PSI - Issue 72

Ivelina Ivanova et al. / Procedia Structural Integrity 72 (2025) 338–344

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Fig. 9. Modes of failures

4. Conclusions Within this theme, over the years a range of natural fibers have been investigated, to better understand their mechanical performance. This experimental research approach provided a better understanding of the mechanical behavior and the effect of different layers. The results showed an increase ultimate load from 48,5% in flexural strength of specimen strengthened directly placed in the formwork compared to the control specimen without strengthening. The reinforcing with a single layer at the bottom of the specimen (F0) is of particular importance for delaying the bending crack and increasing the ultimate load. Acknowledgements The authors gratefully acknowledge the financial support from, the University of Reims Champagne Ardenne and Assih, J. and Ivanova, I., 2021. Experimental and analytical study of bio-based epoxy composite materials for strengthening reinforced concrete structures, Science and Engineering of Composite Materials 28(1) 335–342, https://doi.org/10.1515/secm-2021-0024 Awwad, E., Mabsout, M., Hamad, B., Farran, M.T., Khatib H., 2012. Studies on fiber-reinforced concrete using industrial hemp fibers, Construction and Building Materials 35, 710-717, https://doi.org/10.1016/j.conbuildmat.2012.04.119 Ben Hammed Z., Sabeur H., Ben Ouezdou M., 2021. Formulation de béton à base de fibre végétale tunisienne (ALFA), JOURNEES NATIONALES DU BETON JNB’21 - Hammamet 21, 22 et 23mai 2021 Bou Abdallah, G., Ivanova, I., Assih, J., Diagana C., and Dontchev, D., 2022. Mechanical behavior of strengthened reinforced concrete beams an experimental study, IOP Conference Series: Materials Science and Engineering 1252, 012051 Bou Abdallah, G., Diagana, C., Assih, J., Titeux-Peth, I., Ivanova, I., and Dontchev, D., 2022. Strengthening of structures by composite materials based on jute and flax fibers, Academic Journal of Civil Engineering 40(1), 211-214 Bou Abdallah, G., Ivanova, I., Assih, J., Diagana C., and Dontchev, D., 2022. Composite materials based on natural fibers applied for structural reinforcement, IOP Conference Series: Earth and Environmental Science 960(1), 012007, DOI 10.1088/1755-1315/960/1/012007 Çomak, B., Bideci, A., Bideci, Ö. S., 2018. Effects of hemp fibers on characteristics of cement-based mortar, Construction and Building Materials 169, 794-799, https://doi.org/10.1016/j.conbuildmat.2018.03.029 Ivanova, I., Assih, J. and Dontchev, D., 2021. Investigation of the Mechanical Behavior of Natural Vegetable Fibers Used in Composite Materials for Structural Strengthening, Key Engineering Materials, 888:15-21, DOI: 10.4028/www.scientific.net/KEM.888.15 Ivanova, I., Assih, J. and Dontchev, D., 2020. Application of natural fiber composite materials in the strengthening of reinforced concrete structures", „IOP Conference Series: Materials Science and Engineering, 951 012012, DOI:10.1088/1757-899X/951/1/012012 More, F.M.D.S., Subramanian, S.S., 2022. Impact of Fibres on the Mechanical and Durable Behaviour of Fibre-Reinforced Conc-rete. Buildings 12, 1436. https://doi.org/10.3390/buildings12091436 Nayak, J.R., Bochen, J., Gołaszewska, M., 2022. Experimental studies on the effect of natural and synthetic fibers on properties of fresh and hardened mortar, Construction and Building Materials 347, 128550, https://doi.org/10.1016/j.conbuildmat.2022.128550 Özodabaş A., 2023. Reinforcement of cementitious m ortars with hemp fibers and shives, Open Chemistry 21: 20220335, https:// doi.org/10.1515/chem-2022-0335 ITHEMM. References