1. Impact of oxic and thermal transient phases on corrosion of carbon steel in different cementitious media : insights from new in situ experimentsC. Wittebroodt, Jules Goethals, Bojan Zajec, L. De Windt, Valéry Detilleux, 2026, izvirni znanstveni članek Povzetek: 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.
Ključne besede: bentonitic cement-based grout, deep geological disposal of nuclear waste, anoxic environment, electrical resistance corrosion sensors, groundwater, low-pH cement
Objavljeno v DiRROS: 27.01.2026; Ogledov: 155; Prenosov: 32
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2. Opening letter of RILEM TC CS : Calcium sulfoaluminate-based cement and concrete – critical review and open questionsEric Bescher, Sabina Dolenec, Daniel Jansen, Thomas Matschei, Cameron Murray, Julio Paniagua, Elsa Qoku, Antonio Telesca, Robert Thomas, Frank Winnefeld, 2025, drugi znanstveni članki Povzetek: Calcium sulfoaluminate (CSA)-based cements represent a promising alternative to traditional Portland cement, offering benefits such as rapid strength development, low shrinkage, and reduced carbon footprint. Despite their commercial availability and proven performance, the adoption of CSA cements remains hindered by gaps in standardization and understanding. This RILEM Technical Committee (TC) CSA aims to review current knowledge, identify research needs, and address challenges related to clinkering, hydration mechanisms, durability, applications, nomenclature, standardization, and testing of CSA-based cements. The outcomes will further the understanding of manufacturing, technical performance, use, and specification of CSA-based cements, ultimately leading to broader acceptance in concrete construction.
Ključne besede: calcium sulfoaluminate cement, ye'elimite, belite, ettringite, low-CO2 cement
Objavljeno v DiRROS: 14.01.2026; Ogledov: 178; Prenosov: 107
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