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51318-11598-Epoxy coated galvanized rebars as an alternative for rebars used in concrete structures contaminated with chloride ions

Results of laboratory tests of dual-coated (zinc/epoxy) rebars embedded in concrete and in a concrete simulated pore solution with and without chloride contamination followed by a brief description of the adopted methodologies.

 

Product Number: 51318-11598-SG
Author: Mayara Stecanella Pacheco / Juliana Lopes Cardoso / Adriana de Araujo / Jose Luis Serra Ribeiro / Zehbour Panossian
Publication Date: 2018
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Corrosion of reinforced steel bars caused by chloride ions is one of the most important pathologies to be considered in durability of reinforced concrete structures built in environments of high aggressiveness, such as marine atmospheres. Applied methods to extend the service life of concrete structures are: use of adequate concrete specification and cover thickness; adoption of alternative materials to steel rebars; use of concrete protective coatings and cathodic protection techniques. In this context, dual-coated (zinc/epoxy) rebars have been widely used in various countries with very promising results. In Brazil, the use of coated rebars is incipient, summarized in some use of galvanized bars in special concrete structures without an additional epoxy layer. Therefore, it is important to introduce this alternative as a choice for the Brazilian market. This work aims to discuss the results of laboratory tests of dual-coated

(zinc/epoxy) rebars embedded in concrete and in a concrete simulated pore solution with and without chloride contamination followed by a brief description of the adopted methodologies. In this way, the use of dual-coated (zinc/epoxy) rebars can be disseminated in our country and a better understanding of its protection mechanism by the Brazilian community is expected.

Key words: zinc; epoxy; reinforcement; concrete; rebar; marine environment; marine structure; reinforcing bar; dual-coated

Corrosion of reinforced steel bars caused by chloride ions is one of the most important pathologies to be considered in durability of reinforced concrete structures built in environments of high aggressiveness, such as marine atmospheres. Applied methods to extend the service life of concrete structures are: use of adequate concrete specification and cover thickness; adoption of alternative materials to steel rebars; use of concrete protective coatings and cathodic protection techniques. In this context, dual-coated (zinc/epoxy) rebars have been widely used in various countries with very promising results. In Brazil, the use of coated rebars is incipient, summarized in some use of galvanized bars in special concrete structures without an additional epoxy layer. Therefore, it is important to introduce this alternative as a choice for the Brazilian market. This work aims to discuss the results of laboratory tests of dual-coated

(zinc/epoxy) rebars embedded in concrete and in a concrete simulated pore solution with and without chloride contamination followed by a brief description of the adopted methodologies. In this way, the use of dual-coated (zinc/epoxy) rebars can be disseminated in our country and a better understanding of its protection mechanism by the Brazilian community is expected.

Key words: zinc; epoxy; reinforcement; concrete; rebar; marine environment; marine structure; reinforcing bar; dual-coated

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