X-ray diffraction and adsorption isotherm studies of the calcium montmorillonite-H2O system

Senich, Donald; Demirel, T; Handy, Richard L.

doi:10.31274/rtd-180813-2894

Cited by 4 publications

(5 citation statements)

References 34 publications

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“…The mass change isotherms for cement paste, 1.4 nm tobermorite and Ca-montmorillonite are depicted in Figure 2 humidities (<<7%) [33]. Further evidence that the hysteresis observed for our specimens is real is the existence of 'scanning loops' extending into the lower humidity regions.…”

Section: Mass Change Isothermsmentioning

confidence: 55%

“…One explanation for reversible adsorption would be that the layered structure would not open up making intercalation negligible. This would be surprising and contrary to observations of a significant increase in Xray basal spacing on wetting Ca-montmorillonite [33,38]. There is, however, not universal agreement on this issue as some numerical simulations would indicate [39].These simulations, however, were focused on stability of Ca-montmorillonite at high temperatures and pressures.…”

Section: Mass Change Isothermsmentioning

confidence: 76%

“…Measurements could not be made 15/34 beyond this point. The X-ray basal spacing of Ca montmorillonite from two well known sources [5,33] increases from about 0.95 to 1.47 nm on wetting and has been shown to be irreversible in the adsorption region of the isotherm. It was reported that for these samples two layers of water resided in the interlayer.…”

Section: /34mentioning

confidence: 99%

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Dimensional change and elastic behavior of layered silicates and Portland cement paste

Beaudoin

Raki

Alizadeh

et al. 2010

Cement and Concrete Composites

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10. 1016/j.cemconcomp.2009.09.004 Cement and Concrete Composites, 31, 9, p. 34, 2009-09-01 Dimensional change and elastic behaviour of layered silicates and Portland cement paste Beaudoin, J. J.; Raki, L.; Alizadeh, R.; Mitchell, L. D. ABSTRACTThe role of water in hydrated Portland cement paste (hpc) is germane to understanding the nature of nanostructure -property relationships of the material. The irreversible dimensional changes of hpc and phase pure C-S-H that occur on wetting and drying are dissimilar to those observed for other silicate minerals of interest to cement science. This irreversibility in hpc is also observed for the modulus of elasticity parameter. Length change, mass change and modulus of elasticity isotherms (including drying-wetting cycles) were determined for specimens of hpc, Camontmorillonite and 1.4 nm tobermorite. Length change and modulus of elasticity versus mass loss curves were also obtained for phase pure C-S-H (C/S= 0.8,1.0 and 1.5). All the isotherms exhibit significant irreversible behaviour. Similarities and differences in the nature and character of the isotherms and the relevance of the C-S-H data are discussed. Inferences are made with respect to the nanostructural nature of hpc, its dimensional response in aqueous media and the correspondence in behaviour of synthetic C-S-H and that formed in hpc. It is apparent that hpc has unique characteristics that are responsible for stability.

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Section: Mass Change Isothermsmentioning

confidence: 55%

Section: Mass Change Isothermsmentioning

confidence: 76%

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Dimensional change and elastic behavior of layered silicates and Portland cement paste

Beaudoin

Raki

Alizadeh

et al. 2010

Cement and Concrete Composites

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“…When the pore fluid is water, it is believed that aggregates of parallel particles, termed domains (Emerson, 1959;Aylmore and Quirk, 1959), are formed for smectite and possibly for illite as well. In the case of calcium smectite the water is adsorbed between the layers until the basal spacing is about 19 ,~ (Norrish, 1954;Senich, Demirel and Handy, 1967) and then adsorption stops. Since the layers cannot swell sufficiently to form diffuse double layers, it is believed that domains of perhaps eight to ten layers form (Blackmore and Miller, 1961) with larger voids between the domains.…”

Section: Physico-chemical Variablesmentioning

confidence: 99%

Mechanisms Controlling the Permeability of Clays

Mesri

1971

Clays and clay miner.

446

175

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Abstract-Coefficients of permeability, calculated using Terzaghi's theory of one-dimensional consolidation, are reported for smectite, illite, and kaolinite, in water, methyl and ethyl alcohol, benzene, and carbontetrachloride. When the pore fluid was water the clays were homoionized to either the sodium or calcium form and the pore water electrolyte concentratioa was varied. The coefficients of permeability are evaluated in terms of both mechanical and physico-chemical variables. It appears that the coefficients of permeability are mainly influenced by mechanical effects, particularly the distribution of void sizes and the tortuosity of the channels. The coefficient of permeability is maximized if the flow channels consist of many small channels and a relatively few large ones, through which the main flow occurs. Physico-chemical variables exert great influence on the coefficient of permeability through their influence on dispersion or aggregation of the clay particles.

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“…A further argument in favor of the concept of time-dependent bonds in the adsorbed water, is the energy of adsorption of water to mineral surfaces. Senich et al (1967) showed that expansion energies exerted by a calcium montmorillonite-water system are 2 2 of the order of 440 kg/cm at zero separation and 40 kg/cm at a separation due to Lour layers of water. Since even the latter value is relatively high compared to most natural or applied pressures on soils, it is doubtful that any direct mineral-to-mineraL contact really exists in clay soils at any but the lowest moisture contents.…”

Section: Physico-chemical Conceptsmentioning

confidence: 99%

Effect of temperature on strength of soils

Noble

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X-ray diffraction and adsorption isotherm studies of the calcium montmorillonite-H2O system

Cited by 4 publications

References 34 publications

Dimensional change and elastic behavior of layered silicates and Portland cement paste

Dimensional change and elastic behavior of layered silicates and Portland cement paste

Mechanisms Controlling the Permeability of Clays

Effect of temperature on strength of soils

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