An experimental evaluation to determine the required thickness of passive fire protection layer for high strength concrete tunnel segments

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

[1]  Christian La Borderie,et al.  Experimental analysis of concrete spalling due to fire exposure , 2013 .

[2]  U. Schneider,et al.  An Experimental Study On Spalling Of High Strength Concrete Elements Under Fire Attack , 2000 .

[3]  Christian La Borderie,et al.  Parametrical study of transient thermal strain of ordinary and high performance concrete , 2013 .

[4]  Toshiro Kamada,et al.  Study of mechanisms of explosive spalling in high-strength concrete at high temperatures using acoustic emission , 2012 .

[5]  F. Delhomme,et al.  An experimental method for assessing the spalling sensitivity of concrete mixture submitted to high temperature , 2012 .

[6]  Zdenek P. Bazant,et al.  Analysis of Pore Pressure, Thermal Stress and Fracture in Rapidly Heated Concrete , 1997 .

[7]  G. Khoury.  Effect of fire on concrete and concrete structures , 2000 .

[8]  Lorenzo Domenichini,et al.  Rail Tunnel Risk Analysis , 2008 .

[9]  Puneet Arora,et al.  Effect of load on thermal spalling of reinforced concrete containing various mineral admixtures , 2013 .

[10]  C. Favotto,et al.  Effects of the addition of glass fibers, mica and vermiculite on the mechanical properties of a gypsum-based composite at room temperature and during a fire test , 2014 .

[11]  Seung-Young So,et al.  Properties of Strength and Pore Structure of Reactive Powder Concrete Exposed to High Temperature , 2014 .

[12]  Dimitrios Panias,et al.  Inorganic polymeric materials for passive fire protection of underground constructions , 2013 .

[13]  Jian‐Jun Zheng,et al.  A meso-level investigation into the explosive spalling mechanism of high-performance concrete under fire exposure , 2014 .