PSI - Issue 81

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ScienceDirect

Procedia Structural Integrity 81 (2026) 383–387

© 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2025 organizers Keywords: moisture content; salinity; concrete; long-term studies; injection technology; operation. 1. Introduction The problem of moisture in concrete and reinforced concrete structures remains one of the key issues in ensuring their durability and operational reliability (Luchko et al., 2024; Sydor et al., 2024). Excessive moisture contributes to the gradual deterioration of materials, especially in foundation and basement parts of buildings where structures are in direct contact with moist soil (Kovalchuk et al., 2022; Marushchak et al., 2024). In the absence or failure of horizontal waterproofing, water penetrates through the external layers of concrete, damages plaster and concrete, and then migrates by capillary action within the material, reaching the inner layers of walls (Luchko et al., 2024; Rybak et al., 2025). Concrete and other building materials (brick, stone) have a porous structure with a network of capillaries and pores of various diameters (Luchko et al., 2019; Kovalchuk et al., 2024). Through capillaries, water can move against gravity and rise to a certain height depending on material properties. High-strength concrete (e.g., C25/30) allows less pressurized water to pass through but actively absorbs moisture by capillary action, whereas lower-grade concrete (C12/15) is more permeable to pressurized water, but Abstract The paper presents the results of experimental studies of the moisture content of concrete samples under the influence of NaCl (sodium chloride), conducted 14 years after the installation of horizontal injection waterproofing. The purpose is to evaluate the effectiveness of horizontal injection waterproofing of concrete structures during long-term operation. During the experiment, changes in moisture level were monitored in both the dry and wetted zones of the samples. The results show that after long-term exposure to an aggressive environment, the moisture level above the horizontal waterproofing remained stable and within the normal range of the reference samples. This confirms the effectiveness of the applied injection technology. The conducted experiment demonstrates that horizontal injection waterproofing is a reliable method for protecting concrete structures from moisture over the long term. VIII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2025) Assessment of the long-term effectiveness of horizontal injection waterproofing of concrete Bohdan Parneta a , Roman Rybak a, *, Svyatoslav Homon b , Taras Postranskyy a , Maksym Afonin a a Lviv Polytechnic National University, S. Bandery str. 12, Lviv, 79013, Ukraine b National University of Water and Environmental Engineering, Soborna str. 11, Rivne, 33028, Ukraine

* Corresponding author. Tel. +380-96-212-6776 E-mail address: roman.t.rybak@lpnu.ua

2452-3216 © 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2025 organizers 10.1016/j.prostr.2026.03.066