Abstract
The main cause of ageing damage in reinforced concrete structures is reinforcement corrosion. Damage can be detected visually as coincident cracks along the reinforcement bar, which are significant of both reduction of the re-bar, cross-section and loss of bond strength for reinforced concrete. The reinforced concrete is one of the most widely used engineering materials as final lining of tunnels. The corrosion is common durability problems that have significant effect on the tunnel performance. This study intends to analysis reinforcement concrete corrosion at the tunnel lining by applying temperature expansion theory on steel through numerical simulation process, with expansive force effect. The thickness of concrete cover and the diameter of steel bar have an impact on the stress for reinforcement concrete during propagation of corrosion process. The corrosion cracks appear at the corner of a tunnel lining then in invert and vault because the maximum stress will be in the corner then in invert and vault. The internal force in the concrete lining changes differently when the corrosion rate change.
Highlights
Tunnel structures are becoming of increasing importance for the infrastructure
The corrosion cracks appear at the corner of a tunnel lining in invert and vault because the
The results show the concrete cover has positive effect on the increasing crack with corrosion rate increase
Summary
Tunnel structures are becoming of increasing importance for the infrastructure Most of these tunnel structures are constructed from steel reinforced concrete with a design service life in excess of 100 years. The corrosion of reinforcement bar is considered as the most prevalent mode of deterioration that affecting on the serviceability, safety and structural integrity of tunnel. Both the inner and outer wall surface of tunnel structures exposed to aggressive exposure conditions. In view of the great economic importance of tunnel structures, the severe environmental exposure conditions, the limited possibilities for inspection, maintenance and repair during service, as well as factors related to safety and serviceability, an urgent need has emerged to critically evaluate the process of reinforcement corrosion in a tunnel environment. The main idea of model is used the temperature theory to simulate the corrosion on second tunnel lining
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