TY - CONF A1 - Seifert, Lando T1 - New Stress Corrosion Cracking Test Method for Prestressing Steel Wires N2 - This presentation at CONSEC24 gives an overview of the new stress corrosion cracking test for prestressing steel wires using cathodic polarisation. Design of Experiments (DOE) studies on prestressing levels and cathodic current density on time to fracture will be presented, testing different prestressing steels. Finally, an experimental solution for testing strands is proposed. T2 - 10th International Conference on CONcrete under SEvere Conditions – Environment and Loading 2024 (CONSEC24) CY - Chennai, India DA - 25.09.2024 KW - Prestressing Steels KW - ISO 15630-3 KW - Hydrogen-induced Stress Corrosion Cracking KW - Brittle Fracture KW - Hydrogen Charging PY - 2024 AN - OPUS4-61166 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Seifert, Lando T1 - Influence of Prestress Level on Susceptibility to HiSCC of Prestressed Steels N2 - The BAM developed a new test method for assessing susceptibility to hydrogen-induced stress corrosion cracking (HiSCC) of prestressed steel, especially for wires. The setup contains polished specimens pre-stressed to a constant 80% Rm stress level. The specimens are constantly charged with hydrogen during the test by an electrochemically applied cathodic current density. The time to brittle fracture is measured. The new test method can provide a sensitive separation between different kinds of susceptible prestressed steel wires by fracture times. This enables further parameter studies with load level and cathodic current density variation. Therefore, known as high-susceptible quenched and tempered prestressing wires of “old-type” (without alloying Cr and manufactured before 1965), Hennigsdorfer and Neptun and currently approved cold-drawn wires were tested. A design of experiments (DOE) statistical model of time to fracture was calculated for the three wires. A significant susceptibility change appears in specific load level ranges, this is the contribution of this EUROCORR lecture. T2 - Conference EUROCORR 2024 CY - Paris, France DA - 01.09.2024 KW - Prestressing Steels KW - ISO 15630-3 KW - Hydrogen-induced Stress Corrosion Cracking KW - Brittle Fracture KW - Hydrogen Charging PY - 2024 AN - OPUS4-60988 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Seifert, Lando A1 - Müller, Thoralf A1 - Ebell, Gino T1 - The Influence of Hydrogen Loading and Prestressing on the Sensitivity of Prestressing Steel to Stress Corrosion Cracking N2 - This talk addresses the issue of hydrogen-induced stress corrosion cracking (HiSCC) in prestressing steels. The susceptibility to HiSCC is evaluated using free corrosion tests according to ISO 15630-3, which is problematic as it produces unreliable results. However, a new test method shows promising reproducible results and reveals that Cr-alloyed quenched and tempered (Q&T) steels are as sensitive to HiSCC as unalloyed Q&T steels. T2 - Conference EUROCORR 2025 CY - Stavanger, Norway DA - 07.09.2025 KW - Bridges KW - Stress Corrosion Cracking KW - Hydrogen-induced Stress Corrosion Cracking KW - Prestressing steels PY - 2025 AN - OPUS4-64087 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Seifert, Lando T1 - Promotionsvorhaben: Initiierung von Spannungsrisskorrosion in hochfesten Spannstählen N2 - This talk is a about the PhD-topic “initiation of hydrogen-induced stress corrosion cracking of prestressing steels (HiSCC)”, which is a major concern in civil engineering, particularly for prestressed concrete roofs and bridges. The susceptibility of prestressing steels to HiSCC is mainly influenced by manufacturing processes and the chemical composition, while the ability to hydrogen charging is by the environmental and surface conditions. To know about the real nature of susceptibility of the prestressing steel might be an important puzzle piece to contribute to safe prestressed concrete structures in the future. The material susceptibility of prestressing steels toward HiSCC is a topic which must be studied independently of the environmental conditions. This cumulative dissertation will focus on the most important aspects of material properties that play a role in the initiation point of HiSCC. T2 - Instituts-Symposium der TU München "Spannstahltage TUM" CY - Garching bei München, Germany DA - 14.11.2024 KW - Prestressing Steels KW - ISO 15630-3 KW - Hydrogen-induced Stress Corrosion Cracking KW - Brittle Fracture PY - 2024 AN - OPUS4-62052 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Seifert, Lando T1 - Committee Meeting to WIPANO "Safety of Prestressing Steels" N2 - A conclusion on the WIPANO research project "Safety of Prestressing Steel" was presented in the final committee meeting at the end of the project. The project's exciting findings and recommendations for a new method were discussed with the audience of national and international stakeholders of the prestressing steel industry and representatives of inspection bodies and standardization. T2 - Committee Meeting to WIPANO research Project CY - Online meeting DA - 29.09.2022 KW - ISO 15630-3 KW - Prestressing Steels KW - Hydrogen-induced Stress Corrosion Cracking KW - Hydrogen PY - 2022 AN - OPUS4-56101 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -