The restoration of the load-bearing capacity of RC beams through crack injection is one of the most efficient and practical methods for executing repairs in the field of civil engineering. In the article, following an analysis of crack injection methods in RC structures, an economically viable method for injecting RC beams is proposed. The core approach of the proposed crack injection method involves the process of introducing epoxy resin into the crack, which occurs by gravity flow (without specialized equipment and pressure). The paper outlines a systematic process for preparing the crack in the RC beam for epoxy resin injection. The crack injection method was conducted comprehensively, including the restoration of the compressed concrete zone within the RC beam. The test results demonstrated the effectiveness of the crack injection method, as there were no new crack formations at the injection sites, and the load-bearing capacity of the RC beam was restored to 115%.

Akram, A.(2021).The Overview of Fracture Mechanics Models for Concrete. Architecture, Civil Engineering, Environment,14(1) 47-57.
Al-Sulaimani, A. A. A., Al-Sulaimani, H. E., & Al-Sulaimani, A. H. (2022). Repair of reinforced concrete beams with injecting nanocomposites. Journal of Building Engineering, 38, 103560. doi:10.1016/j.jobe.2022.103560
Bobalo, T., Blikharskyy, Y., Kopiika, N., & Volynets, M. (2020). Serviceability of RC beams reinforced with high strength rebar's and steel plate. In Proceedings of CEE 2019: Advances in Resource-saving Technologies and Materials in Civil and Environmental Engineering 18 (pp. 25-33). Springer International Publishing. doi:10.1088/1757-899X/708/1/012045
Carino, N. J., & Clifton, J. R. (1995). Prediction of cracking in reinforced concrete structures. Gaithersburg, MD, USA: US Department of Commerce, National Institute of Standards and Technology.
Golewski GL. The Phenomenon of Cracking in Cement Concretes and Reinforced Concrete Structures: The Mechanism of Cracks Formation, Causes of Their Initiation, Types and Places of Occurrence, and Methods of Detection-A Review. Buildings. 2023; 13(3):765.
Gupta, A. K., & Akbar, H. (1984). Cracking in reinforced concrete analysis. Journal of Structural Engineering, 110(8), 1735-1746.
Issa, C. A., & Debs, P. (2007). Experimental study of epoxy repairing of cracks in concrete. Construction and Building Materials, 21(1), 157-163.
Karpiuk, V., Somina, Y., & Maistrenko, O. (2020). Engineering method of calculation of beam structures inclined sections based on the fatigue fracture model. In Proceedings of CEE 2019: Advances in Resource-saving Technologies and Materials in Civil and Environmental Engineering 18 (pp. 135-144). Springer International Publishing.
Kim, J.-W., Lee, J.-H., Lee, S.-H., Kim, M.-H., & Kim, K.-S. (2022). Influence of injection pressure on the effectiveness of epoxy resin injection repair of concrete beams with cracks. Journal of Structural Engineering, 148(5), 04022088. doi:10.1061/(asce)st.1943-541x.0002967
Li, Y., & Li, X. (2023). Repair methods for cracks in reinforced concrete structures: A review. Construction and Building Materials, 309, 126798. doi:10.1016/j.conbuildmat.2022.126798
Liu, X., & Wang, Y. (2023). Crack formation in reinforced concrete structures: A numerical study. Engineering Structures, 251, 112686. doi:10.1016/j.engstruct.2022.112686
Ma, M. L., Wu, A. C., Chen, J. C., Chen, C. Y., & Wang, A. J. (2019). Repair of shear cracks in reinforced concrete beams using a novel fiber-reinforced polymer injection system. Construction and Building Materials, 218, 1165-1174. doi:10.1016/j.conbuildmat.2019.03.048
Pathak, S. S., & Vesmawala, G. R. (2022). Influence of TiO2 and fly ash on fracture parameters of concrete notched beams. Journal of Advanced Concrete Technology, 20(10), 624-639.
Saliah, S. N. M., Nor, N. M., Abd Rahman, N., Abdullah, S., & Tahir, M. S. (2021). Evaluation of severely damaged reinforced concrete beam repaired with epoxy injection using acoustic emission technique. Theoretical and Applied Fracture Mechanics, 112, 102890.
Sika MonoTop®-4012,
Sikadur®-52 Injection Normal,
Sylovaniuk, V., Revenko, A., & Lisnychuk, A. (2015). On Short-Term and Long-Term Strength of Restored Building Structure Elements Using Injection Technologies. Bulletin of Ternopil National Technical University, (3), 18-23. doi:10.15830/btu.2015.03.028
Vatulia, G., Orel, Y., & Kovalov, M. (2014). Carrying capacity definition of steel-concrete beams with external reinforcement under the fire impact. Applied Mechanics and Materials, 617, 167-170.
Verma, S. K., Bhadauria, S. S., & Akhtar, S. (2014). Probabilistic evaluation of service life for reinforced concrete structures. Chinese Journal of Engineering, 2014, 1-8.
Xia, Y., & Chen, Z. (2023). Crack formation in reinforced concrete structures: A review. Construction and Building Materials, 310, 127099. doi:10.1016/j.conbuildmat.2022.127099
Zhang, J., & Li, Q. (2023). Crack formation in reinforced concrete structures: A case study. Journal of Construction Engineering and Management, 149(3), 04023027. doi:10.1061/(ASCE)CO.1943-7862.0002418
Zhang, W., & Wang, Y. (2023). A new repair method for cracks in reinforced concrete structures. Journal of Construction Engineering and Management, 149(3), 04023028. doi:10.1061/(ASCE)CO.1943-7862.0002419