Combined effect of flax fibers and steel fibers on spalling resistance of ultra-high performance concrete at high temperature
This paper investigated the combined effects of flax fibers and steel fibers on spalling behavior, residual permeability, and compressive strength of ultra-high performance concrete (UHPC) after exposure to elevated temperature. Thermal analysis and microstructure observation were conducted to study...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/160666 |
| _version_ | 1811696095507513344 |
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| author | Zhang, Dong Tan, Guan Yu Tan, Kang Hai |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Zhang, Dong Tan, Guan Yu Tan, Kang Hai |
| author_sort | Zhang, Dong |
| collection | NTU |
| description | This paper investigated the combined effects of flax fibers and steel fibers on spalling behavior, residual permeability, and compressive strength of ultra-high performance concrete (UHPC) after exposure to elevated temperature. Thermal analysis and microstructure observation were conducted to study the mechanism of the hybrid fibers in spalling prevention. The findings showed that the combined use of steel and flax fibers could completely prevent spalling of UHPC with relatively low fiber content, while solely using either steel fibers or flax fibers did not prevent spalling even with high fiber contents. The synergistic effect of hybrid flax and steel fibers on enhancing spalling resistance of UHPC was attributed to the increase in permeability from flax fibers and the bridging effect of steel fibers under elevated temperature. The mechanism of enhanced permeability of UHPC relied on two aspects: shrinkage of flax fibers at high temperature created interfacial gaps between the flax fibers and the matrix and microcracks created by the expansion of steel fibers enhanced the connectivity of these gaps and the microcracks. The bonding between steel fibers and matrix retained at a certain level at temperatures below 400 °C, which could also help mitigate spalling. It was also found that the combination of steel and flax fibers could compromise the reduction in compressive strength caused by the addition of flax fibers. |
| first_indexed | 2024-10-01T07:33:55Z |
| format | Journal Article |
| id | ntu-10356/160666 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:33:55Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1606662022-07-29T06:41:52Z Combined effect of flax fibers and steel fibers on spalling resistance of ultra-high performance concrete at high temperature Zhang, Dong Tan, Guan Yu Tan, Kang Hai School of Civil and Environmental Engineering Engineering::Civil engineering Natural Fiber Spalling This paper investigated the combined effects of flax fibers and steel fibers on spalling behavior, residual permeability, and compressive strength of ultra-high performance concrete (UHPC) after exposure to elevated temperature. Thermal analysis and microstructure observation were conducted to study the mechanism of the hybrid fibers in spalling prevention. The findings showed that the combined use of steel and flax fibers could completely prevent spalling of UHPC with relatively low fiber content, while solely using either steel fibers or flax fibers did not prevent spalling even with high fiber contents. The synergistic effect of hybrid flax and steel fibers on enhancing spalling resistance of UHPC was attributed to the increase in permeability from flax fibers and the bridging effect of steel fibers under elevated temperature. The mechanism of enhanced permeability of UHPC relied on two aspects: shrinkage of flax fibers at high temperature created interfacial gaps between the flax fibers and the matrix and microcracks created by the expansion of steel fibers enhanced the connectivity of these gaps and the microcracks. The bonding between steel fibers and matrix retained at a certain level at temperatures below 400 °C, which could also help mitigate spalling. It was also found that the combination of steel and flax fibers could compromise the reduction in compressive strength caused by the addition of flax fibers. Ministry of National Development (MND) National Research Foundation (NRF) This research/work is supported by the Singapore Ministry of National Development and National Research Foundation under L2 NIC, Award No. L2NICCFP1-2013-4. 2022-07-29T06:41:52Z 2022-07-29T06:41:52Z 2021 Journal Article Zhang, D., Tan, G. Y. & Tan, K. H. (2021). Combined effect of flax fibers and steel fibers on spalling resistance of ultra-high performance concrete at high temperature. Cement and Concrete Composites, 121, 104067-. https://dx.doi.org/10.1016/j.cemconcomp.2021.104067 0958-9465 https://hdl.handle.net/10356/160666 10.1016/j.cemconcomp.2021.104067 2-s2.0-85105434648 121 104067 en L2NICCFP1-2013-4 Cement and Concrete Composites © 2021 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Natural Fiber Spalling Zhang, Dong Tan, Guan Yu Tan, Kang Hai Combined effect of flax fibers and steel fibers on spalling resistance of ultra-high performance concrete at high temperature |
| title | Combined effect of flax fibers and steel fibers on spalling resistance of ultra-high performance concrete at high temperature |
| title_full | Combined effect of flax fibers and steel fibers on spalling resistance of ultra-high performance concrete at high temperature |
| title_fullStr | Combined effect of flax fibers and steel fibers on spalling resistance of ultra-high performance concrete at high temperature |
| title_full_unstemmed | Combined effect of flax fibers and steel fibers on spalling resistance of ultra-high performance concrete at high temperature |
| title_short | Combined effect of flax fibers and steel fibers on spalling resistance of ultra-high performance concrete at high temperature |
| title_sort | combined effect of flax fibers and steel fibers on spalling resistance of ultra high performance concrete at high temperature |
| topic | Engineering::Civil engineering Natural Fiber Spalling |
| url | https://hdl.handle.net/10356/160666 |
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