Research on the Effects of Deformed Steel Fibers on Strengthening and Toughening of Ultra-High Performance Concrete

Author(s): Gui-Fei Peng, Xu-Jing Niu, Yi-Lin Zhao, Shuang-Xi Zhou
Paper category: Proceedings
Book title: 1st International Conference on UHPC Materials and Structures
Editor(s): Caijun Shi and Dehui Wang
ISBN: 978-2-35158-164-3
e-ISBN: 978-2-35158-165-O
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 295-303
Total Pages: 09
Language: English

Abstract: In order to investigate the effects of deformed steel fibers 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 fiber geometries, dosages and distributions. Moreover, the pull-out channels and pull-out sections of fibers were observed by means of a microscope. The results indicate that deformed steel fibers are very helpful to improve the tensile strength and fracture energy of UHPC. The higher the dosage of steel fibers, the better the effects of strengthening and toughening. Notably, the steel fibers orientated along the direction of tensile stress provide better performance than the randomly-distributed steel fibers, with respect to tensile strength, post-cracking ductility and fracture energy of UHPC.
Furthermore, compared with hooked steel fibers, the influence of crimped steel fibers on strengthening and toughening of UHPC are more efficient and the pull-out channels are more zigzag. Moreover, adding crimped steel fibers 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