PSI - Issue 59

Vitalii Kovalchuk et al. / Procedia Structural Integrity 59 (2024) 360–366 Kovalchuk, Parneta & Rybak / Structural Integrity Procedia 00 (2019) 000 – 000

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Reinforced concrete culverts exhibit high strength and a prolonged service life. However, even in such robust structures, various defects and damages may manifest over an extended period of service (Burchenya et. al., 2023). Additionally, according to (Kovalchuk et al., 2021; Marushchak et al., 2023), constant adverse environmental influences and vehicle loads contribute to damages, resulting in a reduction in load-bearing capacity, particularly the development of cracks in the concrete of pipes. The majority of pipes in active use are constructed from concrete (Machelski, 2016). The extended operation of concrete and reinforced concrete pipes inevitably leads to a decline in performance over time ( Bęben , 2013). Furthermore, as outlined in the study by (Vybranets et al., 2023), the technical condition of structures is influenced by operational shortcomings, technological errors in their manufacturing process, and various other factors. Also, studies (Fayyad and Lees, 2017; Soltani et al., 2013), the relationship between the width of crack opening and the load level has been established. This underscores the need for the development of methods for both partial and complete restoration of operational pipe structures. Repairing damaged concrete structures, as outlined in the DSTU (2016), can be achieved through injection or impregnation technologies utilizing various types of repair solutions. This approach to sealing cracks gained widespread adoption in the 1980s, emerging as a pivotal and extensively utilized method. The injection technology, considering numerous physical and mechanical parameters of materials and associated technical considerations, is inherently complex. Furthermore, regarding the object's durability and the necessity for future repairs, this undertaking is highly responsible (Czarneki and Emmons, 2002). The injection technology for structural restoration finds extensive application in European countries, where it is standardized (EN 1504, 2009). This standard encompasses various stages of structural repair, including diagnosing the causes of damage, determining the most effective repair method, establishing requirements for the technical characteristics of materials and test methods, as well as monitoring and evaluating the quality of the performed work. Additionally, standard outlines the requirements for injection and impregnation technologies for reinforced concrete structures and the materials suitable for these purposes. In the studies (Kovalchuk et al., 2022b; Rybak et al., 2022), findings related to the analysis of the stress-strain state of reinforced concrete pipes subjected to ambient temperature variations are presented. It is observed that a temperature stress disparity exists at the interface of the metal cage, serving as reinforcement, and the pre-existing pipe, suggesting that reinforcing with metal clips may not always be an effective solution. However, upon scrutinizing existing research, it becomes apparent that there is currently a lack of results pertaining to the deformed state of reinforced concrete pipes, especially those whose integrity and load-bearing capacity have been restored using injection technologies. The objective of this study is to develop a methodology for assessing the deformed state of a concrete pipe whose integrity and load-bearing capacity have been restored through the application of injectable two-component epoxy material. This will facilitate the acquisition of meaningful data regarding the effectiveness of repairing defective reinforced concrete pipes using injectable polymer materials. 2. Methods of experimental research 2.1. Parameters of the restored concrete pipe To investigate the effectiveness of employing injection technologies for restoring the load-bearing capacity of damaged reinforced concrete pipes, a fully compromised concrete pipe was utilized. As illustrated in Fig. 1, the pipe comprises four distinct elements, with longitudinal cracks traversing the entire plane of the pipe section. It is noteworthy that this particular pipe had suffered complete destruction, as evidenced by the studies presented by the authors in the work (Kovalchuk et al., 2022).