Journal article
Influence of steel fiber content on the rate-dependent flexural performance of ultra-high performance concrete with coarse aggregates
Steel fiber is widely used to improve the flexural performance of ultra-high performance concrete (UHPC), yet the synergistic effect of steel fiber and coarse aggregates in UHPC containing coarse aggregates (UHPC-CA) has not been elucidated. Here, the influence of fiber content on the rate-dependent flexural performance of UHPC-CA is investigated from the view of the synergistic effect of steel fiber and coarse aggregates.
Results reveal that the increasing pull-out force due to the increase of the crack mouth opening speed at a higher loading rate is responsible for the flexural curve type transition of UHPC-CA. The first crack stress is insensitive to the fiber content. However, the dynamic increase factors (DIFs) of the flexural strength and energy absorption capability of UHPC-CA decrease with increasing fiber content, which is attributed to a lower crack propagation speed of UHPC-CA with a higher fiber content.
A model concerning the crack propagation speed and the critical angle for the fracture of coarse aggregates is proposed.
Language: | English |
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Year: | 2022 |
Pages: | 125935 |
ISSN: | 18790526 and 09500618 |
Types: | Journal article |
DOI: | 10.1016/j.conbuildmat.2021.125935 |
ORCIDs: | Mejlhede Jensen, Ole |