TY - JOUR A1 - Fürst, Richard A1 - Häßler, Dustin A1 - Stelzner, Ludwig A1 - Hothan, Sascha T1 - Fire resistance of existing steel structures with aged intumescent coating based on an in situ test method N2 - Intumescent coatings are commonly used in civil engineering to increase the fire resistance of steel structures. Exposed to fire, the intumescent coating reacts and forms a thermal protective char around the steel member. Thus, the heating of the steel is significantly slowed down and the fire resistance can be improved. Information regarding the scope of application and the durability of intumescent coatings are given in national approvals or European Technical Assessment documents. Due to the environmental conditions, intumescent coatings are subjected to ageing effects, which can reduce the durability and their thermal protection performance. To predict the durability for several years, during the approval procedure the behaviour of intumescent coatings is predominantly extrapolated based on accelerated artificial ageing. The established German and European assessment procedures to test and assess durability assume a working life of at least 10 years. Additional evidence may be required for longer periods. However, at present there is no method of verifying the thermal performance of existing structural members on site. For this reason, BAM is conducting the research project "INSIST" [1] to develop a minimally invasive in situ test method to determine the fire resistance of existing steel structures with applied intumescent coating. The investigation includes the development of a mobile prototype furnace. The paper describes the test setup, the developed prototype furnace, and the results of the performed test programme on uncoated and coated steel specimens. Based on this, recommendations for the test procedure are given. KW - In situ testing KW - Fire resistance KW - Intumescent coating KW - Steel KW - Thermal protection KW - Durability PY - 2025 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-629533 DO - https://doi.org/10.1016/j.firesaf.2025.104380 VL - 153 SP - 1 EP - 12 PB - Elsevier Ltd. AN - OPUS4-62953 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Fürst, Richard A1 - Häßler, Dustin A1 - Stelzner, Ludwig A1 - Hothan, Sascha T1 - Development of an in situ test method to assess the fire resistance of steel members with applied intumes-cent coating N2 - Intumescent coatings are commonly used in civil engineering to improve the fire resistance of steel constructions. Exposed to fire, the intumescent coating reacts and forms a thermal protective char around the steel member. Thus, the heating of the steel is delayed, and a higher fire resistance can be achieved. Generally, the scope of application and the durability of intumescent coatings are described in national approvals or European Technical Assessment (ETA) documents. Due to environmental conditions, intumescent coatings are subjected to ageing effects, which can reduce their durability and thermal protection performance. Available in situ methods to investigate the performance of applied intumescent coatings, such as visual inspection, flame exposure testing, adhesive tensile tests or chemical analysis, are not fully conclusive. Therefore, in the civil engineering practice, there is an increasing demand to verify the fire resistance of existing steel structures with applied intumescent coatings necessary in several cases, e.g., the working life is exceeded, the visual appearance of the intumescent coating changed or the information about the applied product is missing. The research presented in the paper shows the progress of the ongoing research project "INSIST" at BAM [1], where a new in situ method is being developed to assess the actual fire resistance of existing steel structures with applied intumescent coating. The investigation is based on a development of the in situ test procedure and a mobile prototype furnace. T2 - 10th Symposium Structural Fire Engineering CY - Braunschweig, Germany DA - 24.09.2024 KW - In situ KW - Intumescent coating KW - Steel structures KW - Test procedure PY - 2024 SP - 1 EP - 15 AN - OPUS4-61275 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Fürst, Richard A1 - Häßler, Dustin A1 - Stelzner, Ludwig A1 - Hothan, Sascha T1 - In situ test procedure to determine the fire resistance of exisiting steel structures with aged intumescent coating N2 - Intumescent coatings are commonly used in civil engineering to increase the fire resistance of steel structures. In case of a fire, the intumescent coating reacts and forms a thermally protective char around the steel member. Thus, the heating of the steel is significantly delayed, and as a result, a higher fire resistance can be achieved. Throughout the working life, intumescent coatings are aged by climatic factors. To predict durability for several years, the behaviour of the intumescent coatings is extrapolated based on accelerated artificial ageing. The established German and European assessment procedures to test and predict durability assume a working life of at least 10 years. For an extended period, additional evidence is required; yet the procedure and specifications to justify this are not described. Available in situ methods to assess the thermal performance of intumescent coatings are currently limited in their information content. Therefore, BAM is conducting a research project to develop a minimally invasive in situ test procedure to determine the fire resistance of existing steel structures with applied intumescent coating. The paper will describe the test setup, the developed prototype furnace, and the results of the performed test programme with uncoated and coated steel specimens. Based on this, recommendations for the test procedure are given. T2 - Structures in Fire 2024 CY - Coimbra, Portugal DA - 19.06.2024 KW - In situ KW - Intumescent coating KW - Steel structures KW - Test procedure PY - 2024 SN - 978-989-35292-2-5 DO - https://doi.org/10.30779/cmm_SIF24 SP - 1217 EP - 1228 AN - OPUS4-61258 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Fürst, Richard A1 - Häßler, Dustin A1 - Stelzner, Ludwig A1 - Hothan, Sascha T1 - Development of an in situ test method to assess the fire resistance of steel members with applied intumescent coating N2 - Intumescent coatings are commonly used in civil engineering to improve the fire resistance of steel constructions. Exposed to fire, the intumescent coating reacts and forms a thermal protective char around the steel member. Thus, the heating of the steel is delayed, and a higher fire resistance can be achieved. Generally, the scope of application and the durability of intumescent coatings are described in national approvals or European Technical Assessment (ETA) documents. Due to environmental conditions, intumescent coatings are subjected to ageing effects, which can reduce their durability and thermal protection performance. Available in situ methods to investigate the performance of applied intumescent coatings, such as visual inspection, flame exposure testing, adhesive tensile tests or chemical analysis, are not fully conclusive. Therefore, in the civil engineering practice, there is an increasing demand to verify the fire resistance of existing steel structures with applied intumescent coatings necessary in several cases, e.g., the working life is exceeded, the visual appearance of the intumescent coating changed or the information about the applied product is missing. The research presented in the paper shows the progress of the ongoing research project "INSIST" at BAM, where a new in situ method is being developed to assess the actual fire resistance of existing steel structures with applied intumescent coating. The investigation is based on a development of the in situ test procedure and a mobile prototype furnace. T2 - 10th Symposium Structural Fire Engineering – TU Braunschweig 2024 CY - Braunschweig, Germany DA - 24.09.2024 KW - In situ KW - Intumescent coating KW - Steel structures KW - Test procedure PY - 2024 AN - OPUS4-61261 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Fürst, Richard A1 - Häßler, Dustin A1 - Stelzner, Ludwig A1 - Hothan, Sascha T1 - In situ test procedure to determine the fire resistance of existing steel structures with aged intumescent coating N2 - BAM is conducting a research project to develop a minimally invasive in situ test procedure to determine the fire resistance of existing steel structures with applied intumescent coating. In presentation and submitted paper is describe the test setup, the developed prototype