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Influence of the pozzolanic fraction obtained from vitrified bottom-ashes from MSWI on the properties of cementitious composites

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Abstract

Municipal Solid Waste Incineration Bottom Ashes (MSWI BA) have been submitted to a thermal treatment leading to their complete vitrification. The composition and the pozzolanic activity of the vitrified, grounded bottom ashes is evaluated, as far as the mechanical and microstructural properties of mortars containing up to 30 wt.% of this fraction (on cement weight), as a replacement of the hydraulic binder. At sufficiently long curing times, modified composites exhibit higher mechanical strengths and lower porosity than those of the unmodified ones. The same mortars show lower permeation to chlorides and sulphates and the tendency to depress the expansion generated by alkali-silica reactions (ASR).

Résumé

Les mâchefers ont été soumis à un traitement thermique qui a conduit à leur vitrification complète. La composition et l'activité pouzzolanique des mâchefers vitrifiés et moulus ont été étudiées, de même que les propriétés mécaniques et la microstructure de mortiers contenant jusqu'à 30% de cendres (en poids de ciment), en remplacement du liant. Après un mûrissement suffisamment long, les matériaux composites modifiés montrent de meilleures propriétés mécaniques et une plus faible porosité que les mortiers conventionnels. Ces mortiers montrent également une plus faible perméabilité aux sulfates et chlorures et une tendance à diminuer l'expansion causée par les réactions alcali-silice.

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Authors and Affiliations

  1. Dipartimento Chimica Applicata e Scienza dei Materiali, University of Bologna, Bologna, Italy

    A. Saccani & F. Sandrolini

  2. Dipartimento di Ingegneria Ambiantale e dei Materiali, University of Modena and Reggio Emilia, Modena, Italy

    F. Andreola, L. Barbieri, A. Corradi & I. Lancellotti

Authors
  1. A. Saccani
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  2. F. Sandrolini
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  3. F. Andreola
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  4. L. Barbieri
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  5. A. Corradi
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  6. I. Lancellotti
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Saccani, A., Sandrolini, F., Andreola, F. et al. Influence of the pozzolanic fraction obtained from vitrified bottom-ashes from MSWI on the properties of cementitious composites. Mat. Struct. 38, 367–371 (2005). https://doi.org/10.1007/BF02479303

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  • DOI: https://doi.org/10.1007/BF02479303

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