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Title |
Fire-resistive Covering Mortar to Prevent Performance Degradation of Concrete Exposed to High Temperatures
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Authors |
정현규(Hyun-Kyu Jeong) ; 이정배(Jeong-Bae Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.2.133 |
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Keywords |
화재노출 콘크리트; 내화 모르타르; RABT 화재 시나리오 fire-exposed concrete; fire-resistant mortar; RABT fire guidelines |
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Abstract |
This paper presents an experimental study focused on developing fire-resistant mortar to prevent the degradation of concrete structures exposed to fire, and evaluating its effectiveness in maintaining concrete performance. The study investigates the deterioration of the physical properties and durability of concrete when subjected to high temperatures. Tests were conducted by varying the exposure temperature and duration, measuring residual compressive strength, recording temperature history, andassessing durability. To confirm fire resistance, temperature changes were monitored after simulating a fire scenario, applying theRABT guidelines on the fitting and operation of road tunnels, as regulated by the German Federal Ministry of Transport and DigitalInfrastructure. The results revealed that higher exposure temperatures and longer exposure durations led to more significantdegradation of concrete performance, but that the application of fire-resistant mortar effectively blocked heat transfer into theconcrete, thereby preventing performance degradation. It was found that a fire-resistant mortar thickness of 20?30 mm or more issufficient to ensure the required fire resistance performance.
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