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Fick's 2nd law - Complete solutions for chloride ingress into concrete – with focus on time dependent diffusivity and boundary condition

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Author

Summary, in English

This report focuses on models of chloride ingress into concrete that are based on mathematical solutions of Fick's second law. In recent years a lot of confusion has been identified concerning these models. In some cases time-dependencies of diffusivity have been used in a mathematically incorrect way. In other cases field and laboratory data from one way of describing the time-dependency of these diffusivities has been used in models that are based on another model. This is now clarified in this report. Some of the clarifications are completely new, concerning the relationship between the age exponents in the time-dependency of the "instantaneous" and the "achieved" diffusivity.

Publishing year

2009

Language

English

Publication/Series

Report TVBM

Document type

Report

Publisher

Division of Building Materials, LTH, Lund University

Topic

  • Materials Engineering

Keywords

  • mathematical solutions
  • surface chloride
  • diffusivity
  • time-dependent
  • concrete
  • chloride
  • Fick's 2nd law

Status

Published

Report number

3146

ISBN/ISSN/Other

  • ISSN: 0348-7911
  • TVBM-3146