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Title |
Experimental Study on Enhancing the Fire Resistance of Fireproof Mortars for Concrete Structures
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Authors |
이진용(Jin-Yong Lee) ; 이정배(Jeong-Bae Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.6.737 |
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Keywords |
터널 화재; 내화재; 내화 모르타르; 화재 시나리오 tunnel fire; fire-protection material; fire-resistant mortar; fire scenario |
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Abstract |
In the event of a tunnel fire, it is essential to ensure sufficient evacuation time and secure escape routes to protect users from structural damage or collapse. This study evaluated the thermal performance of an improved fire-resistant mortar developed to enhance thermal insulation and fire resistance, thereby minimizing damage to concrete structures during fire exposure. Fire simulation tests were conducted based on the Rijkswaterstaat (RWS) and modified hydrocarbon (HCM) curves for fire scenarios, using mortars incorporating vermiculite as a lightweight aggregate and ground granulated blast furnace slag and fly ash as binders. The evaluation included measurements of mortar density and thermal conductivity, residual compressive strength after heating, phase changes analyzed by XRD, temperature variation in mortar-coated concrete under fire simulation, and visual assessment of post-heating surface conditions. The results showed that mortars with SG (Ground-Granulated Blast-Furnace Slag) effectively suppressed heat transfer and enhanced resistance to melting. In addition, vermiculite contributed to reducing temperature rise when used in appropriate proportions, which was closely associated with improved thermal insulation. These findings provide foundational data for material design and performance optimization of fire-resistant mortars and are expected to inform future design strategies for the practical application of fire-resistant concrete structures.
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