Abstract
The presented article demonstrates the probabilistic method based modeling of the 2D chloride ingress into reinforced concrete structures with respect to concrete heterogeneity and epoxy-coated steel reinforcement. Spatial change of concrete diffusion is assessed through the investigation of random variation of the ability of concrete to resist chloride ingress. Time-dependent chloride concentration at the reinforcement level in both homogeneous and heterogeneous models is comparatively considered taking into account of the influence of reinforcement protection as well as the defects and holidays of the coating. Expansion optimal linear estimation method is exploited to generate a random field for the structure at the mesoscale and correlation length is employed to simplify the modeling process. Preliminary analyses of the built model are conducted in both deterministic and probabilistic solutions under the scheme of the finite element method. Thus, possibility of such analyses is exploited.
Highlights
Durability of concrete exposed to aggressive agents has been a worldwide research topic in recent decades [1,2,3,4,5]
The of the distribution was on focusing the deterministic case on Figure previous study of of thechloride authorsconcentration was upgraded in illustrated this research on the probabilistic solution
The In main were theofinclusion of the reinforcement coating influence into the Figure changed at the reinforcement level due to the spatial change ofdata
Summary
Durability of concrete exposed to aggressive agents has been a worldwide research topic in recent decades [1,2,3,4,5]. It is desirable to build a model that would allow a chloride profile reflecting concrete heterogeneity by which spatial variation of RC material is explored at the mesoscale Such a model is represented in case of chloride ingress in a work of Jing et al (2007) [23]. In probability approach based modeling, correlation length, a parameter representing the rate of fluctuation of random variables was introduced and considered as a characteristic length of the random field [25,30] This helped to simplify the modeling process. It should be acknowledged that reinforcement protection is an important factor in concrete models related to chloride ingress This aspect has been considered in many research works, e.g., [11,31,32] on which reinforcing bars are coated by epoxy resin in order to increase the time of corrosion initiation. The comparison is made on the deterministic as well as the probabilistic level
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