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Advances in Materials Science and Engineering
Volume 2017, Article ID 9649187, 14 pages
Research Article

Failure Modes in Concrete Repair Systems due to Ongoing Corrosion

1Delft University of Technology, Delft, Netherlands
2Magnel Laboratory for Concrete Research, Ghent University, Ghent, Belgium

Correspondence should be addressed to Mladena Luković; ln.tfledut@civokul.m

Received 21 September 2016; Accepted 26 February 2017; Published 2 April 2017

Academic Editor: Cristina Leonelli

Copyright © 2017 Mladena Luković et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Corrosion of steel reinforcement is the main cause of deterioration in reinforced concrete structures. It can result in cracking and spalling of the concrete cover. After the damaged cover is repaired, reinforcement corrosion might continue and even accelerate. While the development of the corrosion cell is difficult to control, the damage can be possibly delayed and controlled by use of a suitable repair material. The lattice fracture model is used in this paper to investigate the performance of strain hardening cementitious composite (SHCC) in concrete repair systems exposed to ongoing corrosion. Numerical results were verified by experimental tests when SHCC, nonreinforced material (repair mortar), and commercial repair mortar are used as repair materials. In experiments, reinforcement bars (surrounded by a repair material) were exposed to accelerated corrosion tests. The influence of the substrate surface preparation, the type of repair material, the interface, and the substrate strength on the resulting damage and failure mode of repair systems are discussed. In general, SHCC repair enables distributed cracking with small crack widths, up to several times smaller compared to repair mortar. Furthermore, more warning signs prior to the final failure are present in the SHCC repair system.