The Structural Status of Clay Systems

Aylmore, L. A. G.

doi:10.1346/ccmn.1960.0090107

Cited by 64 publications

(29 citation statements)

References 23 publications

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“…Some parallel condensation of the Ca-illite particles to form domains may exist (Aylmore and Quirk, 1962). This phenomenon is unlikely even for Cs-illite inasmuch as Greene et al (1978) were not able to obtain evidence for domain formation in Ca-illite suspensions.…”

Section: Particle Condensationmentioning

confidence: 98%

Surface Potentials Derived from Co-Ion Exclusion Measurements on Homoionic Montmorillonite and Illite

Chan

1984

Clays and clay miner.

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Abstract-Simple equations are presented which allow double-layer potentials of clays to be derived from co-ion exclusion measurements in monovalent and divalent electrolyte solutions. These equations have been used to re-interpret earlier results for illite and montmorillonite. The potentials derived follow the lyotropic series for the various homoionic modification of each clay. We have demonstrated that the Schofield equation, which assumes high double-layer potentials, cannot be applied to co-ion exclusion in clay systems. Re-analysis of earlier measurements has shown that for a given homoionic clay the potentials are almost independent of concentration over the range 0.3 to 0.003 molar. Thus, clay surfaces appear to behave more like constant-potential than constant-charge surfaces.

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Section: Particle Condensationmentioning

confidence: 98%

Surface Potentials Derived from Co-Ion Exclusion Measurements on Homoionic Montmorillonite and Illite

Chan

1984

Clays and clay miner.

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“…Ca-montmorillonite, for example, does not swell to the same extent as Namontmorillonite [26,27]. Illite crystals, unlike montmorillonite, do not swell appreciably [28]. Hence swelling in illitic material due to the uptake of water results from the separation of crystals themselves i.e.…”

Section: Swelling Clay-c-s-h Analogues For Expansive Behaviormentioning

confidence: 99%

A comparative study of the volume stability of C–S–H (I) and Portland cement paste in aqueous salt solutions

2007

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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/10.1007/s10853-006-1328-5 Science, 42, 16, pp. 6837-6846, 2007-08-01 A Comparative study of the volume stability of C-S-H (I) and Portland cement paste in aqueous salt solutions Dramé, H.; Beaudoin, J. J.; Raki, L. Journal of Materialshttp://irc.nrc-cnrc.gc.ca A Comparative study of the volume stability of C-S-H(I) and Portland cement paste in aqueous salt solutions NRCC-45612Dramé, H.; Beaudoin, J.J.; Raki, L.A version of this document is published in / Une version de ce document se trouve dans: Journal of Materials Science, v. 42, no. 16, August 2007, pp. 6837-6846 Doi: 10.1007/s10853-006-1328 The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. Similarities were observed between the length change behavior of compacted C-S-H (I) and the swelling of smectite clays in contact with these osmotic media. The similarities are compatible with explanations of expansion provided by both the osmotic and the electrical double layer (EDL) theories. The relationship between the expansive behavior of C-S-H and both Na and Ca Montmorillonite in contact with aqueous salt solutions is discussed extensively in the context of its significance in cement science.

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“…Aylmore and Quirk (1962) reported that the swelling of Ca-illite was insensitive to electrolyte concentration over the range from 4 M to distilled water. They attributed this limited intercrystalline swelling to the existence of a potential m i n i m u m between the contiguous clay crystals in an assemblage of near-parallel, aligned clay particles, described as a domain.…”

Section: Introductionmentioning

confidence: 99%

Crystalline Swelling of Smectite Samples in Concentrated NaCl Solutions in Relation to Layer Charge

Slade

Quirk

Norrish

1991

Clays and clay miner.

143

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Abstrael--The basal spacing of a set of smectites, with layer charges between 0.74 and 1.14 electrons per unit cell, have been measured while the smectites were in equilibrium with NaCI solutions having concentrations of 0.25 to 2.5 molal. Except for the most highly charged smectites, an expansion from 15.5 to ~ 18.5 ~ occurred as the NaC1 concentrations were reduced. This expansion (or "crystalline swelling") corresponds to the transition from two to three sheets of water between the silicate layers. A random interstratification of 15.5 and 18.5 ~k structure units was present during the change and gave rise to broad diffraction peaks for the 001 reflections. A balance between cation hydration forces, interlamellar electrostatic forces, and van der Waals forces was apparently the basis of the relationship between surface charge and swelling. The results can be expressed in terms of the relative vapor pressures at which the transitions were half complete; these pressures increased with surface density of charge, and over the range of surface charge studied, the P/P~ values ranged from 0.943 to 0.974.

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The Structural Status of Clay Systems

Cited by 64 publications

References 23 publications

Surface Potentials Derived from Co-Ion Exclusion Measurements on Homoionic Montmorillonite and Illite

Surface Potentials Derived from Co-Ion Exclusion Measurements on Homoionic Montmorillonite and Illite

A comparative study of the volume stability of C–S–H (I) and Portland cement paste in aqueous salt solutions

Crystalline Swelling of Smectite Samples in Concentrated NaCl Solutions in Relation to Layer Charge

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