeability, which was the scalar.…”

Section: Constitutive Relationsmentioning

confidence: 99%

“…The drying was caused by the rapid decrease of the ambient air relative humidity RH = 20 %. The porosity of the analyzed concrete was equal to u = 0.12, the intrinsic permeability k = 3.0 9 10 -21 , and the sorption isotherms as given in Baroghel-Bouny et al [23]. It was assumed that the primary crystallization had already passed, therefore A 0 = 1.…”

Section: Drying Experimentsmentioning

confidence: 99%

Experimental and numerical investigation of sodium sulphate crystallization in porous materials

Koniorczyk

Konca

2012

Heat Mass Transfer

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The experimental setup was constructed to measure the thermal effect of the salt crystallization/dissolution process in building materials containing sodium sulphate. Additional heat was released/consumed during the salt crystallization/dissolution. The mathematical model of salt, moisture and energy transport concerning the salt phase change kinetics was derived and based on it the computer code was developed. To solve the set of partial differential, governing equations the finite element and finite difference methods were used. By solving the inverse problem the parameters of the rate law for brick saturated with the sodium sulphate solution were determined.

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Characterization and identification of equilibrium and transfer moisture properties for ordinary and high-performance cementitious materials

Cited by 424 publications

References 21 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

Influence of Diffuse Damage on the Water Vapour Permeability of Fibre-Reinforced Mortar

Experimental and numerical investigation of sodium sulphate crystallization in porous materials

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