PSI - Issue 81

Bohdan Parneta et al. / Procedia Structural Integrity 81 (2026) 383–387

385

Moisture monitoring was carried out systematically, which made it possible to track the dynamics of water content in the specimens over the fourteen-year exposure period and to compare these data with the results obtained shortly after the installation of the waterproofing. This approach ensured a reliable assessment of the long-term performance of horizontal injection waterproofing and made it possible to evaluate the degree of influence of soluble salts on the internal structure of concrete. 3. Results The results of moisture content determination for the tested concrete specimens, as well as their comparison with the values recorded immediately after the installation of horizontal waterproofing (2010) and during the repeated testing after 14 years (2024), are presented in Table 1.

Table 1. Moisture content determination results. № specimen Standard

1 3

2 4

3 5

Standard 1 2

3 9

1

2

6

7

8

Experiment date W surface, % W internal, % Experiment date

22.10.2010

11.10.2024

2.75 2.25

1.90 2.40 2.20 2.65 1.80 1.70 1.50 2.20

1.80 2.25 2.10 1.75 1.60 1.40

29.10.2010

18.10.2024

W surface (wetted zone), % 2.85

4.10 4.00 4.20 2.75

4.00 4.19 4.00

W surface (dry zone), %

2.85

2.10 2.00 2.10 2.75

2.10 2.05 2.10

W internal (wetted zone), % 2.50

3.50 3.80 3.90 2.45

3.40 3.60 3.80

W internal (dry zone), %

2.50

1.90 2.10 2.10 2.50

1.90 2.10 2.10

Experiment date

05.11.2010

25.10.2024

W surface (wetted zone), % 2.85

4.40 4.40 4.60 2.75

4.25 4.20 4.55

W surface (dry zone), %

2.85

2.30 2.20 2.20 2.75

2.20 2.20 2.00

W internal (wetted zone), % 2.50

4.10 4.20 4.10 2.45

4.00 4.00 4.05

W internal (dry zone), %

2,50

2,10 2.20 2.30 2.50

2.00 2.10 2.10

Experiment date

12.11.2010

01.11.2024

W surface (wetted zone), % 2.85

4.70 4.50 4.70 2.75

4.70 4.50 4.70

W surface (dry zone), %

2.85

2.30 2.40 2.30 2.75

2.30 2.30 2.20

W internal (wetted zone), % 2.50

4.00 4.20 4.00 2.45

4.10 4.10 4.00

W internal (dry zone), %

2.50

2.20 2.30 2.20 2.50

2.20 2.20 2.20

The investigation of specimen moisture content showed that in the dry zones of the concrete specimens, moisture remained at a stable level comparable to that of the reference samples. At the same time, in the wetted zones, a slight increase in moisture was observed below the waterproofing layer, indicating gradual moisture accumulation in these areas. Above the level of horizontal waterproofing, no significant changes in moisture content were recorded, which confirms the stability of the protective effect of the injected layer. The analysis of the obtained data demonstrated that the highest intensity of moisture accumulation is preserved in thinner concrete specimens, whereas in specimens with greater thickness and of strength class C25/30, internal moisture remains significantly lower than surface moisture. This indicates the effective barrier action of horizontal injection waterproofing against capillary water rise. The data presented in Table 1 and Fig. 3 illustrate the dynamics of moisture changes in different layers of the concrete specimens over the fourteen-year exposure period. Comparison with the results of previous five-year observations makes it possible to identify patterns of long-term exposure to aggressive environments and to confirm the stability of the protective effect of horizontal injection waterproofing.