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http://dx.doi.org/10.9711/KTAJ.2021.23.5.359

Fire resistance assessment in construction joint of precast fireproof duct slab  

Choi, Soon-Wook (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology)
Kang, Tae-Ho (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology)
Lee, Chulho (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology)
Kim, Se Kwon (Research Institute, HONG G)
Kim, Tae Kyun (HONG G)
Chang, Soo-Ho (Construction Industry Promotion Department, Korea Institute of Civil Engineering and Building Technology)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.23, no.5, 2021 , pp. 359-370 More about this Journal
Abstract
Duct slabs, which are used to build ventilation facilities in underground spaces with transverse ventilation system, need to secure fire resistance according to longitudinal and heavy vehicle traffic of tunnels. This study measured the temperature change at the construction joint of the precast fireproof duct slab which integrates fire resistance material and duct slab under the RWS fire scenario. As a result, it was confirmed that if there is no reinforcement of the construction joint, damage will occur in concrete inside the construction joint, leading to damage to the fireproofing layer. On the other hand, when one side of the construction joint was reinforced with fireproofing materials, it showed more than three times the fire resistance performance compared to when there was no reinforcement. At this time, cross-sectional losses of concrete and fireproofing layer were shown in blocks without reinforcement, but no damage was seen in the reinforced blocks.
Keywords
Tunnel; Fire; Duct slab; Construction joint; Temperature;
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