STUDY ON THE EFFECTS OF DEFORMED STEEL FIBRES ON STRENGTHENING AND TOUGHENING OF ULTRA-HIGH PERFORMANCE CONCRETE

Author(s): Gai-Fei Peng, Xu-Jing Niu, Yi-Lin Zhao, Yi-Gang Li
Paper category: Proceedings
Book title: proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Service Life of Cement-Based Materials and Structures
Editor(s): Miguel Azenha, Ivan Gabrijel, Dirk Schlicke, Terje Kanstad and Ole Mejlhede Jensen
ISBN:978-2-35158-170-4
e-ISBN: 978-2-35158-173-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 352-361
Total Pages:10
Language : English

Abstract: In order to investigate the effects of deformed steel fibres on strengthening and toughening of
the characteristics of ultra-high performance concrete (UHPC), direct tensile loading and
bending tests have been conducted on UHPC with different steel fibre geometries, dosages
and distributions. Moreover, the pull-out channels and pull-out sections of fibres were
observed by means of microscope. The results indicate that deformed steel fibres are very
helpful to improve the tensile strength and fracture energy of UHPC. The higher the dosage of
steel fibres, the better the effects of strengthening and toughening. Notably, the steel fibres
orientated along the direction of tensile stress provide a better performance than the
randomly-distributed steel fibres, with respect to tensile strength, post-cracking ductility and
fracture energy of UHPC. Furthermore, compared with hooked steel fibres, the influence of
crimped steel fibres on strengthening and toughening of UHPC are more efficient and the
pull-out channels are more zigzag. Moreover, adding crimped steel fibres with higher strength
is a promising approach to prepare a novel UHPC which will have high toughness, high
durability and a long service life.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00