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Evolution of the microstructure of interstratified Ca-saturated clays during dehydration: SAXS and HRTEM analysis

  • H. Ben Rhaiem (a1), D. Tessier (a2), C. H. Pons (a3) and A. Ben Haj Amara (a1)

Abstract

This paper aims at characterizing the structural and textural evolution of three mixed-layered clays in Ca-form from Southern and Central Tunisia, These samples contain various amounts of mixed-layer smectite-illite associated with crystallites of kaolinite. The clay fractions were prepared in the Ca-form and submitted to suction pressures increasing from 3.2 up to 1000 kPa. The structural and textural changes of the pastes obtained were studied by TEM and SAXS. The TEM observations and SAXS quantitative analysis on samples at low stress (3.2 kPa) showed that the thickness of the particles (number of layers per particle) and their lateral extension (in the plane of layers) decrease with increasing illite content. The textural evolution during drying, as described by SAXS, is controlled by the geometry of particles which is determined by the mineralogy of the structural units. With increasing illite content, the particles became shorter, rigid and had flat surfaces. This geometry increases their ability to associate face-to-face during dehydration. When the 2:1 fraction contains a high proportion of smectite, the architecture of the clay-water system at high water content (low stress) seems to be analogous to that of smectites. However, contrary to the behaviour of pure smectites reported in the literature, desiccation led first to a rupture of particles and a reorganization of the geometry of the pore system. This behaviour is due to the rigidity of particles caused by the presence of non-exchangeable K. The structural evolution showed that for an illite-rich sample a transition from the three-water layer to the one-water layer state occurred at 1000 kPa, whereas for smectite-rich materials, the hydration state of layers, i.e. three water layers, was not affected.

