Experimental Determination of the Mechanical Behaviour of Compacted Exfoliated Vermiculite

Abstract

A series of compacted exfoliated vermiculite samples were prepared, and their mechanical behaviour was experimentally studied. The vermiculite was first exfoliated and after compacted in order to obtain a material with good thermal and mechanical properties. The as-prepared samples have been tested under compressive loading. Some parameters effect was studied, as the porosity and the type of the compacted exfoliated vermiculite. The samples of this porous media display two steps for the stress-strain behaviour under uniaxial compressive loading, that is initial nonlinear deformation, strain-hardening 'pseudo-platform' stage.

Characterization and distribution of clay minerals in the soils of Fildes Peninsula and Ardley Island (King George Island, Maritime Antarctica)

“…In addition, the morphology of large plates observed in sample FP4 via SEM (Fig. 4a) is consistent with vermiculite (Campos et al ., 2009; Belhouideg & Lagache, 2014; Nguyen et al ., 2014). The excess of positive octahedral charge in smectites could also be caused by an erroneous assignment of Mg 2+ to the octahedral layer instead of the interlayer (Newman & Brown, 1987; Christidis, 2011).…”

“…In addition, the morphology of large plates observed in sample FP4 via SEM (Fig. 4a) is consistent with vermiculite (Campos et al ., 2009; Belhouideg & Lagache, 2014; Nguyen et al ., 2014).…”

Modeling and numerical simulation of fluid flow in a porous tube with parietal suction

“…The fluid used for simulation is the air, whose main characteristics are recalled in Table 1. The porous wall is made of the compacted exfoliated clay [1,22], whose its permeability is equal to 1.85×10 -17 m 2 [23].…”

“…Porous media are widely used and play an important role in many industrial sectors and natural phenomena. These include, as typical examples: petroleum engineering, chemical engineering, hydrogeology, civil engineering, medicine... By their implication in these various areas and phenomena, porous media have been intensively studied during the past 50 years, and constitute a separate discipline in many field researches [1][2][3]. The geometric areas containing porous borders are important domains in physics.…”

Characterization and classification of clay minerals for potential applications in Rugi Ward, Kenya

“…The high charge per formula unit gives vermiculite a high cation exchange capacity and causes this clay type to have a high affinity of weakly hydrated cations such as K + , NH 4 + and Cs + . Upon rapid heating at a temperature of 900°C or higher, the water in raw flakes vermiculite flashes into steam and the flakes expand into accordion-like particles (Hillier, 2013), a phenomenon known as exfoliation (Belhouideg and Lagache 2014). The expanded or exfoliated material is low in density, chemically inert and adsorbent has excellent thermal and acoustic insulation properties, is fire resistant and odourless.…”