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Investigation of Size Effects in Concrete Spalling

Untersuchung des Maßstabseffekts auf das Abplatzverhalten von Beton

  • Spalling of concrete due to fire exposure can lead to severe damage of building components. It is a much discussed subject in structural engineering and not yet completely understood. Generally, it is assumed that thermohydraulic and thermomechanical processes induce tensile stresses in the concrete. Furthermore, the tensile strength of concrete is reduced due to increasing temperatures. The combination of an increasing tensile stress and a decreasing tensile strength result in the occurrence of explosive spalling. The spalling behaviour of concrete is influenced by many parameters, for instance the water cement ratio, porosity, permeability of concrete as well, the presence of steel reinforcement and polypropylene fibres, also the size and geometry of the fire exposed area. Within the current research project at Bundesanstalt für Materialforschung und prüfung (BAM), the susceptibility to spalling of six different concrete mixtures is analysed to quantify the size effect using smallSpalling of concrete due to fire exposure can lead to severe damage of building components. It is a much discussed subject in structural engineering and not yet completely understood. Generally, it is assumed that thermohydraulic and thermomechanical processes induce tensile stresses in the concrete. Furthermore, the tensile strength of concrete is reduced due to increasing temperatures. The combination of an increasing tensile stress and a decreasing tensile strength result in the occurrence of explosive spalling. The spalling behaviour of concrete is influenced by many parameters, for instance the water cement ratio, porosity, permeability of concrete as well, the presence of steel reinforcement and polypropylene fibres, also the size and geometry of the fire exposed area. Within the current research project at Bundesanstalt für Materialforschung und prüfung (BAM), the susceptibility to spalling of six different concrete mixtures is analysed to quantify the size effect using small scale, intermediate scale and full scale tests. A special fire test setup was built to test specimens simultaneously to enable a better comparability. All specimens are tested without additional mechanical load and unrestraint to prevent external induced cracking at the fire exposed site. Thermocouples are used to measure in situ the temperature distribution as an indication on the thermal degradation of the concrete during the fire tests. Afterwards the maximum spalling depth and the damaged area of the specimen are illustrated by a photogrammetric measurement system. The contribution to the spalling workshop presents the results of four concrete mixtures tested in intermediate-scale and full-scale fire tests. The comparisons are based on the concrete temperature as well as the obtained photogrammetric data. The results show that the spalling depth and the spalling area are significantly affected by the size of the fire exposed area.zeige mehrzeige weniger

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  • 2019 Klimek Investigation of Size Effects.pdf
    eng
  • Fire-Spalling-Workshop_Proceedings.pdf
    eng

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Metadaten
Autor*innen:André Klimek, Sascha HothanORCiD, Andreas Rogge
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Graue Literatur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Proceedings of the 6th International Workshop on Concrete Spalling due to Fire Exposure
Jahr der Erstveröffentlichung:2019
Organisationseinheit der BAM:7 Bauwerkssicherheit
7 Bauwerkssicherheit / 7.3 Brandingenieurwesen
Verlag:The University of Sheffield
Verlagsort:Sheffield
Erste Seite:61
Letzte Seite:70
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau
Freie Schlagwörter:Concrete; Fire Test; Photogrammetry; Size Effect; Spalling
Themenfelder/Aktivitätsfelder der BAM:Infrastruktur
Infrastruktur / Fire Science
Veranstaltung:6th International Workshop on Concrete Spalling due to Fire Exposure
Veranstaltungsort:Sheffield, UK
Beginndatum der Veranstaltung:19.09.2019
Enddatum der Veranstaltung:20.09.2019
URL:https://firespallingworkshop2019.group.shef.ac.uk/wp-content/uploads/2019/09/Fire-Spalling-Workshop_Proceedings.pdf
ISBN:978-1-5272-4135-0
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:14.10.2019
Referierte Publikation:Nein
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