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Ben Rhaiem, H. (1983) Etude du comportement hydrique des montmorillonites calciques et sodiques par analyse de la diffi∼sion des rayons X aux petits angles. Thesis, Univ. Orléans, France.
Ben Rhaiem, H., Pons, C.H. & Tessier, D. (I987) Factors affecting the microstmcture of smectite: role of cation and applied stress. Proc. Int. Clay Conf., Denver, 292-297.
Ben Rhaiem, H., Tessier, D. & Pons, C.H. (1986) Comportement hydrique et évolution structurale et texturale des montmorillonites au cours d'un cycle de dessiccation-humectation. Partie I: cas des montmorillonites calciques. Clay Miner. 21, 9–29.
Burchill, S. & Hayes, M.H.B, (1980) Adsorption of poly (vinyl) alcohol by clay minerals. Pp. 109–121 in: Agrochemicals in Soils (Banin, A. & Kafkafi, U., editors). Pergamon, Oxford.
Drits, V.A. (1975) The structural and crystallochemical features of layer-silicates. Pp. 35–51 in: Crystallochemistry of Minerals and Geological Problems (Kossovskaya, A.G., editor). Nauka, Novosibirsk.
Drits, V.A. & Tchoubar, C. (1990) X-ray Diffraction by Disordered Lamellar Structures: Theory and Application to Microdivided Silicates and Carbons. Springer Verlag, New York, Berlin, Heidelberg.
Goldberg, S. & Glaubig, R.A. (1987) Effect of saturating cation, pH, and aluminum and iron oxide on the floculation of kaolinite and montmorilloni﹜e. Clays Clay Miner. 35, 220227.
Hetzel, F. & Doner, H.E. (1993) Some colloidal properties of beidellite: comparison with low and high charge montmorillonites. Clays Clay Miner. 41, 453460.
Hetzel, F., Tessier, D., Jaunet, A.M. & Doner, H.E. (1994) The microstructure of three Na+ smectites: the importance of the particle geometry on dehydration and rehydration. Clays Clay Miner. 42, 242–248.
Kakinoki, J. & Komura, Y. (1952) Intensity of X-ray diffraction by one dimensionally disordered crystal. J. Phys. Soc. Japan, 7, 30-35.
MacEwan, D.M.C. (1956) Fourier transform methods for studying scattering from lamellar system. I. A direct method for analysing interstratified mixtures. Koloidzeitschr. 149, 96108.
MacEwan, D.M.C. (1958) Fourier transform methods for studying scattering from lamellar system. II. The calculation of X-ray diffraction effects for various types of interstratification. Koloidzeitschr. 156, 6167.
Mering, J. (1949) Interférences des rayons X dans les systémes á interstratification désordonnée. Acta Crystallogr. 2, 371377.
Moore, D.M. & Reynolds, R.C. (1989) X-Ray Diffraction and the Identification and Analysis of Clay Minerals. Oxford University Press, Oxford, New York.
Plançon, A. (1981) Diffraction by layer containing different kinds of layers and stacking faults. J. Appl. Cryst. 14, 300304.
Pons, C.H., Ben Rhaiem, H., Tessier, D. & Clinard, C. (1987) Apport de la diffusion aux petits angles de rayons X á l‘étude de la microstructure des mathéiaux argileux. Pp. 37–4 2 in: Micromorphologie des Sols/Soil Micromorphology. (Fedomff, N., Bresson, L.M. & Courty, M.A., editors). AFES, Plaisir, France.
Pons, C.H., de la Callc, C. & Martin de Vidales, J.L. (1995) Quantification curves for XRD analysis of mixed-layer 14 Å/10 Å clay minerals. Clays Clay Miner. 43, 246254.
Pons, C.H., Tessier, D., Ben Rhaiem, H. & Tchoubar, D. (1982) A comparison between X-ray studies and electron microscopy observations of smectite fabric. Proc. Int. Clay. Conf., Bologna-Pavia, 165-186.
Reynolds, R.C. (1980) Interstratified clay minerals. Pp. 249-303 in: Crystal Structures of Clay Minerals and their X-ray Identification. (Brindley, G.W. & Brown, G., editors). Mineralogical Society, London.
Richards, L.A. (1941) A pressure-membrane extraction apparatus for soil solution. Soil Sci. 51, 377–386.
Saez-Aunon, J., Pons, C.H., Iglesias, J.E. & Rausell- Colom, J.M. (1983) Etude du gonflement des vermiculites-ornithine en solution saline par analyse de la diffusion des rayons X aux petits angles. Méthode d'interprétation et recherche des paramètres d'ordre. J. Appl. Crystallogr. 16, 439–448.
Soljic, Z. & Marjanovic-Krajovan, V. (1968) Methode rapide de dosage de SiO2, Fe2O3, Al2O3, TiO2, CaO et MgO dans une bauxite. Analyse rapide de calcaire et de dolomite. Chimie Analytique, 50, 122.
Środoń, J. & Elsass, F., (1994) Effect of the shape of fundamental particles on XRD characteristics of illitic minerals. Eur. J.. Miner. 6, 113–122.
Swartzen-Allen, S.L. & Matijevic, E. (1976) Colloid and surface properties of clay suspensions. III. Stability of montmorillonite and kaolinite. J. Coll. Interf. Sci. 56, 159167.
Tessier, D. (1984) Etude expérimentale de l'organisation des matériaux argileux. Hydratation, gonflement et structuration au cours de la dessiccation et de la réhumectation. Doc. Sci. thesis, Univ. Paris VII, France.
Tessier, D. (1990) Behaviour and microstmcture of clay minerals. Pp. 387–415 in: Soil Colloids and their Associations in Aggregates (De Boodt, M.F., Hayes, M.H.B. & Herbillon, A., editors). Plenum Press, New York.
Tessier, D. & Berrier, J. (1979) Utilisation de la microscopie électronique á balayage dans l'étude des sols. Observations des sols humides soumis á différents pF. Science du Sol, 1, 6782.
Touret, O., Ports, C.H., Tessier, D. & Tardy, Y. (1990) Etude de la répartition de l'eau dans les argiles saturées Mg2+ aux fortes teneurs en eau. Clay Miner. 25, 217233.

Evolution of the microstructure of interstratified Ca-saturated clays during dehydration: SAXS and HRTEM analysis

  • H. Ben Rhaiem (a1), D. Tessier (a2), C. H. Pons (a3) and A. Ben Haj Amara (a1)

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