Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/152124
Title: Effect of aggregate size and inclusion of polypropylene and steel fibers on explosive spalling and pore pressure in ultra-high-performance concrete (UHPC) at elevated temperature
Authors: Li, Ye
Pimienta, Pierre
Pinoteau, Nicolas
Tan, Kang Hai
Keywords: Engineering::Civil engineering
Issue Date: 2019
Source: Li, Y., Pimienta, P., Pinoteau, N. & Tan, K. H. (2019). Effect of aggregate size and inclusion of polypropylene and steel fibers on explosive spalling and pore pressure in ultra-high-performance concrete (UHPC) at elevated temperature. Cement and Concrete Composites, 99, 62-71. https://dx.doi.org/10.1016/j.cemconcomp.2019.02.016
Project: L2NICCFP1-2013-4
Journal: Cement and Concrete Composites
Abstract: This paper investigates the individual and combined effects of polypropylene (PP) fibers, steel fibers, and aggregate size on spalling behavior and pore pressure build-up of ultra-high-performance concrete (UHPC) exposed to elevated temperature. Simultaneous measurements of pore pressure and temperature were conducted at different depths in UHPC specimens under one-sided heating with a heating rate of 2 °C/min. Compressive, tensile, and permeability tests were performed to analyze spalling behavior. Addition of PP fibers fully prevented spalling and they are much more effective in increasing permeability than steel fibers and larger aggregates. The combined use of PP and steel fibers, and PP fibers and larger aggregates showed strong synergistic effect on increasing permeability. The higher the permeability, the lower was the maximum pore pressure measured in the samples. Two plateaus were observed from the temperature history due to vaporization of liquid water (between 115 and 125 °C inside the specimens) and release of water vapor (starting from 180 °C), respectively. The second plateau was identified as the functional temperature of PP fibers. Maximum pore pressures in spalled specimens were much lower than their tensile strengths, which could imply the contribution of hydraulic pressure in the region of moisture clog on spalling.
URI: https://hdl.handle.net/10356/152124
ISSN: 0958-9465
DOI: 10.1016/j.cemconcomp.2019.02.016
Rights: © 2019 Published by Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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