PSI - Issue 59

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

362

3

Fig. 1. The view of a destroyed (solid longitudinal cracks) concrete pipe before reinforcement.

Specifications of the test concrete pipe: outer diameter is 725 mm; inner diameter is 585 mm; wall thickness is 70 mm; height is 400 mm; Weight is 130 kg; concrete pipe class is C12/15. With the screeds, the pipe was folded in the form shown in Fig. 1. After that, the concrete pipe was repaired (restoration of integrity and load-bearing capacity) by injecting longitudinal cracks of the pipe with two-component epoxy resin. 2.2. Methods of concrete pipe repair with injection technologies VIMEPOX INJECT, a two-component epoxy injection resin, was used to bond the cracks in the concrete pipe. This mixture is capable of accepting compressive forces greater than 53 N / mm 2 it has good adhesion to concrete, more than 8 N / mm 2 . The concrete pipe repair method involved a series of preparatory and fundamental steps. Prior to commencing the repair process, the cracks in the concrete pipe were drained of water, and measures were taken to shield the pipe from moisture ingress. Along the cracks, the holes were made in 10...20 cm. Packers (fittings) for injection were mounted in the holes. The arrangement of packers along the four cracks is depicted in Fig. 2.

1

2

Diagram of longitudinal cracks in the pipe

1

60 20

100 150 150

100 90 130

4

2

‘

3

Location of a packer in the pipe crack body

3

4

70 200 130

60 200 140

Fig. 2. Diagram of installing packers along cracks in the pipe: 1, 2, 3, 4  longitudinal crack numbers in the pipe.