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Tuesday, 20 August 2019
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Raw materials & technologies, Applications

Determining the thickness of passive fire protection for concrete tunnel segments

Monday, 3 August 2015

The Eurasia Tunnel is a part of the Bosporus Strait Highway Crossing Project connecting the Anatolian and European shores of Istanbul.

In the event of a tunnel fire, the increased concrete strength of the segments increases their likelihood of spalling. Source: Guru3D_shutterstock

In the event of a tunnel fire, the increased concrete strength of the segments increases their likelihood of spalling. Source: Guru3D_shutterstock

A paper evaluates the use of high strength concrete for the segments for the bored part of the tunnel under the effects of design fire conditions.

Results of fire exposure tests were discussed

High strength concrete enables the attainment of high early strength levels required for segment handling and increases the segment durability compared to segments designed by ordinary strength concrete. However, in the event of a tunnel fire, the increased concrete strength of the segments increases their likelihood of spalling compared to segments fabricated by ordinary strength concrete. Therefore, determination of the passive fire protection requirements must take into account the strength of the protected concrete. This paper will present and include a discussion of the results of small-scale fire exposure tests conducted to determine the required thickness of passive fire protection layer for the evaluated high strength concrete tunnel segments.

The study is publihed in: Construction and Building Materials, Volume 95, 1 October 2015, Pages 279-286.

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