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Synergistic effects of hybrid polypropylene and steel fibers on explosive spalling prevention of ultra-high performance concrete at elevated temperature

Synergistic effects of hybrid polypropylene and steel fibers on explosive spalling prevention of ultra-high performance concrete at elevated temperature
Synergistic effects of hybrid polypropylene and steel fibers on explosive spalling prevention of ultra-high performance concrete at elevated temperature
This study investigated synergetic effects of hybrid polypropylene (PP) and steel fibers on explosive spalling prevention of ultra-high performance concrete (UHPC) at elevated temperature. Permeability of UHPC was measured and correlated to the extent of spalling quantitatively. Microstructures of UHPC before and after elevated temperature exposure were examined to reveal potential mechanisms responsible for changes in permeability. Results showed that the use of hybrid PP and steel fibers completely prevented explosive spalling even at low fiber dosage of both fibers due to significant increase of permeability. Microstructural analysis revealed that such synergistic effect on increased permeability of hybrid PP and steel fiber-reinforced UHPC was attributed to enhanced connectivity of empty PP fiber tunnels by multiple microcracks generated from the thermal expansion of both fibers.
Li, Ye
86d13351-982d-46c3-9347-22794f647f86
Tan, Kang Hai
d6b202e6-50ba-4236-961a-c9be0cb46e5c
Yang, En-Hua
a373a8d9-da6d-4c6c-b2c2-aa94073bbee7
Li, Ye
86d13351-982d-46c3-9347-22794f647f86
Tan, Kang Hai
d6b202e6-50ba-4236-961a-c9be0cb46e5c
Yang, En-Hua
a373a8d9-da6d-4c6c-b2c2-aa94073bbee7

Li, Ye, Tan, Kang Hai and Yang, En-Hua (2019) Synergistic effects of hybrid polypropylene and steel fibers on explosive spalling prevention of ultra-high performance concrete at elevated temperature. Cement and Concrete Composites, 96. (doi:10.1016/j.cemconcomp.2018.11.009).

Record type: Article

Abstract

This study investigated synergetic effects of hybrid polypropylene (PP) and steel fibers on explosive spalling prevention of ultra-high performance concrete (UHPC) at elevated temperature. Permeability of UHPC was measured and correlated to the extent of spalling quantitatively. Microstructures of UHPC before and after elevated temperature exposure were examined to reveal potential mechanisms responsible for changes in permeability. Results showed that the use of hybrid PP and steel fibers completely prevented explosive spalling even at low fiber dosage of both fibers due to significant increase of permeability. Microstructural analysis revealed that such synergistic effect on increased permeability of hybrid PP and steel fiber-reinforced UHPC was attributed to enhanced connectivity of empty PP fiber tunnels by multiple microcracks generated from the thermal expansion of both fibers.

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Accepted/In Press date: 15 November 2018
Published date: 7 December 2019

Identifiers

Local EPrints ID: 497289
URI: http://eprints.soton.ac.uk/id/eprint/497289
PURE UUID: 938df395-e384-4d9d-8b01-032c82eeda3c

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Date deposited: 17 Jan 2025 17:45
Last modified: 18 Jan 2025 03:23

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Contributors

Author: Ye Li ORCID iD
Author: Kang Hai Tan
Author: En-Hua Yang

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