Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/138975
Title: Effects of geometry and fraction of polypropylene fibers on permeability of ultra-high performance concrete after heat exposure
Authors: Li, Ye
Zhang, Yao
Yang, En-Hua
Tan, Kang Hai
Keywords: Engineering::Chemical technology
Issue Date: 2019
Source: 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
Journal: Cement and Concrete Research
Abstract: 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.
URI: https://hdl.handle.net/10356/138975
ISSN: 0008-8846
DOI: 10.1016/j.cemconres.2018.11.009
Rights: © 2018 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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