Abstract
Degradation of the bond between I-shaped steel and concrete due to the corrosion of I-shaped steel significantly affects the durability of steel reinforced concrete (SRC) structures. This study carried out the accelerated corrosion test and push-out test to study the bond-slip behavior and characteristics considering the corrosion of I-shaped steel, and test results indicated that: (1) The performance degradation of the bond-slip accelerated when the corrosion ratio reached 12%. (2) The corrosion failure pattern of SRC experienced slip phase and destruction phase in the rising stage. (3) Based on the principle of minimum potential energy, the bond stress was obtained only with the load and the displacement in the free end and the loading end. (4) Meanwhile, a new bond-slip degradation model was developed using the interface damage theory. Finally, the proposed model agreed with the experimental results.
Highlights
The subsea tunnels are often constructed by drilling and blasting method
The composite lining composed of initial support and secondary lining is often used in the subsea tunnel support system constructed by drilling and blasting method
Bryson et al [23] performed the first push-out test to studied the effect of section steel surface condition on bond strength of steel reinforced concrete, the results showed that the average bond strength of section steel either freshly sandblasted or sandblasted and allowed to rust was close, but it is about 30% higher than that of section steel with normal rust and mill scale
Summary
The subsea tunnels are often constructed by drilling and blasting method. Tunnel (53.8 km) was constructed by drilling and blasting method [2]. Bay Submarine Tunnel (6.17 km) in Qingdao [4]. The composite lining composed of initial support and secondary lining is often used in the subsea tunnel support system constructed by drilling and blasting method. Since SRC has several advantages over the traditional reinforced concrete (RC): these include high bearing capacity, high rigidity, good ductility and energy dissipation [5,6], I-shaped steel is generally installed in the initial support in the soft rock section of the subsea tunnel. The I-shaped steel corrosion in the initial support of subsea tunnels occurred due to the electrochemical action caused by chloride ions invasion
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