Structural performance of repaired reinforced concrete beams with damaged compression zones: an experimental study using digital image correlation

Andrii Klym; Yaroslav Blikharskyy; Illia Lytvynenko; Jacek Selejdak; Dusan Katunsky; Volodymyr Gunka

doi:10.30657/pea.2026.32.22

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Structural performance of repaired reinforced concrete beams with damaged compression zones: an experimental study using digital image correlation

Production Engineering Archives

Volume 32 (2026): Issue 2 (June 2026)

By: Andrii Klym , Yaroslav Blikharskyy , Illia Lytvynenko , Jacek Selejdak , Dusan Katunsky and Volodymyr Gunka

Open Access

|May 2026

Abstract

This study investigates the repair effectiveness of reinforced concrete (RC) beams with crushed compression zones and reduced tensile reinforcement. The aim was to evaluate the restoration of load-bearing capacity and flexural performance after repair using polymer-modified mortar. The experimental program included four-point bending tests, high-precision displacement monitoring, and digital image correlation (DIC). Experimental results were compared with predictions obtained from a nonlinear sectional deformation model and with reference beams having reduced reinforcement but no damaged compression zone. The repaired beams reached a reinforcement yield moment of 8.62-8.97 kNm and an ultimate bending moment of 9.5 kNm. The strain in the repaired compression zone remained below the ultimate strain capacity of the repair mortar, indicating stable composite action between the original concrete and the repair material. The repair method increased the reinforcement yield moment by approximately 35%, confirming effective restoration of the compression zone and improved structural performance. The results demonstrate the usefulness of DIC for assessing repaired RC beams and support the application of polymer-modified repair systems for beams with damaged compression zones.

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Articles in this issue

DOI: https://doi.org/10.30657/pea.2026.32.22 | Journal eISSN: 2353-7779 | Journal ISSN: 2353-5156

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Language: English

Page range: 278 - 287

Submitted on: Feb 27, 2026

Accepted on: Apr 8, 2026

Published on: May 8, 2026

Published by: Quality and Production Managers Association

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

reinforced concrete beams,

digital image correlation,

structural repair,

load-bearing capacity,

flexural behavior

Related subjects:

Business and economics,

Business management,

Business management, other,

Engineering,

Mechanical engineering,

Production technology,

Process engineering and industrial engineering,

Materials sciences,

Materials sciences, other

© 2026 Andrii Klym, Yaroslav Blikharskyy, Illia Lytvynenko, Jacek Selejdak, Dusan Katunsky, Volodymyr Gunka, published by Quality and Production Managers Association
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 32 (2026): Issue 2 (June 2026)