PSI - Issue 59

Vitalii Kovalchuk et al. / Procedia Structural Integrity 59 (2024) 360–366 Kovalchuk, Parneta & Rybak / Structural Integrity Procedia 00 (2023) 000 – 000

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restoration through injection, specifically utilizing a two-component solution. The tests were continued until the pipe reached complete destruction. To measure pipe deformations, digital sensors with a resolution of 0.01 mm were affixed to the inner surface of the pipe. Employing a pre-programmed microcontroller, strain results were systematically recorded and stored in a computer file at a frequency of 4 Hz. In conducting the studies, it was assumed that deformations occurred symmetrically. Therefore, measurements were performed solely on one side of the pipe. To achieve this, one sensor was positioned at the top of the concrete pipe, another on the side, and a third at the bottom of the pipe. 3. Results Continuous experimental measurements were conducted to assess the deformations of the reinforced pipe. As criteria for evaluating the effectiveness of pipe reinforcement using injection technology, two factors were considered: the first is the beginning of crack formation outside the pipe, and the second is the complete destruction of the pipe. The results detailing the deformed state of the pipe are presented in Table 1.

Table 1. Results of determining deformations of the restored concrete pipe

Pipe deformation measurement points 1 2 3 Deformations, mm

Data at the time:

Formation of cracks on the pipe

4.83 7.05

2.69 7.68

4.92 8.09

Pipe destruction

In Table 1, it is evident that the concrete pipe's maximum deformations, restored under static loads at the onset of crack formation, primarily occur in the vertical direction. Specifically, the vertical deformation values are 4.83 mm at the top of the pipe and 4.92 mm at the bottom. Upon complete destruction, the maximum vertical deformations of the pipe were recorded at 7.05 mm and 8.09 mm, respectively. On the horizontal side of the pipe, deformations are comparatively lower. During crack formation, horizontal deformations measure 2.69 mm, and at the time of pipe destruction, they increase to 7.68 mm. Figures 5 and 6 illustrate the distribution of deformations in the reinforced pipe at the time of crack formation and pipe destruction, respectively.

4,83

2,69

4,92

Fig. 5. A graphical representation of the distribution of deformations in the restored concrete pipe at the moment of crack formation outside the pipe.