IMPROVING FLEXURAL PROPERTIES OF ULTRA-HIGH PERFORMANCE FIBER REINFORCED CONCRETE BY USING A FLOW CONTROL METHOD

Author(s): H.H. Huang and X.J. Gao
Paper category: Proceedings
Book title: Proceedings of the 2nd International Conference on UHPC Materials and Structures (UHPC2018-China)
Editor(s): Caijun Shi and Baochun Chen
ISBN: 978-2-35158-219-0
e-ISBN: 978-2-35158-220-6
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 508-516
Total Pages: 9
Language : English

Abstract: This paper presented a novel method to improve flexural properties of ultra-high
performance fiber reinforced concrete (UHPFRC) by using one L-shape device with a narrow
horizontal channel to control flow of fresh mixture. Mixtures at water-to-binder ratios of 0.22
were prepared by adding 1%, 2% and 2.5% volume of steel fibers respectively. Three fiber
orientation parameters (including fiber orientation angle, fiber orientation number and fiber
orientation coefficient) were evaluated quantitatively using an image analysis technique.
Based on experimental results, this type of flow controlling method increased fiber orientation
number and fiber orientation coefficient from 0.6-0.7 and 0.4-0.6 to 0.7-0.9 and 0.6-0.8
respectively. The best enhancement on flexural strength, toughness, deflection at modulus of
rupture and maximum deflection reached 64.3%, 63.4%, 77.1% and 13.4% respectively.
Moreover, this method to control fiber orientation provides a great potential for reducing the
production cost of UHPFRC without degradation of flexural properties.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00