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Rebr Tunnel Sectioning Theory

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Introduction
Tunnel lining is a vital part of the tunnel construction. It provides the support and the stability to the tunnel. In 1895, tunnel linings were constructed with the brick, timber and rebars that are arranged to bear tensile stresses. In recent years durability issues have become more important in terms of serviceability for underground infrastructures. However, rebars generally need protection against water and corrosion, which cannot be affected their durability and that can be obtained by overcoming the concrete porosity and crack grith. The former can be achieved by adopting a cementitious matrix and water/ cement ratio. The later can be obtained by using fibre reinforced concrete and Steel Fiber reinforced concrete, which is the optimal solution for the above problems. Moreover, the combination of fibre/Steel fibre reinforcement and concrete may contribute noticeably surplus tensile strength at a crack. This essay aims at investigating the durability of FRC and REBAR tunnel …show more content…

Broomfield (2007) states “the corrosion starts due to the discharge of electrons during the oxidation process at the anode (Eq. 2.1). These electrons are utilised at some other location in order to maintain electrical neutrality. Therefore, electrons are collected at the cathodic site where hydroxyl ions form upon reaction with oxygen and water (Eq. 2.2)”. The initial step for forming corrosion rust is the anodic and cathodic reaction. The main controlling factors that accelerate the corrosion process are oxygen and moisture. In this process, many reactions take place between iron and hydroxyl ions in the presence of oxygen and moisture. Further equation shows the series of chemical reactions that take place to form

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