Effect of the concrete's component on the heat shock bearing capacity of tunnel linings

Abstract

During the last decades, the increasing number of incidents in road and railway tunnels have attracted public attention to the danger of tunnel fires. These incidents established that quickly accumulating, huge amount of evolved heat impairs the reinforced concrete structures of tunnel linings. Designing of firebearing linings, it is necessary to understand the behaviour of the linings impacted by bumping heat load. In this paper, the results of our heat load examinations of residual strength (compressive strength and split-tensile strength) parameters on different mixtures of concrete were summarised.

Application of the Heavy-Weight Concrete as a Fire-Resistance Nuclear Concrete

“…However, constituents of concrete, such as aggregate, cement type, and chemical, mineral or nanoparticle admixture, directly affect these properties. In nuclear buildings, shielding properties are directly affected by the iron contents and the amount of fixed water [7][8][9].…”

Integrated Approach for Post-fire Reinforced Concrete Structures Assessment

“…Both ends of each column were considered constrained and not exposed to fire, and variations in their centre-of-gravity position considered negligible. Concerning the central columns (8 and 5), it was possible to record the whole perimeter, while in the case of lateral columns (4,6,7,9), only one side was exposed to the fire and consequently recorded. In the latter case, the centre-of-gravity position was determined considering design characteristics for the other 3 sides.…”

“…These problems become more serious in the case of large and strategic buildings that perform an important service which cannot be interrupted without high social costs, see [1][2][3][4][5]. If the fire is followed or anticipated by an explosion, materials and structures are pushed to the limit.…”