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Preparation and application of super-high pumping steel fiber reinforced concrete

Author(s): S. Wei, J. Jinyang, Z. Yunsheng
Paper category: Workshop
Book title: Fifth International RILEM Workshop on High Performance Fiber Reinforced Cement Composites (HPFRCC5)
Editor(s): H.W. Reinhardt, A.E. Naaman
ISBN: 978-2-35158-046-2
Pages: 283 - 291
Total Pages: 9
Language: English

In this paper, a type of small-size fibers with dumbbells on two ends and notches in the middle are first designed to improve the workability of fresh steel fiber reinforced concrete (SFRC). By using the small-size fiber with specially designed appearance, the SFRC is successfully pumped to 306 meter high Sutong bridge tower once. The results demonstrate that the small-sized steel fiber not only can obviously restrain various shrinkages but also can greatly improve the axial tension strength, the toughness index and the bond strength between rebar and concrete, resulting in high resistance to non-loaded crack. The results also show the crack resistance of concrete beam is increased by approximately 40% due to an addition of small-sized steel fiber. Finally a full-scale model test is conducted to compare the cracking resistance between plain concrete and small-sized steel fiber reinforced concrete. It is found that the maximum crack width, cracking length and run-through crack number in the bridge anchorage zone made with SFRC are much less than those of plain concrete, which further indicates the small-sized steel fiber specially designed in this paper can effectively improve the structural crack resistance.

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

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