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The mode of action of polypropylene fibres in high performance concrete at high temperatures

  • It has been shown in fire tests that polypropylene fibres reduce or avoid explosive spalling of high performance concrete. In the critical temperature ränge up to 300 °C the permeability of HPC increases by using polypropylene fibre. Due to this the water vapour, which is the main reason for explosive spalling, can escape. There exist different theories in the literature conceming the micro structural mechanisms, which cause an increase in the permeability. Within the framework of an internal research project at BAM an innovative methodology was developed for experimental verifying of existing theories and to get new insights into this problem The methodology used is unique and has been undertaken here for the first time. This consists of the combination of acoustic emission and ultrasonic measurement during temperature loading and the non-destructive micro structural analysis of cooled down samples with the aid of micro X-ray computed tomography. For the validation of theIt has been shown in fire tests that polypropylene fibres reduce or avoid explosive spalling of high performance concrete. In the critical temperature ränge up to 300 °C the permeability of HPC increases by using polypropylene fibre. Due to this the water vapour, which is the main reason for explosive spalling, can escape. There exist different theories in the literature conceming the micro structural mechanisms, which cause an increase in the permeability. Within the framework of an internal research project at BAM an innovative methodology was developed for experimental verifying of existing theories and to get new insights into this problem The methodology used is unique and has been undertaken here for the first time. This consists of the combination of acoustic emission and ultrasonic measurement during temperature loading and the non-destructive micro structural analysis of cooled down samples with the aid of micro X-ray computed tomography. For the validation of the nondestructive test methods scanning electron microscopic images of prepared samples were undertaken. The results show that due to the thermal decomposition of the polypropylene fibres micro canals emerge. These are connected due to a simultaneous micro cack formation.zeige mehrzeige weniger

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Metadaten
Autor*innen:Klaus Pistol, Frank WeiseORCiD, Birgit MengORCiD, U. Schneider
Persönliche Herausgeber*innen:E.A.B. Koenders, F. Dehn
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):2nd International RILEM workshop on concrete spalling due to fire exposure (Proceedings)
Jahr der Erstveröffentlichung:2011
Verlag:RILEM Publications
Erste Seite:289
Letzte Seite:296
Freie Schlagwörter:Acoustic emission; High performance concrete; Polypropylene fibres; Scanning electron microscopy; Spalling; X-ray computed tomography
Veranstaltung:2nd International RILEM workshop on concrete spalling due to fire exposure
Veranstaltungsort:Delft, The Netherlands
Beginndatum der Veranstaltung:05.10.2011
Enddatum der Veranstaltung:07.10.2011
ISBN:978-2-35158-118-6
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:19.02.2016
Referierte Publikation:Nein
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