20.500.12556/DiRROS-25665 Impact of oxic and thermal transient phases on corrosion of carbon steel in different cementitious media insights from new in situ experiments The impact of oxic and thermal transient phases on corrosion of carbon steel in cementitious environment was studied through three in situ experiments (Tournemire URL, France). For two years, heated metallic samples (80 °C) were placed in direct or indirect contact with two different cementitious materials: a low-pH Bentonitic Cement Grout (BCG) and a Portland cement paste material (CEM I). Mineralogical and microstructural analyses were carried out in an attempt to identify the combined effects of pH, chemistry and microstructure properties associated with such specific cementitious media on steel corrosion mechanisms. Additionally, in situ Electrical Resistance (ER) corrosion sensors allowed to continuously monitor the corrosion rates corresponding to each of the three field experiments. Post-mortem characterisation indicated that metallic samples embedded in low-pH BCG were heavily damaged and exhibited high corrosion rate. Conversely, steel samples in contact with highly alkaline CEM I environment appeared to be much less impacted by corrosion processes and revealed extremely low corrosion rate values. A comparison between these field experiments observations and results previously obtained through complementary laboratory mock-up tests finally enabled the evaluation of the impact that variations in geometrical/design aspect existing between in situ and laboratory tests can induce on material degradation. bentonitic cement-based grout deep geological disposal of nuclear waste anoxic environment electrical resistance corrosion sensors groundwater low-pH cement bentonitno-cementna zmes globinsko odlaganje jedrskih odpadkov anoksično okolje električni uporovni senzorji podtalnica cementne zmesi z nizko ph vrednostjo true false true Geological Society Angleški jezik Slovenski jezik © 2025 The Author(s) Neznano 2026-01-27 08:03:27 2026-01-27 08:21:34 2026-01-28 04:15:00 0000-00-00 00:00:00 2026 0 0 str. 1-42 Vol. 561 2026 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 2026-01-12 2027-01-12 544.5/.6 2041-4927 10.1144/gslspecpub2025-49 263283715 https://doi.org/10.1144/gslspecpub2025-49 0 494869c2-fb4e-11f0-a15d-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=38943 RAZ_Wittebroodt_C._2026.pdf RAZ_Wittebroodt_C._2026.pdf 1 89052C795C5CCB503202F1FCF3900E1B b9c125cac3573ba988115dbec4690788937042e8b935c7333e5cdf8b1aaff5d6 c92f4680-fb50-11f0-a15d-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=38946 Zavod za gradbeništvo Slovenije 0 0 0