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Behavior and modeling of strengthened three-leaf stone masonry walls

Abstract

The application of three different intervention techniques on three-leaf rubble stone masonry walls are discussed here. Injections, repointing, and the placing of ties connecting the two external whytes were considered, both singularly and in combination. Lime-based products were chosen for injection grouts and repair mortars, to ensure better compatibility with the original materials. The experimental tests, performed on seventeen large scale samples under compressive loads, showed that: (i) injections are very effective to improve the mechanical characteristics of the walls; (ii) the other techniques have less influence on the strength but can operate in avoiding ‘brittle’ failure modes (ties placing) and in improving the durability of the masonry (repointing); (iii) the combination of the techniques ensures the enhancement of the global behavior of the walls. The integration of the experimental results with data available in literature allowed the calibration of an analytical model able to predict the compressive strength of injected walls, based on parameters given by simple experimental tests.

Résumé

Dans cet article, nous allons observer l'application de trois différentes techniques d'intervention sur des murs de trois couches en maçonnerie de pierres. Les injections, le remplissage des joints horizontaux de mortier et le positionnement des épingles qui relient les deux couches extérieures ont été pris en considération à la fois individuellement et ensemble. Des produits à base de chaux ont été choisis pour les injections de coulis et les mortiers de réparation, afin d'assurer une meilleure compatibilité avec les matériaux d'origine. Les tests expérimentaux effectués sur dix-sept échantillons à grande échelle sous l'action de poids comprimant, ont montré que: (i) les injections améliorent considérablement les caractéristiques mécaniques des murs; (ii) les autres techniques influencent moins la résistance mais elles peuvent opérer en évitant les modes d'éches ‘fragile’ (avec le positionnement des chaînes) et en améliorant la durabilité de la maçonnerie (remplissage des joints); (iii) la combinaison des techniques assure l'amélioration globale du comportement des murs. L'intégration des résultats expérimentaux avec les données disponibles en littérature ont permis de calibrer un modèle analytique capable de prévoir la force de compression des murs injectés, fondée sur les paramètres résultant de simples tests expérimentaux.

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Editorial note Prof. Claudio Modena is a RILEM Senior Member. He participates in RILEM TC 177-MDT ‘Masonry durability and on-site testing’.

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Valluzzi, M.R., da Porto, F. & Modena, C. Behavior and modeling of strengthened three-leaf stone masonry walls. Mat. Struct. 37, 184–192 (2004). https://doi.org/10.1007/BF02481618

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  • DOI: https://doi.org/10.1007/BF02481618

Keywords

  • Compressive Strength
  • External Layer
  • Masonry Wall
  • Masonry Building
  • Stone Masonry