Fractal characteristics of pore structure of compacted bentonite studied by ESEM and MIP methods

Sun, Haiquan; Maš́ın, David; Najser, Jan; Neděla, Vilém; Navrátilová, Eva

doi:10.1007/s11440-019-00857-z

Cited by 50 publications

(19 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Clayey materials are preferred here for at least two reasons. First, as previously mentioned, clayey soils or rocks often show microstructural patterns that are observed in multiscale materials 37–41,68 . They exhibit a complex hierarchical organization at microstructural levels observed with space scales of several orders of magnitude, typically from nanometers to millimeters 69 .…”

Section: Applicationsmentioning

confidence: 92%

See 1 more Smart Citation

A fractional differential scheme for the effective transport properties of multiscale reactive porous media: Applications to clayey geomaterials

Cosenza

Giot

Giraud

et al. 2021

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

A new homogenization scheme is proposed to model the effects of surface phenomena occurring at the pore fluid/solid interface on the effective transport properties of multiscale and reactive geosystems, e.g., clayey geomaterials. This new scheme is a generalization of the so‐called differential scheme (DS) used to infer the effective properties of a composite made up of several materials. It is named the fractional differential scheme and is based on two key elements: (i) the concept of realizability of the DS itself and (ii) a fractional integral formulation of the DS for a porous medium considered as a two‐component composite. The formulation of the fractional DS introduces two parameters: a cementation exponent m and a fractional order α. The cementation exponent m is related to the microstructure of the material. The fractional order α accounts for the amplitude of the “surface” transport of ions resulting from the physico‐chemical interactions between hydrated cations and swelling clay minerals. Both parameters m and α are inverted from two sets of data: electrical conductivity measurements obtained on clayey rocks and effective diffusion coefficient measurements acquired from a Na‐montmorillonite geomaterial. The inversion results demonstrate that the fractional DS model is able to capture the dependence of the cation concentration on the effective transport properties of the clayey materials under study. Our results also show that the fractional order α can be considered an indirect indicator of the amplitude of physico‐chemical interactions between hydrated cations and swelling clay minerals occurring at the pore fluid/solid interface.

show abstract

Section: Applicationsmentioning

confidence: 92%

“…This construction process leads to a multiscale or “fractal‐like” microstructure constituted by a set of many inclusions of many orders of magnitude. Note that this textural or microstructural feature is typical of clayey materials 37–41 …”

Section: Introductionmentioning

confidence: 92%

A fractional differential scheme for the effective transport properties of multiscale reactive porous media: Applications to clayey geomaterials

Cosenza

Giot

Giraud

et al. 2021

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

show abstract

“…If the object is a signal, it is denoised before the fractal dimension is calculated by fractal dimension calculation methods for signals (e.g., PSD, correlation dimension and others). In addition, the fractal feature extraction of porous packaging materials can be obtained by mercury intrusion porosimetry [ 32 ] (MIP) and adsorption method [ 33 ], and then the fractal dimension can be acquired. The fractal dimension of packaging materials suitable for small-angle X-ray scattering [ 34 ] (SAXS) analysis can be obtained by the following method.…”

Section: Basic Theory Of Fractalmentioning

confidence: 99%

Review about the Application of Fractal Theory in the Research of Packaging Materials

Duan

Mao

et al. 2021

Materials

View full text Add to dashboard Cite

The work is intended to summarize the recent progress in the work of fractal theory in packaging material to provide important insights into applied research on fractal in packaging materials. The fractal analysis methods employed for inorganic materials such as metal alloys and ceramics, polymers, and their composites are reviewed from the aspects of fractal feature extraction and fractal dimension calculation methods. Through the fractal dimension of packaging materials and the fractal in their preparation process, the relationship between the fractal characteristic parameters and the properties of packaging materials is discussed. The fractal analysis method can qualitatively and quantitatively characterize the fractal characteristics, microstructure, and properties of a large number of various types of packaging materials. The method of using fractal theory to probe the preparation and properties of packaging materials is universal; the relationship between the properties of packaging materials and fractal dimension will be a critical trend of fractal theory in the research on properties of packaging materials.

show abstract

“…All samples have a bimodal pore size distribution, with two major pore sizes, which can be divided into macroscopic pores (between aggregation and aggregation) and microscopic pores (aggregated interior). The duplicate porosity feature usually also occurs when the soil samples are compressed at the optimal moisture content 43,44 .…”

Section: Mechanism Analysis Of Clay Content Effect On Mechanical Propertiesmentioning

confidence: 99%

Influence of Clay Mineral Content on the Mechanical Properties and Microfabrics of Tailings

Zhang

Pan

et al. 2021

Preprint

View full text Add to dashboard Cite

Clay mineral content has an important influence on the mechanical behavior of tailings, and the mechanical behavior of tailings directly affects the stability of tailings dams. XRF and XRD tests were carried out on tailings from three different regions. The chemical and mineral compositions of the tailings are analyzed. The strength and failure deformation of tailings were studied by carrying out laboratory triaxial compression tests. The effect of clay content on the stress path of tailings was investigated. The microfabric of tailings samples was examined with scanning electron microscopy (SEM) and nitrogen adsorption tests. The results show that the confining pressure corresponding to the samples exhibiting strain hardening increases with increasing clay mineral content in the tailings. The cohesion of tailings increases linearly, and the specific surface area decreases as the content of clay minerals increases. Nitrogen adsorption test results reveal from a microscopic point of view that changes in pore structure are associated with the content of clay minerals. The higher the content of clay minerals is, the higher the proportion of micropores (aggregated interior). Macroscopically, the overall porosity decreases and the fineness of the pores increases with clay content, which will directly affect the mechanical properties of tailings.

show abstract

Fractal characteristics of pore structure of compacted bentonite studied by ESEM and MIP methods

Cited by 50 publications

References 52 publications

A fractional differential scheme for the effective transport properties of multiscale reactive porous media: Applications to clayey geomaterials

A fractional differential scheme for the effective transport properties of multiscale reactive porous media: Applications to clayey geomaterials

Review about the Application of Fractal Theory in the Research of Packaging Materials

Influence of Clay Mineral Content on the Mechanical Properties and Microfabrics of Tailings

Contact Info

Product

Resources

About