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Effect of calcium lignosulfonate on tricalcium aluminate and its hydration products

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Abstract

In the tricalcium aluminate—calcium lignosulfonate—water system, evidence has been obtained for the formation of a complex and precipitation of a highly basic calcium lignosulfonate. The hexagonal calcium aluminate hydrate as well as the cubic aluminate hydrate irreversibly adsorb calcium lignosulfonate. Adsorption results in changes of surface area, morphology, thermal behaviour and rate of interconversions.

Résumé

L'influence du lignosulfonate de calcium (CLS) sur C3A, C4AHn−C2AHn et C3AH6 a été étudiée en milieu aqueux. Il n'est pas possible d'obtenir un isotherme d'adsorption dans le système C3A-CLS-H2O. A de plus faibles concentrations de CLS il se forme un complexe, et aux hautes concentrations un précipité dû à la formation de CLS alcalin. Il est possible d'obtenir des isothermes d'adsorption dans les systèmes C4AHn−C2AHn-CLS-H2O et C3AH6-CLS-H2O. Les phases cubiques et hexagonales adsordent irréversiblement le CLS dans des proportions respectives de 10 et 2%, à une concentration d'équilibre de 0,15 g/100 ml. L'adsorption entre les couches et la dispersion déterminent un accroissement de surface. On a aussi observé des modifications morphologiques, ainsi que des variations de pH et des caractéristiques thermiques, dues à la migration du CLS dans les aluminates.

On propose de modifier la tendance actuelle d'attribuer l'action retardatrice du CLS à l'adsorption par la phase C3A en faveur de «l'épuisement du CLS par les produits d'hydratation de l'aluminate tricalcique».

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Authors and Affiliations

  1. Materials Section, Division of Building Research, National Research Council of Canada, Ottawa, Canada

    V. S. Ramachandran & R. F. Feldman (Research Officer)

Authors
  1. V. S. Ramachandran
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  2. R. F. Feldman
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Additional information

The information in this paper was presented at the Second Cement Symposium held as part of the 73rd Annual Meeting of the American Ceramic Society, Chicago, April 1971.

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Ramachandran, V.S., Feldman, R.F. Effect of calcium lignosulfonate on tricalcium aluminate and its hydration products. Mat. Constr. 5, 67–76 (1972). https://doi.org/10.1007/BF02478435

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