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Passive corrosion of steel reinforcement in blended cement-based material in the context of nuclear waste disposal

Abstract : An experimental campaign was carried out to study the passivity of steel embedded in blended cement paste. Mockup samples made of steel coupons (milled or pre-corroded) embedded in cement paste were tested under controlled relative humidity or in a solution simulating clay underground water and under aerated and de-aerated conditions, during up to 3 years. The results of gravimetric measurements show that the average corrosion rates determined on milled coupons are lower than 1 µm/year and vary from 0.2 to 2.7 µm/year for pre-corroded coupons. An apparent passive corrosion state is reached rapidly whatever the environmental conditions. Moreover, solid characterisations (Raman spectroscopy and SEM-EDS) point to a stable state in terms of the nature of the corrosion products and of the composition of the steel/cement paste interface. These results are similar to the ones previously obtained for steel coupons embedded in Portland cement mortar. This paper is part of a supplement on the 6th International Workshop on Long-Term Prediction of Corrosion Damage in Nuclear Waste Systems.
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https://hal-cea.archives-ouvertes.fr/cea-02380909
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Submitted on : Tuesday, November 26, 2019 - 2:19:46 PM
Last modification on : Thursday, June 25, 2020 - 2:54:34 PM

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Laure Chomat, Etienne Amblard, Jérôme Varlet, Cécile Blanc, Xavier Bourbon. Passive corrosion of steel reinforcement in blended cement-based material in the context of nuclear waste disposal. Corrosion Engineering, Science and Technology, Maney Publishing, 2017, 52 (sup1), pp.148-154. ⟨10.1080/1478422X.2017.1300378⟩. ⟨cea-02380909⟩

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