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Fire spalling of self-compacting concrete mixtures with different limestone powder contents

  • Self-compacting concrete typically contains a higher content of powder materials than normal concrete. Furthermore it is assumed that the use of superplasticizers yields a more homogenous microstructure in the hardened paste. Both aspects generate a very dense microstructure, which can be assumed to cause material behaviour that differs from than normal concrete when it is exposed to elevated temperatures. However, the paste volumes in SCC can vary significantly based on the mixture composition. At a low paste volumes SCC can be very similar to normal concrete at hardened state while it can vary greatly at higher paste volumes. Since the high temperature behaviour of concrete is strongly affected by the different physical behaviour of the paste and the aggregates, it is likely that the high temperature behaviour is consequently strongly affected by the ratio of these mixture components. In the present study different SCC mixtures were observed with similar mechanical properties, butSelf-compacting concrete typically contains a higher content of powder materials than normal concrete. Furthermore it is assumed that the use of superplasticizers yields a more homogenous microstructure in the hardened paste. Both aspects generate a very dense microstructure, which can be assumed to cause material behaviour that differs from than normal concrete when it is exposed to elevated temperatures. However, the paste volumes in SCC can vary significantly based on the mixture composition. At a low paste volumes SCC can be very similar to normal concrete at hardened state while it can vary greatly at higher paste volumes. Since the high temperature behaviour of concrete is strongly affected by the different physical behaviour of the paste and the aggregates, it is likely that the high temperature behaviour is consequently strongly affected by the ratio of these mixture components. In the present study different SCC mixtures were observed with similar mechanical properties, but with significantly differing paste to aggregate ratios. Based on observations of the heat evolution at the fire exposed surface and at different depths inside the specimens as well as based on photogrammetric observations of the spalled dimensions, the results indicate that with increasing paste volumes the heat conductivity is reduced and as a result concrete with higher paste to aggregate ratios shows less spalling.zeige mehrzeige weniger

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Metadaten
Autor*innen:Steve Werner, Wolfram SchmidtORCiD, Stephan PirskawetzORCiD, Andreas Rogge
Persönliche Herausgeber*innen:Kamal Henry Khayat
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Proceedings of the 8th RILEM Symposium on Self-Compacting Concrete
Jahr der Erstveröffentlichung:2016
Herausgeber (Institution):RILEM
Verlag:RILEM Publications S.A.R.L.
Verlagsort:Paris, France
Erste Seite:353
Letzte Seite:363
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Fire exposure; High temperature behaviour; Mixture composition; Photogrammetry; Spalling
Veranstaltung:8th RILEM Symposium on Self-Compacting Concrete
Veranstaltungsort:Washington, USA
Beginndatum der Veranstaltung:15.05.2016
Enddatum der Veranstaltung:18.05.2016
ISBN:978-2-35158-157-5
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:18.07.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:10.11.2016
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