Experimental Investigation of Hydromechanical Coupling During Clay Drying

Prime, Noémie; Fraikin, Laurent; Léonard, Angélique; Charlier, Robert; Levasseur, Séverine

doi:10.1080/07373937.2015.1030030

Cited by 1 publication

(3 citation statements)

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“…This limit value is usually equal to or greater than the critical moisture content. Additionally, measurements of clay fracturing [11] show that clay cracks mainly during the first drying period. Therefore, only this period is considered in the model.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The equilibrium moisture content was approximated on the basis of Strumiłło [30] (X e ¼ 0.79%). As it was observed, [11,26,27] clay-like material shrinks the most during the first stage of drying and thus is most susceptible to cracks, so the simulations were performed for material until the limit value of moisture content below which the material does not shrink (X l ). The value of the moisture diffusion coefficient D used in calculations is estimated from Musielak and Kieca [28] and is assumed to be equal to 1.5e-7 m 2 =s.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…[1,[4][5][6] The permanent deformations were experimentally investigated and reported in the literature. [6][7][8][9][10][11] As previously stated, every fracture is initiated in material if actual stresses reach the material strength. Hence, some works are devoted to localization problems.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Numerical Simulation of Clays Cracking During Drying

Musielak

Śliwa

2015

Drying Technology

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During drying or desiccation of clay-type materials, some stresses appear. Usually they are compressional inside of the material and tensional close to the surface. If the tensional stresses exceed the material strength, the clay cracks. This article is devoted to the modeling and numerical simulation of this phenomenon. The proposed model consists of two parts. The mass transfer is described by a simple diffusion equation together with convective boundary conditions. In the mechanical part it is assumed that the clay is composed of small particles linked together by cohesive forces. These forces are described with the use of mesh models. Two models are proposed: elastic (mesh consists of springs) and viscoelastic one (mesh consists of Maxwell elements). Four types of clays were tested experimentally to obtain the model parameters. The tested materials were selected with respect to different mineralogical compositions that determine the water-bonding ability. Simulations of the convective drying of bricks made of these clays were performed. It was shown that the degree of cracking depends on the quartz content of the clay. The obtained results were compared with experimental ones and good agreement between simulations and experiment was obtained. Additionally, the inner forces caused by drying are analyzed and discussed in this work.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Numerical Simulationsmentioning

confidence: 99%