Fire Resistance of Tunnel Liners with Steel and Polypropylene Fibers

Ma, Saidong; Quiel, Spencer; Naito, Clay; University Transportation Center for Underground Transportation Infrastructure; Colorado School of Mines

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ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners. As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.

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Fire Resistance of Tunnel Liners with Steel and Polypropylene Fibers

2023-12-01
By Ma, Saidong ; Quiel, Spencer ; Naito, Clay

English

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Details:

Creators:

Ma, Saidong ; Quiel, Spencer ; Naito, Clay

Ma, Saidong ; Quiel, Spencer ; Naito, Clay Less -
Corporate Creators:

University Transportation Center for Underground Transportation Infrastructure ; Colorado School of Mines

University Transportation Center for Underground Transportation Infrastructure ; Colorado School of Mines Less -
Corporate Contributors:

United States. Department of Transportation. University Transportation Centers (UTC) Program ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology

United States. Department of Transportation. University Transportation Centers (UTC) Program ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology Less -
Subject/TRT Terms:

[+]

Fiber Reinforced Concrete Fire Resistance Mix Design Polypropylene Spalling Steel Fibers Tunnel Lining
Publication/ Report Number:

LUY6T1
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Final Report (Oct. 2021 to Dec. 2023)
Corporate Publisher:

University Transportation Center for Underground Transportation Infrastructure (UTC)
Abstract:

This study aimed to assess the influence of polypropylene fibers on the fire resistance of steel fiber-reinforced concrete tunnel linings. Four distinct concrete mixtures were selected for comparison. The first mix contained only steel fibers and served as the control group. The subsequent three mixes incorporated varying amounts and lengths of polypropylene fibers based on the control mixture. For each mix, two concrete specimens of dimensions 150×457×610 mm were cast. All specimens were subjected to vertical loading at 20% of the design level of uniaxial compressive stress. The specimens were exposed to high temperatures using a gas radiant panel for single-sided heating. The results revealed that the concrete containing only steel fibers experienced complete spalling within 2.5 minutes. Conversely, the specimens with 1kg/m³ of 6mm polypropylene fibers displayed minimal spalling. The other two mixes with polypropylene fibers exhibited no thermally-induced spalling. These findings suggest that the inclusion of polypropylene fibers significantly enhances the fire resistance of concrete tunnel linings, offering a new perspective for tunnel safety. Additionally, temperature-time histories were recorded for a 25 mm thickness on the exterior of the heated concrete. These findings offer valuable insights for the design of fire-resistant concrete tunnel linings.
Format:

PDF
Funding:

69A3551747118
Collection(s):

University Transportation Centers
Main Document Checksum:

[+]

urn:sha-512:08c317b2d01a2f43087b5684d5fa3d5420c21ce77ac93cdb942f87f188137a3a42dd3c78346b305418acc9146dbb14ba0385a2b05cd362b6db0433175adc29af
Download URL:

https://rosap.ntl.bts.gov/view/dot/83645/dot_83645_DS1.pdf
File Type:

[PDF-3.22 MB]