Influence of fibre content and aggregate size on the behaviour of ultra-high performance fibre-reinforced concrete during fire

Author(s) : M. Schneider, J. Kolsek, A. Sajna
Paper category : Proceedings
Book title : UHPFRC 2017 Designing and Building with UHPFRC: New large-scale implementations, recent technical advances, experience and standards
Editor(s) : F. Toutlemonde & J. ResplendinoT.Ch.
Print-ISBN : 978-2-35158-166-7
e-ISBN : 978-2-35158-167-4
Publisher : RILEM Publications SARL
Publication year : 2017
Pages: 63 - 72
Total Pages : 10
Language : English

Abstract: The behaviour of ultra-high performance fibre-reinforced concrete (UHPFRC) during fire exposure needs special focus in an analysis of load bearing capacity of structures. On one hand the temperature-induced decrease of compressive strength and Young’s Modulus of such concrete seems to be different compared to ordinary concrete due to hard stone aggregates which are predominantly responsible for the mechanical properties during fire. On the other hand the spalling effect increases in UHPFRC because the cement matrix is denser than the cement matrix of ordinary concrete. The research activities presented in this paper aimed at evaluation of 5 different UHPFRC mixes from which 5 meso-scale plate specimens were prepared and tested at standard fire conditions. Only one tested specimen survived the test with only few surface cracks. The rest collapsed completely into a depth up to 10 cm. The results implied that only adding PP-fibres to an UHPFRC mix is not enough to improve its fire resistance up to a level comparable to ordinary and high performance concrete.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00