PSI - Issue 47

Andrea Zanichelli et al. / Procedia Structural Integrity 47 (2023) 37–42 Zanichelli et al. / Structural Integrity Procedia 00 (2023) 000–000

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Fig. 4. Microstructural images of both the PM sample (a) and the GOM sample (b).

5. Conclusions In the present paper, the mechanical and fracture properties of a plain mortar reinforced with 0.03% of GO have been experimentally investigated. A microstructural analysis has been also performed. It has been found that GO addition has a limited influence on the examined mechanical properties, whereas a significant influence on the fracture toughness. The hydration products morphology is not significantly influenced by the GO addition, with the exception of the Ca-rich silicate crystals, characterized by a more compact shape when GO is added to the cement paste. Acknowledgements The work of Camilla Ronchei, Andrea Zanichelli and Sabrina Vantadori is supported by Italian Ministry of University and Research (P.R.I.N. National Grant 2020, Project code 2020EBLPLS; University of Parma Research Unit). References ASTM C348-2014, (American Standard Test Method). Standard Test Method for Flexural Strength of Hydraulic-Cement Mortars. West Conshohocken, PA: ASTM; 2014. Carpinteri, A., Berto, F., Fortese, G., Ronchei, C., Scorza, D., Vantadori, S., 2017. Modified two-parameter fracture model for bone. Engineering Fracture Mechanics 174: 44-53. Gaboardi, M., Tatti, R., Bertoni, G., Magnani, G., Della Pergola, R., Aversa, L., Verucchi, R., Pontiroli, D., Riccò, M., 2020. Platinum carbonyl clusters decomposition on defective graphene surface. Surface Science 691: art. no. 121499. Jinchang, P., Yeming, W., 2018. Graphene oxide on the microstructure and mechanical properties of cement based composite material. Frattura ed Integrita Strutturale 12: 156-163. Lin, C., Wei, W., Hu, Y.H., 2016. Catalytic behavior of graphene oxide for cement hydration process. Journal of Physics and Chemistry of Solids 89: 128-133. Lv, S., Liu, J., Sun, T., Ma, Y., Zhou, Q., 2014. Effect of GO nanosheets on shapes of cement hydration crystals and their formation process. Construction and Building Materials 64: 231-239. Pan, Z., He, L., Qiu, L., Korayem, A.H., Li, G., Zhu, J.W., Collins, F., Li, D., Duan, W.H., Wang, M.C., 2015. Mechanical properties and microstructure of a graphene oxide-cement composite. Cement and Concrete Composites 58: 140-147. RILEM Technical Committee, 50-FMC, 1985. Determination of the fracture energy of mortar and concrete by means of three-point bend test on notched beams, proposed RILEM draft recommendations. Mater Struct 18: 285–290. RILEM Technical Committee, 89-FMT, 1990. Determination of fracture parameters (KsIC and CTODc) of plain concrete using three-point bend

tests, proposed RILEM draft recommendations. Mater Struct 23: 457–460. UNI 9156:2015. Sulphates resistant cements – Classification and composition. UNI EN 197-1:2011. Cement – Part 1: Composition, specifications and conformity criteria for common cements.