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Author(s):


Medium: journal article
Language(s): German
Published in: Beton- und Stahlbetonbau, , n. 7, v. 107
Page(s): 476-483
DOI: 10.1002/best.201200024
Abstract:

Polypropylene fibres in high performance concretes. Mechanisms of action in the event of fire

Structural members and bearing structures of high performance concrete generally have to be protected against explosive spalling due to fire exposure to guarantee a sufficient fire resistance. Up to now, the economically and technologically most worthwhile method to prevent explosive spalling is the addition of polypropylene fibres. Though the effectiveness of the fibres could be shown empirically, the mechanisms preventing explosive spalling are still debatable. The present article summarizes the existing theories concerning the mode of action of polypropylene fibres in fire exposed high performance concretes and presents an innovative methodology for analysing the micro structural processes. The results show that due to the thermal decomposition of the polypropylene fibres micro channels are created and simultaneously connected due to a netlike micro crack formation. This enables the relief of internal stresses (mechanical effect) and the formation of a permeable transport system for the escaping water vapour (permeation effect).

Keywords:
acoustic emission acoustic emission (AE) fire safety ultra high-performance concrete (UHPC) structural fire protection high performance concrete HPC computed tomography micro cracks polypropylene fibres scanning electron microscopy test method acoustic emission monitoring measuring technology UHPC
Available from: Refer to publisher
Structurae cannot make the full text of this publication available at this time. The full text can be accessed through the publisher via the DOI: 10.1002/best.201200024.
  • About this
    data sheet
  • Reference-ID
    10066869
  • Published on:
    05/09/2012
  • Last updated on:
    13/08/2014
 
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