Corrosion behaviour of innovative stainless steels in mortar |
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Authors: | MC García-Alonso JA González ML Escudero M Salta |
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Affiliation: | a Department of Materials Engineering, Degradation and Durability, CENIM-CSIC Avda. Gregorio del Amo, 8. 28040 Madrid, Spain b Materials Department, LNEC. Avenida do Brasil, 101, 1700-066 Lisbon, Portugal c Cogne Acciai Speciali S.p.A., Via Paravera, 16. 11100, Aosta, Italy |
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Abstract: | The main problem of the building sector is the limited durability of reinforcing concrete structures under highly aggressive environments due to the corrosion of reinforcements. In order to demonstrate that stainless steels are the adequate solution to avoid corrosion of reinforced concrete structures by contained chlorides, the corrosion behaviour of AISI 304 and AISI 316L stainless steels in mortar with two chloride doses is compared with the corrosion behaviour of three new stainless steels of low Ni content and reduced cost, and with the traditional carbon steel. The lowest chloride contamination (2% Cl−) has been used in this research to provoke corrosion in an active state of reinforcing carbon steel, whereas the highest one (5% Cl−) exceeds all expected levels found in the natural environment, including sea water. The new stainless steels remain in the passive state in mortar specimens with both chloride contents. |
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Keywords: | Corrosion C Electrochemical properties C Chloride D Mortar E Reinforced stainless steels |
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