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<p>The traditional tunnel fire retardant coating has low strength and poor durability, which will cause damage and cracks due to the pre-disaster of tunnel fire and reduce the fire resistance. To overcome these defects, this study developed a heat-insulating and fire-resistant cementitious composite with excellent mechanical properties by using expanded perlite, silica aerogel, and basalt fiber, and named it PABC (perlite-aerogel-basalt-cement) mortar. The effect of PABC mortar on the temperature field of tunnel lining was tested by fire test, and its influence on the fire resistance of tunnel structure under the RABT heating curve was evaluated by finite element simulation. The results show that PABC mortar has good thermal insulation, and the temperature of the bottom steel bar is reduced from 474 to 148 ℃ in the fire test. PABC mortar can significantly improve the fire resistance of the tunnel structure and can reduce the bearing capacity reduction rate of the tunnel structure under the RABT fire heating curve from 47.8% to 11.5%. However, due to the size effect and heating conditions, PABC mortar exhibits different spalling behaviors in box-type resistance furnace tests and open flame tests, indicating that its spalling resistance requires further improvement.</p>

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Fire-Insulating Cementitious Composite for Tunnel Structures: Performance and Fire Tests

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • Zhangqian Ye,
  • Zhen Huang,
  • Guowang Meng,
  • Zhaojian Hu,
  • Yuke Luo

摘要

The traditional tunnel fire retardant coating has low strength and poor durability, which will cause damage and cracks due to the pre-disaster of tunnel fire and reduce the fire resistance. To overcome these defects, this study developed a heat-insulating and fire-resistant cementitious composite with excellent mechanical properties by using expanded perlite, silica aerogel, and basalt fiber, and named it PABC (perlite-aerogel-basalt-cement) mortar. The effect of PABC mortar on the temperature field of tunnel lining was tested by fire test, and its influence on the fire resistance of tunnel structure under the RABT heating curve was evaluated by finite element simulation. The results show that PABC mortar has good thermal insulation, and the temperature of the bottom steel bar is reduced from 474 to 148 ℃ in the fire test. PABC mortar can significantly improve the fire resistance of the tunnel structure and can reduce the bearing capacity reduction rate of the tunnel structure under the RABT fire heating curve from 47.8% to 11.5%. However, due to the size effect and heating conditions, PABC mortar exhibits different spalling behaviors in box-type resistance furnace tests and open flame tests, indicating that its spalling resistance requires further improvement.