Effects of geometry and fraction of polypropylene fibers on permeability of ultra-high performance concrete after heat exposure

This paper investigated the effect of geometry and fraction of polypropylene (PP) fiber and the induced microcracks on permeability of ultra-high performance concrete (UHPC) subjected to elevated temperature. Residual permeability and microcrack networks of fifteen UHPC mixes were characterized and...

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Main Authors: Li, Ye, Zhang, Yao, Yang, En-Hua, Tan, Kang Hai
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/138975
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1389752020-05-14T07:50:22Z Effects of geometry and fraction of polypropylene fibers on permeability of ultra-high performance concrete after heat exposure Li, Ye Zhang, Yao Yang, En-Hua Tan, Kang Hai School of Civil and Environmental Engineering Engineering::Chemical technology Permeability Microstructure This paper investigated the effect of geometry and fraction of polypropylene (PP) fiber and the induced microcracks on permeability of ultra-high performance concrete (UHPC) subjected to elevated temperature. Residual permeability and microcrack networks of fifteen UHPC mixes were characterized and an analytical model correlating residual permeability of UHPC with fiber fraction and geometry was proposed. Results showed that increasing fiber length and dosage had much stronger effect than increasing fiber diameter on enhancing permeability due to greater enhancement on percolation of fiber tunnels. It was found that permeability of UHPC is positively correlated with both the aspect ratio and dosage of PP fibers. However, at low fiber aspect ratio, increased fiber dosage does not increase the permeability of UHPC. Similarly, at low fiber dosage, solely increasing fiber aspect ratio does not contribute much to increasing permeability of UHPC. The proposed model thus provides insight for PP fiber selection and optimization to prevent explosive spalling of concrete. NRF (Natl Research Foundation, S’pore) 2020-05-14T07:50:22Z 2020-05-14T07:50:22Z 2019 Journal Article Li, Y., Zhang, Y., Yang, E.-H., & Tan, K. H. (2019). Effects of geometry and fraction of polypropylene fibers on permeability of ultra-high performance concrete after heat exposure. Cement and Concrete Research, 116, 168-178. doi:10.1016/j.cemconres.2018.11.009 0008-8846 https://hdl.handle.net/10356/138975 10.1016/j.cemconres.2018.11.009 2-s2.0-85057303745 116 168 178 en Cement and Concrete Research © 2018 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Engineering::Chemical technology
Permeability
Microstructure
spellingShingle Engineering::Chemical technology
Permeability
Microstructure
Li, Ye
Zhang, Yao
Yang, En-Hua
Tan, Kang Hai
Effects of geometry and fraction of polypropylene fibers on permeability of ultra-high performance concrete after heat exposure
description This paper investigated the effect of geometry and fraction of polypropylene (PP) fiber and the induced microcracks on permeability of ultra-high performance concrete (UHPC) subjected to elevated temperature. Residual permeability and microcrack networks of fifteen UHPC mixes were characterized and an analytical model correlating residual permeability of UHPC with fiber fraction and geometry was proposed. Results showed that increasing fiber length and dosage had much stronger effect than increasing fiber diameter on enhancing permeability due to greater enhancement on percolation of fiber tunnels. It was found that permeability of UHPC is positively correlated with both the aspect ratio and dosage of PP fibers. However, at low fiber aspect ratio, increased fiber dosage does not increase the permeability of UHPC. Similarly, at low fiber dosage, solely increasing fiber aspect ratio does not contribute much to increasing permeability of UHPC. The proposed model thus provides insight for PP fiber selection and optimization to prevent explosive spalling of concrete.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Li, Ye
Zhang, Yao
Yang, En-Hua
Tan, Kang Hai
format Article
author Li, Ye
Zhang, Yao
Yang, En-Hua
Tan, Kang Hai
author_sort Li, Ye
title Effects of geometry and fraction of polypropylene fibers on permeability of ultra-high performance concrete after heat exposure
title_short Effects of geometry and fraction of polypropylene fibers on permeability of ultra-high performance concrete after heat exposure
title_full Effects of geometry and fraction of polypropylene fibers on permeability of ultra-high performance concrete after heat exposure
title_fullStr Effects of geometry and fraction of polypropylene fibers on permeability of ultra-high performance concrete after heat exposure
title_full_unstemmed Effects of geometry and fraction of polypropylene fibers on permeability of ultra-high performance concrete after heat exposure
title_sort effects of geometry and fraction of polypropylene fibers on permeability of ultra-high performance concrete after heat exposure
publishDate 2020
url https://hdl.handle.net/10356/138975
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