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Lee, T., Kim, G., Choe, G., Hwang, E., Lee, J., Ryu, D., & Nam, J. (2020). 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, 13(17), 3792. | |||||
작성자 | 건설재료시공학연구실 | ||||
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조회수 | 125 | 등록일 | 2021.04.13 | ||
주저자 | Taegyu Lee | ||||
교신저자 | |||||
공동저자 | Gyuyong Kim,Gyeongcheol Choe,Euichul Hwang,Jaesung Lee,Dongwoo Ryu, Jeongsoo Nam | ||||
학술지명 | Materials | ||||
AbstractThe 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. |