Abstract
This paper deals with the characteristics of reinforcement corrosion in concrete beams under the influence ofsustained loads. The evolution and distribution laws of the reinforcement corrosion were measured periodically over time. Theresults show that sustained load exhibits a pronounced exacerbating effect on the reinforcement corrosion, and enlarges thenonuniformity level of corrosion as the load level increases. Accompanied with the continuous formation of the rust, thecorrosion rate was also observed to be highly nonlinear and time-dependent. Moreover, to visually and quantitatively analyze thedistribution of reinforcement corrosion, the 3D scanning technology combined with the probability statistics analysis wasadopted, and the observed nonuniformity can be well described by the Gumbel distribution. Finally, an approach based on thethree-phase spherical model was proposed to estimate the reinforcement corrosion, taking account of the effects of sustainedload on the changes of concrete porosity and oxygen diffusivity.
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