Abstract
The reinforced concrete (RC) circular element is usually simplified as slab one on the issue of chloride diffusion simulation, without considering the effect of the geometrical shape. In the paper, a modified slab diffusion model is proposed for circular section. A formulation for estimating the error caused by neglecting the effect of shape on chloride diffusion is derived. The formulation demonstrates that radius significantly affect the error. When shape is neglected, the effects of model parameters, including the diffusion coefficient, radius, cover concrete thickness and age factor, on the corrosion initiation time are investigated. The result shows the radius has a slight effect on calculating the corrosion initiation time compared with other model parameters. Furthermore, the influence of shape on estimating on reliability index for different service time is also discussed. A guideline is proposed for properly using the modified slab diffusion model instead of the original one to predict service life. Finally, the impact of the shape of the RC circular column on the durability design against chloride corrosion is studied. The design result when the column is simplified as a slab element indicates a lower required minimum concrete cover thickness. The minimum thickness should be improved by 5 mm as a conservative choice based on the result of the slab element.
Highlights
Reinforced concrete circular columns are widely used for infrastructure construction
Considering concrete material in a section as homogeneous, the comparison between the distribution of chloride concentration at whole section homogeneous, the comparison between the distribution of chloride concentration at whole section homogeneous, the comparison between the distribution of chloride diffusion concentration section estimated by modelatis iswhole displayed in estimated by the the numerical numerical model model and and that that estimated estimated by by the the circular circular diffusion model displayed in estimated by the numerical model and that estimated by the circular diffusion model is displayed in
A circular diffusion model is first deduced by considering the diffusion coefficient as a time-dependent variable
Summary
Reinforced concrete circular columns are widely used for infrastructure construction. In the Duracrete report, a simplified 1D diffusion mathematical model considering the environment, test, and execution factors into diffusion coefficients was adopted as the basic model in durability design [5]. This diffusion model in the Duracrete report is widely used to predict the time to corrosion initiation of RC structure subject to. In this paper, considering time-dependence and shape effect, a basic diffusion model of chloride penetration in an RC circular column is deduced. The durability design difference between the two models is discussed for an RC circular column
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