Experimental study on reinforced concrete segment using fireproof concrete for shield tunnel in highway or railway

Title: Experimental study on reinforced concrete segment using fireproof concrete for shield tunnel in highway or railway
Author(s): T. Arai and K. Furuichi
Paper category : conference
Book title: 2nd International RILEM Workshop on Concrete Spalling due to Fire Exposure
Editor(s): E.A.B. Koenders and F. Dehn
ISBN: 978-2-35158-118-6
e-ISBN: 978-2-35158-119-3
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 255 - 262
Total Pages: 8
Nb references: 4
Language: English

Abstract: A fire in the current shield tunnel on highway or railway would cause explosive spalling of concrete lining due to high temperature that mostly results in significant damages to the tunnel structure. The conventional fire protections for the tunnel structure have utilized separate ceramic panels being attached or spraying fireproof materials on the surface of the lining. However, the ceramic panels are rather costly, and the spraying induces poor working conditions. As a substitute, the reinforced concrete segment with enhanced fireproof performance has been developed by the use of short organic fiber preventing exfoliation.
First, in order to examine the mixture ratio of short fiber, fire test using small specimens was performed based on RABT-curve. As a result, it was confirmed appropriate mixture ratio to prevent the explosive spalling. Next, fire test in the full-scale specimens using the fiber and bending test after the fire test were conducted, and the fireproof performance and the residual loading capacity on actual reinforced concrete segment was verified. Furthermore, the thermal conductivity analysis was conducted and compared with the experimental result. It is found that the thermal hysteresis shows good agreement. This paper mainly reports on the results of fire test.

Online publication: 2012-01-17
Publication type : full_text
Public price (Euros): 0.00