Effects of inter-phase mass transfer in heated clays: A mixture theory

Ma, Chenmin; Hueckel, Tomasz

doi:10.1016/0020-7225(92)90126-2

Cited by 29 publications

(6 citation statements)

References 26 publications

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“…Yang and Arouk [4] experimentally investigated the heat conductivity of heat-treated clay bricks. Studies were also performed on the usage of heat-treated clay bricks for safe storage and destruction of the radioactive disposals [5,6]. Tanaka et al [7] studied the stress -strain behaviors of the reconstructed illitic clay at different temperatures.…”

Section: Introductionmentioning

confidence: 99%

Variation of some engineering properties of clays with heat treatment

2004

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Section: Introductionmentioning

confidence: 99%

Variation of some engineering properties of clays with heat treatment

2004

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“…This distinction is necessary to provide elastic constitutive equations that describe coupling effects in swelling clays, and it will be stressed in the present formulation. Ma and Hueckel (1992) and Hueckel (1992a,b) proposed to treat clays exposed to thermal and chemical loads as a two phase mixture, with absorbed water being a part of solid phase, and an interphase transfer to model its absorption and desorption process. Hueckel (1992a,b) extended Terzaghi's principle of effective stress by postulating an a priori equality of the skeletal and absorbed water isotropic partial stresses, and an explicit chemical strain additive with mechanical strain, focusing on its impact on plasticity.…”

Section: Previous Mechanical Approachesmentioning

confidence: 99%

“…Adsorbed water has been considered as a third phase by Murad (1999) and endowed with a partial stress, related thermodynamically to the total fluid volume fraction. Here, we will follow a kinematic criterion of phase identification, Hueckel (1992a) and Ma and Hueckel (1992), and attribute the absorbed water to the solid phase based on the affinity of their velocities.…”

Section: A Model For Chemo-mechanical Couplingmentioning

confidence: 99%

Chemo-mechanical coupling in saturated porous media: elastic–plastic behaviour of homoionic expansive clays

Loret

Hueckel

Gajo

2002

International Journal of Solids and Structures

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121

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Chemically active saturated homoionic clays are considered in a two-phase framework. The solid phase contains the clay particles, absorbed water and salt. The fluid phase, or pore water, contains free water and salt. Water, and possibly salt, can transfer between the two phases. In addition free water may diffuse through the porous medium. A global understanding of the phenomena involved, namely deformation, transfer and diffusion, is proposed. Emphasis is laid on the chemo-mechanical constitutive equations in an elastic-plastic setting. Elastic chemo-mechanical coupling is introduced through a potential, in such a way that the tangent poro-elasticity matrix remains symmetric. Material parameters needed to quantify the coupling are calibrated from specific experiments available in the recent literature. The elasto-plastic behaviour aims at reproducing qualitatively and quantitatively the typical experimental responses observed on almost pure Na-Montmorillonite clays during chemical and mixed chemo-mechanical loadings. Increase of the salinity of pore water at a constant confinement stress leads to a volume decrease, so-called chemical consolidation. Subsequent exposure to a distilled water solution produces swelling: however, the latter is smaller than the chemical consolidation so that the chemical loading cycle results in a net contractancy, the amount of which increases with the confinement. In fact, plastic yielding takes place at low salinities of pore water, and when it stops, chemical preconsolidation is generated.Natural clays which contain cations of different species are considered in a companion paper, Gajo et al. [Int. J. Solids Struct., this issue], as they require to account for electro-chemo-mechanical couplings. Ó

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“…Meth. Geomech., 23, 673}696 (1999) reference con"guration the expansions contain no linear term in E , the above together with (14), (17) and (26) gives…”

Section: Near-equilibrium Resultsmentioning

confidence: 94%

Thermomechanical model of hydration swelling in smectitic clays: I two-scale mixture-theory approach

Murad

1999

Int. J. Numer. Anal. Meth. Geomech.

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A thermomechanical theory of hydration swelling in smectitic clays is proposed. The clay is treated as a three-scale swelling system wherein macroscopic governing equations are derived by upscaling the microstructure. At the microscale the model has two phases, the disjoint clay platelets and adsorbed water (water between the platelets). At the intermediate (meso) scale (the homogenized microscale) the model consists of clay particles (adsorbed water plus clay platelets) and bulk water. At the macroscale the medium is treated as an homogenized swelling mixture of clay particles and bulk-phase water with thermodynamic properties de"ned everywhere within the macroscopic body. In Part I, the mesoscopic model governing the swelling of the clay particles is derived using a mixture-theoretic approach and the Coleman and Noll method of exploitation of the entropy inequality. Application of this procedure leads to two-scale governing equations which generalize the classical thermoelastic consolidation model of non-swelling media, as they exhibit additional physico-chemical and viscous-type terms accounting for hydration stresses between the adsorbed #uid and the clay minerals. In Part II the two-scale model is applied to a bentonitic clay used for engineered barrier of nuclear waste repository. The clay bu!er is assumed to have monomodal character with most of the water essentially adsorbed. Further, partial results toward a three-scale thermomechanical macroscopic model including the bulk phase next to the swelling particles are derived by homogenizing the two-scale model with the bulk water. A notable consequence of this three-scale approach is that it provides a rational basis for the appearance of a generalized inter-phase mass transfer between adsorbed and bulk water.

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Effects of inter-phase mass transfer in heated clays: A mixture theory

Cited by 29 publications

References 26 publications

Variation of some engineering properties of clays with heat treatment

Variation of some engineering properties of clays with heat treatment

Chemo-mechanical coupling in saturated porous media: elastic–plastic behaviour of homoionic expansive clays

Thermomechanical model of hydration swelling in smectitic clays: I two-scale mixture-theory approach

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