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Expansive cement blend for use in shrinkage-compensating mortars

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Abstract

To reduce the size and amount of shrinkage cracks that frequently occur in Portland cement concrete, expansive cements have been developed, namely sulfoaluminate-type cements. These cements are increasingly used for the repair of concrete structures.

This paper reports an approach to general concepts associated with sulfoaluminate-type cements. The procedure for mix proportioning of the calcium sulfoaluminate cement blend using kaolin as a source of aluminates is described and the results of an experimental investigation of the behaviour of expansive cement mortars with respect to expansion and strength characteristics are presented. The hydrated crystalline products are also identified.

Résumé

Afin de réduire les dimensions et le nombre des fissures de retrait qui se produisent souvent dans le béton à base de ciment Portland, des ciments expansifs ont été développés. Ce sont des ciments de type sulfoaluminate, de plus en plus souvent utilisés pour la réparation des ouvrages en béton.

Cet article présente une approche aux concepts généraux associés aux ciments de type sulfoaluminate. On décrit le procédé de dosage d’un ciment composé à base de sulfoaluminate de calcium, ainsi que les résultats d’une étude expérimentale du comportement des mortiers de ciment expansif, en ce qui concerne leur expansion et leur résistance. Les produits cristallins hydratés ont également été identifiés.

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Authors and Affiliations

  1. Concrete and Binders Division of the Building Materials Department of the Laboratório Nacional de Engenharia Civil, Lisbon, Portugal

    Maria Sofia Sousa Ribeiro (Civil Engineer, Research Assistant)

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  1. Maria Sofia Sousa Ribeiro
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Editorial Note Maria Sofia Sousa Ribeiro works at LNEC (Laboratório Nacional de Engenharía Civil), Lisbon, Portugal, a RILEM Titular Member.

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Sousa Ribeiro, M.S. Expansive cement blend for use in shrinkage-compensating mortars. Mat. Struct. 31, 400–404 (1998). https://doi.org/10.1007/BF02480713

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  • DOI: https://doi.org/10.1007/BF02480713

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