abstract
A numerical model for enhanced service life prediction of concrete infrastructure is presented which includes transient analysis of processes during corrosion initiation as well as propagation stage. The temporal and spatial transition of Steel-Concrete Interface during depassivation events is described by a randomly varying chloride threshold function. As such random activation events can be accounted for, rather than having to pre-describe the anode size and location as in many existing models. The aim of the study is to investigate random spatial activation events in concrete structures in submerged zones based on dynamically changing boundary conditions on the rebar surface to control transition from passive to active state. Investigations are carried out to realize the sustainability of corrosion processes in limiting oxygen concentrations in dissolved seawater. The model showcases the numerical architecture, the associated concept of randomly varying chloride threshold and predicts that among other factors, the rate of oxygen strongly influences corrosion rate in submerged locations.
keywords
CHLORIDE-INDUCED CORROSION; REINFORCING STEEL; CARBON-STEEL; PORE SOLUTION; CALCAREOUS DEPOSITS; DIFFUSION; BEHAVIOR; MARINE; CEMENT; BARS
subject category
Construction & Building Technology; Engineering; Materials Science
authors
Mir, ZM; Hoche, D; Gomes, C; Sampaio, R; Bastos, AC; Maincon, P; Ferreira, MGS; Zheludkevich, ML
our authors
António Alexandre Cunha Bastos
Junior Researcher
Mário Guerreiro Silva Ferreira
Retired ProfessorProjects
Long Lasting reinforced Concrete for Energy Infrastructure under Severe Operating (LORCENIS)
acknowledgements
This research has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement No: 685445 (LORCENIS-Long Lasting Reinforced Concrete for Energy infrastructure under Severe Operating Conditions).