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Enhanced Predictive Modelling of Steel Corrosion in Concrete in Submerged Zone Based on a Dynamic Activation Approach

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.
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Category

Academic article

Language

English

Author(s)

  • Zahid Mohammad Mir
  • Daniel Hoche
  • Celestino Gomes
  • Rui Sampaio
  • Alexandre C Bastos
  • Philippe Mainçon
  • M.G.S. Ferreira
  • Mikhail L Zheludkevich

Affiliation

  • SINTEF Industry / Materials and Nanotechnology
  • University of Aveiro
  • University of Kiel
  • Helmut Schmidt University/University of the Federal Armed Forces of Hamburg
  • Helmholtz-Zentrum Geesthacht

Year

2019

Published in

International Journal of Concrete Structures and Materials

ISSN

1976-0485

Volume

13

Issue

11

Page(s)

1 - 18

View this publication at Norwegian Research Information Repository