PSI - Issue 44

Giuseppe Bramato et al. / Procedia Structural Integrity 44 (2023) 2302–2309 Author name / Structural Integrity Procedia 00 (2022) 000–000

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observed for FRCM coupons. In fact, in Fig. 10, shear bond test results are reported considering the two different mortars used: cementitious (Fig. 10b) and lime-based (Fig. 10a). The average shear bond strength was 819.20 MPa and 1048.74 MPa in case of lime-mortar and cementitious mortar, respectively while the ratio between the ultimate bond strength and the tensile strength of the FRCM is 1.1548 for cementitious mortar and 1.0393 in the case of lime base. Probably in shear bond test, the presence of substrate improves the mechanical behavior of FRCM (Lignola et al 2017). However, the present investigations have to be considered as a preliminary study which need to be strengthen in order to support the results. 5. Conclusions The present paper reports a part of a larger experimental campaign aimed to study the mechanical behavior of FRCM made by an open mesh basalt grid and two different mortars (lime-based and cementitious) in terms of tensile capacity and interface transfer mechanism. For this purpose, two different substrates, representative of the Southern Italy building heritage, and two different mortars (lime-based and cementitious) were used with the same open grid mesh. On the basis of the recorded data and taking into account that the analysis is still in progress the following conclusions can be drawn: • The failure mode strongly influenced the effectiveness of the strengthening system; • The mechanical properties of the inorganic matrix influenced the performance of the reinforcement. In fact, mortar with high performances allowed to reach higher level of both tensile and shear-bond strength; • The substrate did non influence the experimental results. Acknowledgements The study object of this test was founded by the Italian Ministry of Education, University and Research in the framework of PRIN 2017 – SURMOUNT (Innovative systems on inorganic mortar non-metallic reinforcement for the upgrade of masonry structures and non-structural elements). The authors would acknowledge also Mapei s.p.a. References E. UNI, Metodi di prova per pietre naturali–Determinazione della resistenza a compressione uniassiale, 2007. [In Italian] E. UNI, 1015-11. Metodi di prova per malte per opere murarie - Determinazione della resistenza a flessione e a compressione della malta indurita, 2007. [In Italian] dei Lavori Pubblici, C. S. (2018). Linea Guida per la identificazione, la qualificazione ed il controllo di accettazione di compositi fibrorinforzati a matrice inorganica (FRCM) da utilizzarsi per il consolidamento strutturale di costruzioni esistenti. [In Italian] EN ISO 13934_1:2013. Textiles — Tensile properties of fabrics — Part 1: Determination of maximum force and elongation at maximum force using the strip method. CNR. (2018). CNR-DT 215/2018 Istruzioni per la Progettazione, l’Esecuzione ed il Controllo di Interventi di Consolidamento Statico mediante l’utilizzo di Compositi Fibrorinforzati a Matrice Inorganica. CNR: Consiglio Nazionale Delle Ricerche . [In Italian] Lignola, G. P., Caggegi, C., Ceroni, F., De Santis, S., Krajewski, P., Lourenço, P. B., Morganti, M., Papanicolaou, C. (Corina), Pellegrino, C., Prota, A., & Zucca-rino, L. (2017). Performance assessment of basalt FRCM for retrofit applications on masonry. Composites Part B: Engineering , 128 , 1–18. https://doi.org/10.1016/j.compositesb.2017.05.003 Leone, M., Micelli, F., Aiello, M. A., & Cascardi, A. (2020). Masonry elements reinforced with FRCM: Bond behaviour. In Brick and Block Masonry-From Historical to Sustainable Masonry (pp. 646-652). CRC Press. Leone, M., Aiello, M. A., Balsamo, A., Carozzi, F. G., Ceroni, F., Corradi, M., ... & Mazzotti, C. (2017). Glass fabric reinforced cementitious matrix: Tensile properties and bond performance on masonry substrate. Composites Part B: Engineering, 127, 196-214. Cascardi, A., Longo, F., Micelli, F., & Aiello, M. A. (2017). Compressive strength of confined column with Fiber Reinforced Mortar (FRM): New design-oriented-models. Construction and Building Materials , 156 , 387-401. Cascardi, A., Micelli, F., & Aiello, M. A. (2018). FRCM-confined masonry columns: experimental investigation on the effect of the inorganic matrix properties. Construction and Building Materials, 186, 811-825. Cascardi, A., Aiello, M. A., and Triantafillou, T. (2017a). “Analysis-oriented model for concrete and masonry confined with fiber reinforced mortar.” Materials and Structures/Materiaux et Constructions , Springer Netherlands, 50(4), 1–15. Bilotta, A., Ceroni, F., Lignola, G. P., & Prota, A. (2017). Use of DIC technique for investigating the behaviour of FRCM materials for strengthening masonry elements. Composites Part B: Engineering , 129 , 251-270. V. Rizzo (2019) “Bond Behaviour and Durability in Alkaline Environments of Composite Strengthening Systems” Thesis for PhD in Materials, Structures and Nanotechnologies Engineering - XXXII Cycle Academic year 2016- 2019 Bramato, G., Leone, M., Perrone, D., & Aiello, M. A. (2022). Experimental study on bond between basalt FRCM reinforcement and calcareous stone. Rehabend 2022, 9 th Euro-American Congress on Construction Pathology, Rehabilitation Technology and Heritage Management (in progress).