furnace, and the results of the performed test programme with uncoated and coated steel specimens. Based on this, recommendations for the test procedure are given. T2 - Structures in Fire 2024 CY - Coimbra, Portugal DA - 19.06.2024 KW - In situ KW - Intumescent coating KW - Steel structures KW - Test procedure PY - 2024 AN - OPUS4-61257 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hothan, Sascha A1 - Häßler, Dustin A1 - Stelzner, Ludwig A1 - Fürst, Richard A1 - Eiz Eddin, Ahmad T1 - Lösungsansätze für neue Herausforderungen im konstruktiven baulichen Brandschutz N2 - Der Klimawandel und die zunehmende Ressourcenknappheit stellen Herausforderungen dar, die in Zukunft grundlegende Anpassungen in der Art des Umgangs mit Rohstoffen, Energie und des Wirtschaftens an die Gesellschaft stellen werden. In der Leichtbaustrategie der Bundesregierung wird zusammenfassend festgestellt, dass der fortschreitende Klimawandel Technologien erfordert, die die Transformation der Wirtschaft, eine ressourcenschonende Wertschöpfung und eine nachhaltige und resiliente Rohstoffversorgung sicherstellen. Aus diesen für alle Wirtschaftszweige sehr allgemein formulierten Anforderungen und vor dem Hintergrund eines wachsenden Bedarfs schnell verfügbarer Bausubstanz, lassen sich konkrete Anforderungen für das Bauwesen ableiten. Es geht um die Reduktion des Ressourcenverbrauchs für die Errichtung und den Betrieb neuer Gebäude sowie die Nach- und Weiternutzung bestehender Bausubstanz. In der Bundesanstalt für Materialforschung und -prüfung (BAM) wurde im Themenfeld Infrastruktur das Aktivitätsfeld Leichtbau ins Leben gerufen, das die Forschungsaktivitäten zum Leichtbau bündelt. Im vorliegenden Beitrag werden ausgewählte Projekte in Bezug auf den konstruktiven baulichen Brandschutz vorgestellt und die besonderen Herausforderungen verdeutlicht sowie die daraus abgeleiteten technischen Lösungsmöglichkeiten aufgezeigt. Als Beispiel einer Bauweise mit höchstmöglicher Effizienz in der Materialausnutzung sowie exzellenter Recyclingfähigkeit des Werkstoffs wird im Abschnitt „Einsatz reaktiver Brandschutzsysteme auf Stahlzuggliedern mit Vollprofil“ gezeigt, wie der Feuerwiderstand von Stahlzuggliedern mit minimalem Materialaufwand sichergestellt werden kann. Anhand des Beispiels der „Alten Aktienspinnerei“ verdeutlicht sich die Relevanz der Methode für die Nachnutzung historischer Bausubstanz. Im Abschnitt „In situ Überprüfung des Feuerwiderstands von Stahltragwerken mit gealterten reaktiven Brandschutzsystemen“ wird gezeigt, wie in Zukunft die minimalinvasive Überprüfung der Wirksamkeit bereits über Jahrzehnte in Nutzung befindlicher reaktiver Brandschutzsysteme (RBS) ermöglicht wird. Dies bildet die Grundvoraussetzung für eine Weiternutzung sowie möglicherweise erforderliche Instandsetzung auch nach Überschreitung der ursprünglich vorgesehenen Nutzungsdauer des RBS anhand einer quantitativen Aussage zum noch vorhandenen Feuerwiderstand. Eine wichtige Strategie im Betonbau zur Verringerung des CO2-Ausstoßes wird im Abschnitt „Feuerwiderstand von Leichtbaukonstruktionen aus vorgespanntem Carbonbeton“ vorgestellt. Das Verbundforschungsvorhaben verfolgt die Entwicklung eines neuen Deckensystems aus vorgespanntem Carbonbeton. Die angestrebte Leichtbauweise verringert den Einsatz von Zement durch Minimierung des erforderlichen Betonvolumens. Um einen möglichst dünnen Deckenspiegel zu erzeugen ist eine Reduzierung der Betondeckung erforderlich, weshalb für den Brandfall Maßnahmen zu ergreifen sind, die die Erwärmung der Carbonbewehrung und die damit einhergehende Degradation des Materials begrenzen. In diesem Zusammenhang sind auch wirksame Strategien zur Eindämmung von Beton-abplatzungen zu entwickeln. Abschließend wird im Abschnitt „Gebäude in Stahl-Modulbauweise mit selbstaussteifenden Raumzellen“ herausgearbeitet, wie diese Bauweise zukünftig noch effizienter werden kann, indem eine Nachweismöglichkeit der aussteifenden Wände in Leichtbauweise für den Brandfall geschaffen wird. T2 - Bauphysikertreffen 2025 - Hochschule für Technik Stuttgart CY - Stuttgart, Germany DA - 28.11.2025 KW - Klimawandel KW - Ressourcenknappheit KW - Bausupstanz KW - Brandfall PY - 2025 VL - Bauphysikertagung 2025 SP - 1 EP - 12 AN - OPUS4-65371 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -