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Title: Effect of spatial distribution of polymer fibers on preventing spalling of UHPC at high temperatures
Authors: Zhang, Dong
Zhang, Yao
Dasari, Aravind
Tan, Kang Hai
Weng, Yiwei
Keywords: Engineering::Civil engineering
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-.
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%.
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

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