关键词: 弯曲应力, 珊瑚混凝土, 保护层厚度, 钢筋种类, 极化曲线, 电化学阻抗谱

Abstract: This paper includes handmade equipment to conduct bending stress loading experiments on coral concrete members. And the influence of bending stress on corrosion of various reinforcement types of steel bar in coral concrete with various protective layer thicknesses was investigated. ABAQUS finite element analysis software was used to simulate the stress magnitude and stress state of the reinforced coral concrete member model under bending stress. The corrosion of several types of steel reinforcement under bending stress was also compared and examined using the polarisation curves and electrochemical impedance spectrum analysis. The findings indicate that handmade equipment can better simulate the corrosion of reinforcing steel under the coupling effect of bending stress and marine environment, and the corrosion resistance of reinforcing steel decreases with increasing bending stress. The effect of increasing bending stress on reinforcement corrosion is significant within a range of protective layer thickness (0~30 mm), but as protective layer thickness increases to a certain point (50 mm), the effect of increasing bending stress on reinforcement corrosion gradually decreases. The influence of bending stress on reinforcement from strong to weak is HPB400 steel bar, galvanized steel bar, 304 stainless steel bar.

Key words: bending stress, coral concrete, protective thickness, reinforcement type, polarization curve, electrochemical impedance spectra (EIS)