Influence of the nature of the synthetic incorporated fibres in UHPFRC when subjected to fire conditions

Author(s): E. Ouedraogo, Y. Malecot, L. Missemer, C. Clergue, D. Rogat
Paper category: Symposium
Book title: RILEM-fib-AFGC International Symposium on Ultra-High Performance Fibre-Reinforced Concrete
Editor(s): F. Toutlemonde, J. Resplendino
Print ISBN: 978-2-35158-130-8
e-ISBN: 978-2-35158-131-5
Publisher: RILEM Publications S.A.R.L
Pages: 303– 314
Total Pages: 12
Language: English

Abstract: 
The study focuses on the knowledge on the fire behaviour of an Ultra High Performance Concrete in formulations without or with polypropylene or acrylic fibres of different dosages. Blowtorch tests showed that formulations with acrylic fibres exhibited spalling for important dosages unlike formulations with polypropylene fibres which exhibited spalling for dosages significantly lower. Analyses of the SEM micrographs showed that the network of microcracks around the beds of polypropylene fibres was denser than around acrylic ones and, on the other hand, polypropylene when spraying left completely the fibre beds unlike acrylic ones. Through analysis of mercury porosimetry measurements, one could highlight a criterion called critical zone factor that allows the discrimination of the fire resistant formulations from the others.

Online publication: 2014
Publication Type: full_text
Public price (Euros): 0.00