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Self-protection concrete measures as prevention measure from chloride transport and corrosion of reinforcement
Eduardo Torroja Institute of construction Science, Spain.
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.ORCID iD: 0000-0001-5760-4874
SINTEF, Norway.
Acciona Construction Technological Center, Spain.
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2023 (English)In: MATEC Web of Conferences, E-ISSN 2261-236X, Vol. 378Article in journal (Refereed) Published
Abstract [en]

Incorporation of additives into a reinforced concrete matrix to delay or even completely avoid the initiation of corrosion during the service-life of the construction is a widely pursued topic. One of the new promising technologies achieving increased interest is to incorporate corrosion inhibitors encapsulated in layered double hydroxide (LDH). LDH structures follow a controlled release of the inhibitor while chloride is efficiently trapped at the same time. Another type of nanostructure additive offering self-protection ability in concrete is polyhedral oligomeric silsesquioxanes (POSS) developed to exhibit water-repellent functionalities protecting the reinforcement from corrosive attack. In the present laboratory work, the enhanced performance of concrete infrastructures in a marine environment was studied using a SCC design. The addition of LDH (0.5, 1 and 2 % by mass of binder (bmb)) and POSS (2 and 4 % additive level) was explored. Migration and diffusion Cl transport tests have been performed towards corrosion protection of reinforcing bars. The results showed that Cl transport decreases with the concrete maturity, and this is even more effective for concretes with LDH and POSS. This delay effect is more pronounced in the unidirectional diffusional Cl transport. LDH is significantly retarding the initiation of rebar corrosion.

Place, publisher, year, edition, pages
2023. Vol. 378
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-66438DOI: 10.1051/matecconf/202337807003OAI: oai:DiVA.org:ri-66438DiVA, id: diva2:1794671
Conference
SMARTINCS’23 Conference on Self-Healing, Multifunctional and Advanced Repair Technologies in Cementitious Systems
Note

This work was supported by the HORIZON 2020 Collaborative Research and Innovation action “LORCENIS” (Long Lasting Reinforced Concrete for Energy Infrastructure under Severe Operating Conditions”, Grant agreement nº 685445) 2016-2020.

Available from: 2023-09-06 Created: 2023-09-06 Last updated: 2023-11-27Bibliographically approved

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Prieto Rábade, Miguel

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