Modelling the drying shrinkage of porous materials by considering both capillary and adsorption effects

Dangla, Patrick; Vandamme, Matthieu; Bottoni, Marina; Granet, S.

doi:10.1016/j.jmps.2020.104016

Cited by 25 publications

(14 citation statements)

References 48 publications

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“…Several models exist to describe the thickness 𝑡 of the adsorbed layer of water, mainly the models of Hagymassy et al [41] and Badmann et al [42]. When comparing surface adsorption effects with capillary effects, one expects capillary effects to prevail at high relative humidity (i.e., larger than about 50%) and surface adsorption effects to prevail at low relative humidity levels (i.e., lower than about 50%) [81]. Note that, strictly speaking, deformations are due to variations of the surface stress and not of the surface free energy.…”

Section: Physics Of Drying Shrinkagementioning

confidence: 99%

Advances in atomistic modeling and understanding of drying shrinkage in cementitious materials

Qomi

Brochard

Honório

et al. 2021

Cement and Concrete Research

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Section: Physics Of Drying Shrinkagementioning

confidence: 99%

Advances in atomistic modeling and understanding of drying shrinkage in cementitious materials

Qomi

Brochard

Honório

et al. 2021

Cement and Concrete Research

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“…For cluster i, the flux F ni is related to the vapor partial pressure field around the cluster according to Eqs. ( 3) and (8). Because this flux to equilibrium vapor pressure relationship is linear, Newton's method converges with only one iteration, and hence, the computational time is simply n Â t.…”

Section: A Kelvin Effect Implementationmentioning

confidence: 99%

Pore network model of drying with Kelvin effect

2021

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A pore network model of isothermal drying is presented. The model takes into account the capillary effects, the transport of vapor by diffusion, including Knudsen effect, in the gas phase, and the Kelvin effect. The model is seen as a first step toward the simulation of drying in mesoscopic porous materials involving pore sizes between 4 nm and 50 nm. The major issue addressed with the present model is the computation of the menisci mean curvature radius at the boundary of each liquid cluster in conjunction with the Kelvin effect. The impact of Kelvin effect on the drying process is investigated, varying the relative humidity in the ambient air outside the medium. The simulations indicate that the Kelvin effect has a significant impact on the liquid distribution during drying. The evaporation rate is found to fluctuate due to the menisci curvature variations during drying. The simulations also highlight a noticeable non-local equilibrium effect.

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“…Then, the CTE of cement pastes is calculated from experimental results. The following section will estimate the CTE based on the drying shrinkage model of (El Tabbal et al 2020) before concluding with the study's findings.…”

Section: Introductionmentioning

confidence: 99%

Thermal Expansion of Cement Paste at Various Relative Humidities after Long-term Drying: Experiments and Modeling

Aili

Maruyama

Vandamme³

2023

ACT

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The coefficient of thermal expansion (CTE) of cement paste is an essential parameter for estimating cracks of cementbased structures, including under normal operating conditions. The CTE of low-heat Portland cement pastes dried for a long term at various relative humidities were measured by applying trapezoidal temperature history. The measured CTE was a convex function when displayed versus relative humidity and was highest at the relative humidity of 58%. At the relative humidity of 11%, the CTE was similar to the one of the fully dried sample. Based on a drying shrinkage model in the literature that classifies pore water as free liquid water and adsorbed water, we computed pore pressure change and corresponding strain, from which the CTEs were estimated. The microstructural rearrangements of cement paste due to long-term drying were taken into account by obtaining pore size distributions from water vapor sorption isotherm. The CTEs predicted with the model agree well with the measured ones.

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Modelling the drying shrinkage of porous materials by considering both capillary and adsorption effects

Cited by 25 publications

References 48 publications

Advances in atomistic modeling and understanding of drying shrinkage in cementitious materials

Advances in atomistic modeling and understanding of drying shrinkage in cementitious materials

Pore network model of drying with Kelvin effect

Thermal Expansion of Cement Paste at Various Relative Humidities after Long-term Drying: Experiments and Modeling

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