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Durability of steel FRCM-masonry joints: effect of water and salt crystallization

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Abstract

Fiber-reinforced cementitious matrix (FRCM) composites have been recently employed as a strengthening system to retrofit historic masonry structures, since they are more compatible with masonry, less subject to ageing, and compliant with conservation criteria for cultural heritage than fiber-reinforced polymer composites. However, the durability of FRCMs, such as the resistance to salt attack, has not been deeply investigated yet. In this paper, the mechanical behavior of steel FRCM strips bonded to fired-clay brick masonry blocks is studied experimentally. Single-lap shear tests are conducted in laboratory on control FRCM-masonry joints and on additional joints that underwent artificial weathering cycles in a solution of sodium sulfate decahydrate. Peak loads, slips at failure at the loaded end as well as failure modes are investigated. Pore size distribution of the constituent materials and the amount and distribution of salt within the specimens are reported and discussed in order to evaluate the transport and crystallization mechanisms of sulfate in masonry elements strengthened with externally bonded FRCM strips.

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Acknowledgements

Technicians of LISG and LASTM laboratories of DICAM Department at the University of Bologna (Italy) are gratefully acknowledged. The authors would like to express their appreciation to Kerakoll S.p.a. of Sassuolo (Italy) for providing the composite materials.

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Authors and Affiliations

  1. DICAM – Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Viale del Risorgimento 2, 40136, Bologna, Italy

    Cristina Gentilini, Mattia Santandrea, Sara Zanotto & Christian Carloni

  2. DICAM – Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Via Terracini 28, 40129, Bologna, Italy

    Elisa Franzoni

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  1. Elisa Franzoni
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  2. Cristina Gentilini
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Correspondence to Cristina Gentilini.

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Franzoni, E., Gentilini, C., Santandrea, M. et al. Durability of steel FRCM-masonry joints: effect of water and salt crystallization. Mater Struct 50, 201 (2017). https://doi.org/10.1617/s11527-017-1070-2

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