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|Title:||Effect of spatial distribution of polymer fibers on preventing spalling of UHPC at high temperatures||Authors:||Zhang, Dong
Tan, Kang Hai
|Issue Date:||2021||Source:||Zhang, 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-. https://dx.doi.org/10.1016/j.cemconres.2020.106281||Project:||L2NICCFP1-2013-4||Journal:||Cement and Concrete Research||Abstract:||Polypropylene (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%.||URI:||https://hdl.handle.net/10356/152258||ISSN:||0008-8846||DOI:||10.1016/j.cemconres.2020.106281||Rights:||© 2020 Elsevier Ltd. All rights reserved.||Fulltext Permission:||none||Fulltext Availability:||No Fulltext|
|Appears in Collections:||CEE Journal Articles|
Updated on Oct 18, 2021
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