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Spalling Resistance of Fiber-Reinforced Ultra-High-Strength Concrete Subjected to the ISO-834 Standard Fire Curve: Effects of Thermal Strain and Water Vapor Pressure.

Authors
  • Lee, Taegyu1
  • Kim, Gyuyong2
  • Choe, Gyeongcheol2
  • Hwang, Euichul2
  • Lee, Jaesung3
  • Ryu, Dongwoo4
  • Nam, Jeongsoo2
  • 1 Department of Fire and Disaster Prevention, Semyung University, 65 Semyung-ro, Jecheon-si, Choongbuk 27136, Korea. , (North Korea)
  • 2 Department of Architectural Engineering, Chungnam National University, Daejeon 34134, Korea. , (North Korea)
  • 3 Department of Architectural Engineering, Hannam University, 70 Hannamro, Daeduk-Gu, Daejeon 306-791, Korea. , (North Korea)
  • 4 Department of Architecture Engineering, Daejin University, Gyeonggi-do 11159, Korea. , (North Korea)
Type
Published Article
Journal
Materials
Publisher
MDPI AG
Publication Date
Aug 27, 2020
Volume
13
Issue
17
Identifiers
DOI: 10.3390/ma13173792
PMID: 32867379
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The prevention and mitigation of spalling in high-strength concrete (HSC) rely on mixing polypropylene (PP) as an additive reinforcement. The dense internal structures of ultra-high-strength concrete (UHSC) result in risks associated with a high thermal stress and high water vapor pressure. Herein, the effects of pore formation and thermal strain on spalling are examined by subjecting fiber-laden UHSC to conditions similar to those under which the ISO-834 standard fire curve was obtained. Evaluation of the initial melting properties of the fibers based on thermogravimetric analysis (TGA) and differential thermal analysis (DTA) demon strated that although nylon fibers exhibit a higher melting point than polypropylene and polyethylene fibers, weight loss occurs below 200 °C. Nylon fibers were effective at reducing spalling in UHSC compared to polypropylene and polyethylene fibers as they rapidly melt, leading to pore formation. We anticipate that these results will serve as references for future studies on the prevention of spalling in fiber-reinforced UHSC.

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