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
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,...
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MDPI AG
2020-08-01
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| Online Access: | https://www.mdpi.com/1996-1944/13/17/3792 |
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| author | Taegyu Lee Gyuyong Kim Gyeongcheol Choe Euichul Hwang Jaesung Lee Dongwoo Ryu Jeongsoo Nam |
| author_facet | Taegyu Lee Gyuyong Kim Gyeongcheol Choe Euichul Hwang Jaesung Lee Dongwoo Ryu Jeongsoo Nam |
| author_sort | Taegyu Lee |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T16:46:17Z |
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| id | doaj.art-de15d46b7fb044af8f29c5c3ea57806d |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T16:46:17Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-de15d46b7fb044af8f29c5c3ea57806d2023-11-20T11:39:35ZengMDPI AGMaterials1996-19442020-08-011317379210.3390/ma13173792Spalling Resistance of Fiber-Reinforced Ultra-High-Strength Concrete Subjected to the ISO-834 Standard Fire Curve: Effects of Thermal Strain and Water Vapor PressureTaegyu Lee0Gyuyong Kim1Gyeongcheol Choe2Euichul Hwang3Jaesung Lee4Dongwoo Ryu5Jeongsoo Nam6Department of Fire and Disaster Prevention, Semyung University, 65 Semyung-ro, Jecheon-si, Choongbuk 27136, KoreaDepartment of Architectural Engineering, Chungnam National University, Daejeon 34134, KoreaDepartment of Architectural Engineering, Chungnam National University, Daejeon 34134, KoreaDepartment of Architectural Engineering, Chungnam National University, Daejeon 34134, KoreaDepartment of Architectural Engineering, Hannam University, 70 Hannamro, Daeduk-Gu, Daejeon 306-791, KoreaDepartment of Architecture Engineering, Daejin University, Gyeonggi-do 11159, KoreaDepartment of Architectural Engineering, Chungnam National University, Daejeon 34134, KoreaThe 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.https://www.mdpi.com/1996-1944/13/17/3792ultra-high-strength concretethermal stresswater vapor pressureISO-834 standard fire curvepore formationfiber melting |
| spellingShingle | Taegyu Lee Gyuyong Kim Gyeongcheol Choe Euichul Hwang Jaesung Lee Dongwoo Ryu Jeongsoo Nam 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 Materials ultra-high-strength concrete thermal stress water vapor pressure ISO-834 standard fire curve pore formation fiber melting |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | ultra-high-strength concrete thermal stress water vapor pressure ISO-834 standard fire curve pore formation fiber melting |
| url | https://www.mdpi.com/1996-1944/13/17/3792 |
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