Mechanism of PVA fibers in mitigating explosive spalling of engineered cementitious composite at elevated temperature
Polyvinyl alcohol (PVA) fibers have been found effective in preventing explosive spalling of engineered cementitious composite (ECC) under fire loading. However, the fundamental mechanism of minimizing the spalling risk by adding PVA fibers remains unclear. Thus, this paper addresses the mode of act...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2020
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| Online Access: | https://hdl.handle.net/10356/139834 |
| _version_ | 1824455113884827648 |
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| author | Liu, Jin-Cheng Tan, Kang Hai |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Liu, Jin-Cheng Tan, Kang Hai |
| author_sort | Liu, Jin-Cheng |
| collection | NTU |
| description | Polyvinyl alcohol (PVA) fibers have been found effective in preventing explosive spalling of engineered cementitious composite (ECC) under fire loading. However, the fundamental mechanism of minimizing the spalling risk by adding PVA fibers remains unclear. Thus, this paper addresses the mode of action of PVA fibers in combating explosive spalling of ECC at high temperature. In this regard, hot permeability of ECC and mortar was measured. PVA fibers were found to increase hot permeability of ECC significantly before their melting. Microstructure and EDX analysis were conducted to achieve a better understanding of how PVA fibers actually function to increase hot permeability before melting. The enlarged empty zones around the PVA fibers were the reason for the significant increase in permeability. Residue from melted PVA fibers was observed on the channel walls and did not diffuse into the matrix. For the first time laser distance meter was used to record progressive spalling history in heated samples. An in-depth discussion on the relationship between temperature, pore pressure, and spalling was also provided. |
| first_indexed | 2025-02-19T03:33:03Z |
| format | Journal Article |
| id | ntu-10356/139834 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:33:03Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1398342020-05-28T06:30:13Z Mechanism of PVA fibers in mitigating explosive spalling of engineered cementitious composite at elevated temperature Liu, Jin-Cheng Tan, Kang Hai School of Civil and Environmental Engineering Engineering::Civil engineering ECC High Temperature Polyvinyl alcohol (PVA) fibers have been found effective in preventing explosive spalling of engineered cementitious composite (ECC) under fire loading. However, the fundamental mechanism of minimizing the spalling risk by adding PVA fibers remains unclear. Thus, this paper addresses the mode of action of PVA fibers in combating explosive spalling of ECC at high temperature. In this regard, hot permeability of ECC and mortar was measured. PVA fibers were found to increase hot permeability of ECC significantly before their melting. Microstructure and EDX analysis were conducted to achieve a better understanding of how PVA fibers actually function to increase hot permeability before melting. The enlarged empty zones around the PVA fibers were the reason for the significant increase in permeability. Residue from melted PVA fibers was observed on the channel walls and did not diffuse into the matrix. For the first time laser distance meter was used to record progressive spalling history in heated samples. An in-depth discussion on the relationship between temperature, pore pressure, and spalling was also provided. 2020-05-22T03:39:00Z 2020-05-22T03:39:00Z 2018 Journal Article Liu, J.-C., & Tan, K. H. (2018). Mechanism of PVA fibers in mitigating explosive spalling of engineered cementitious composite at elevated temperature. Cement and Concrete Composites, 93, 235-245. doi:10.1016/j.cemconcomp.2018.07.015 0958-9465 https://hdl.handle.net/10356/139834 10.1016/j.cemconcomp.2018.07.015 2-s2.0-85050871033 93 235 245 en Cement and Concrete Composites © 2018 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Civil engineering ECC High Temperature Liu, Jin-Cheng Tan, Kang Hai Mechanism of PVA fibers in mitigating explosive spalling of engineered cementitious composite at elevated temperature |
| title | Mechanism of PVA fibers in mitigating explosive spalling of engineered cementitious composite at elevated temperature |
| title_full | Mechanism of PVA fibers in mitigating explosive spalling of engineered cementitious composite at elevated temperature |
| title_fullStr | Mechanism of PVA fibers in mitigating explosive spalling of engineered cementitious composite at elevated temperature |
| title_full_unstemmed | Mechanism of PVA fibers in mitigating explosive spalling of engineered cementitious composite at elevated temperature |
| title_short | Mechanism of PVA fibers in mitigating explosive spalling of engineered cementitious composite at elevated temperature |
| title_sort | mechanism of pva fibers in mitigating explosive spalling of engineered cementitious composite at elevated temperature |
| topic | Engineering::Civil engineering ECC High Temperature |
| url | https://hdl.handle.net/10356/139834 |
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