Failure Modes in Concrete Repair Systems due to Ongoing Corrosion

Failure Modes in Concrete Repair Systems due to Ongoing Corrosion

Lukovic, M. (TU Delft Steel & Composite Structures)
Šavija, B. (TU Delft Materials and Environment)
Ye, G. (TU Delft Materials and Environment; Universiteit Gent)
Schlangen, E. (TU Delft Materials and Environment)
van Breugel, K. (TU Delft Materials and Environment)

2017

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, nonreinforcedmaterial (repair mortar), and commercial repairmortar 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.

http://resolver.tudelft.nl/uuid:013f4d5d-991d-40e6-971d-de078db25c36

https://doi.org/10.1155/2017/9649187

1687-8434

Advances in Materials Science and Engineering

Institutional Repository

journal article

© 2017 M. Lukovic, B. Šavija, G. Ye, E. Schlangen, K. van Breugel