Chloride Diffusion in Concrete Protected with a Silane-Based Corrosion Inhibitor
1
Department of Engineering and Applied Sciences, University of Bergamo, 24044 Dalmine (BG), Italy
2
UdR Materials and Corrosion, Consorzio INSTM, 50121 Florence, Italy
3
UdR Bergamo, Consorzio CSGI, 50019 Sesto Fiorentino, Italy
*
Author to whom correspondence should be addressed.
Materials 2020, 13(8), 2001; https://doi.org/10.3390/ma13082001
Received: 25 March 2020
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Revised: 23 April 2020
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Accepted: 23 April 2020
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Published: 24 April 2020
(This article belongs to the Special Issue Corrosion in Concrete: Inhibitors and Coatings)
One of the most important parameters concerning durability is undoubtedly represented by cement matrix resistance to chloride diffusion in environments where reinforced concrete structures are exposed to the corrosion risk induced by marine environment or de-icing salts. This paper deals with protection from chloride ingress by a silane-based surface-applied corrosion inhibitor. Results indicated that the corrosion inhibitor (CI) allows to reduce the penetration of chloride significantly compared to untreated specimens, independently of w/c, cement type, and dosage. Reduction of chloride diffusion coefficient (Dnssn) measured by an accelerated test in treated concrete was in the range 30–60%. Natural chloride diffusion test values indicate a sharp decrease in apparent diffusion coefficient (Dapp) equal to about 75% when concrete is protected by CI. Mechanism of action of CI in slowing down the chloride penetration inside the cement matrix is basically due to the water repellent effect as confirmed by data of concrete bulk electrical resistivity.
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Keywords:
durability of concrete; chloride penetration; rebar corrosion; corrosion inhibitor; silane-based surface treatment
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MDPI and ACS Style
Coppola, L.; Coffetti, D.; Crotti, E.; Gazzaniga, G.; Pastore, T. Chloride Diffusion in Concrete Protected with a Silane-Based Corrosion Inhibitor. Materials 2020, 13, 2001. https://doi.org/10.3390/ma13082001
AMA Style
Coppola L, Coffetti D, Crotti E, Gazzaniga G, Pastore T. Chloride Diffusion in Concrete Protected with a Silane-Based Corrosion Inhibitor. Materials. 2020; 13(8):2001. https://doi.org/10.3390/ma13082001
Chicago/Turabian StyleCoppola, Luigi, Denny Coffetti, Elena Crotti, Gabriele Gazzaniga, and Tommaso Pastore. 2020. "Chloride Diffusion in Concrete Protected with a Silane-Based Corrosion Inhibitor" Materials 13, no. 8: 2001. https://doi.org/10.3390/ma13082001
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