Niyazi Özgür Bezgin
Istanbul University, Turkey
Title: An experimental evaluation to determine the required thickness of passive fire protection layer for high strength concrete tunnel segments
Biography
Biography: Niyazi Özgür Bezgin
Abstract
This paper considers the use of high strength concrete segments for tunnels constructed by the tunnel boring method. 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 spall 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.