On the mechanism of prevention of explosive spalling in ultra-high performance concrete with polymer fibers
It has been a common practice to use polymer fibers to reduce susceptibility of explosive spalling in ultra-high performance concrete (UHPC). However, to-date, despite the proposition of different mechanisms through which polymer fibers enhance gas permeability and reduce explosive spalling, there a...
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sg-ntu-dr.10356-1439542020-10-05T02:38:36Z On the mechanism of prevention of explosive spalling in ultra-high performance concrete with polymer fibers Zhang, Dong Dasari, Aravind Tan, Kang Hai School of Civil and Environmental Engineering School of Materials Science and Engineering Engineering::Civil engineering Spalling Ultra-high Performance Concrete It has been a common practice to use polymer fibers to reduce susceptibility of explosive spalling in ultra-high performance concrete (UHPC). However, to-date, despite the proposition of different mechanisms through which polymer fibers enhance gas permeability and reduce explosive spalling, there are many unanswered questions and unjustified claims on the proposed mechanisms. Therefore, the major emphasis of this work is to thoroughly re-examine and understand the exact role of polymer fibers in the prevention of explosive spalling of UHPC. A range of analytical and microscopic tools are used to realize this objective. It is concluded that melting of polymer fibers and creation of empty channels are not required for enhancing the permeability of gases or water vapor through concrete. In fact, it is the thermal mismatch between embedded fibers and matrix that is critical in obtaining an interconnected network of cracks in the matrix. This occurs even before melting of polypropylene (PP) fibers. The network of cracks is responsible for enhancing permeability, thereby reducing the susceptibility of explosive spalling of UHPC. 2020-10-05T02:38:36Z 2020-10-05T02:38:36Z 2018 Journal Article Zhang, D., Dasari, A., & Tan, K. H. (2018). On the mechanism of prevention of explosive spalling in ultra-high performance concrete with polymer fibers. Cement and Concrete Research, 113, 169-177. doi: 10.1016/j.cemconres.2018.08.012 0008-8846 https://hdl.handle.net/10356/143954 10.1016/j.cemconres.2018.08.012 113 169 177 en Cement and Concrete Research © 2018 Elsevier Ltd. All rights reserved. |
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Engineering::Civil engineering Spalling Ultra-high Performance Concrete Zhang, Dong Dasari, Aravind Tan, Kang Hai On the mechanism of prevention of explosive spalling in ultra-high performance concrete with polymer fibers |
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It has been a common practice to use polymer fibers to reduce susceptibility of explosive spalling in ultra-high performance concrete (UHPC). However, to-date, despite the proposition of different mechanisms through which polymer fibers enhance gas permeability and reduce explosive spalling, there are many unanswered questions and unjustified claims on the proposed mechanisms. Therefore, the major emphasis of this work is to thoroughly re-examine and understand the exact role of polymer fibers in the prevention of explosive spalling of UHPC. A range of analytical and microscopic tools are used to realize this objective. It is concluded that melting of polymer fibers and creation of empty channels are not required for enhancing the permeability of gases or water vapor through concrete. In fact, it is the thermal mismatch between embedded fibers and matrix that is critical in obtaining an interconnected network of cracks in the matrix. This occurs even before melting of polypropylene (PP) fibers. The network of cracks is responsible for enhancing permeability, thereby reducing the susceptibility of explosive spalling of UHPC. |
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School of Civil and Environmental Engineering |
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School of Civil and Environmental Engineering Zhang, Dong Dasari, Aravind Tan, Kang Hai |
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Article |
author |
Zhang, Dong Dasari, Aravind Tan, Kang Hai |
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Zhang, Dong |
title |
On the mechanism of prevention of explosive spalling in ultra-high performance concrete with polymer fibers |
title_short |
On the mechanism of prevention of explosive spalling in ultra-high performance concrete with polymer fibers |
title_full |
On the mechanism of prevention of explosive spalling in ultra-high performance concrete with polymer fibers |
title_fullStr |
On the mechanism of prevention of explosive spalling in ultra-high performance concrete with polymer fibers |
title_full_unstemmed |
On the mechanism of prevention of explosive spalling in ultra-high performance concrete with polymer fibers |
title_sort |
on the mechanism of prevention of explosive spalling in ultra-high performance concrete with polymer fibers |
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2020 |
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https://hdl.handle.net/10356/143954 |
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