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dc.contributor.authorZhang, Dongen_US
dc.contributor.authorZhang, Yaoen_US
dc.contributor.authorDasari, Aravinden_US
dc.contributor.authorTan, Kang Haien_US
dc.contributor.authorWeng, Yiweien_US
dc.identifier.citationZhang, D., Zhang, Y., Dasari, A., Tan, K. H. & Weng, Y. (2021). Effect of spatial distribution of polymer fibers on preventing spalling of UHPC at high temperatures. Cement and Concrete Research, 140, 106281-.
dc.description.abstractPolypropylene (PP) fibers are commonly used for the prevention of thermal spalling of ultra-high performance concrete (UHPC). In this work, the effect of fiber distribution on permeability and spalling resistance is investigated and an analytical model for permeability at 150 °C is proposed. This model, considering the parameters like fiber dimensions, dosage, and percolation, is based on Kozeny-Carman equation. It was found that the percolation of the interconnecting fiber network resulted in a significant increase in permeability of UHPC. X-ray tomography data on the three-dimensional spatial distribution of fibers reiterated that fiber aspect ratio and dosage (and fiber number density) were critical in increasing the fiber connectivity (percolation). It was also found that a vapor permeability of larger than 0.6 × 10⁻¹⁶ m² at 150 °C could eliminate spalling. Further, based on a semi-empirical approach, aspect ratio between 300 and 600 was recommended for spalling prevention with a fiber dosage of 0.3–0.4 vol%.en_US
dc.description.sponsorshipMinistry of National Development (MND)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofCement and Concrete Researchen_US
dc.rights© 2020 Elsevier Ltd. All rights reserved.en_US
dc.subjectEngineering::Civil engineeringen_US
dc.titleEffect of spatial distribution of polymer fibers on preventing spalling of UHPC at high temperaturesen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Civil and Environmental Engineeringen_US
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.subject.keywordsThermal Spallingen_US
dc.subject.keywordsUltra-high Performance Concreteen_US
dc.description.acknowledgementThis research work is supported by the Singapore Ministry of National Development and National Research Foundation under L2 NIC, Award No. L2NICCFP1-2013-4.en_US
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