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**Harvard**

Tang, L. och Gulikers, J. (2007) *On the mathematics of time-dependent apparent chloride diffusion coefficient in concrete*.

** BibTeX **

@article{

Tang2007,

author={Tang, Luping and Gulikers, Joost},

title={On the mathematics of time-dependent apparent chloride diffusion coefficient in concrete},

journal={Cement and Concrete Research},

volume={37},

issue={4},

pages={589-595},

abstract={This paper provides an improved mathematical analysis of chloride penetration into concrete employing a time-dependent diffusion coefficient
for the solution of Fick's second law of diffusion. In the paper the possible errors caused by the application of oversimplified mathematical
expressions used in some models for the evaluation of service life of reinforced concrete structures are discussed. The results from this
mathematical analysis demonstrate that some models based on the oversimplified error function complement (ERFC) solutions may easily
overestimate the service life by orders of magnitude, especially when the age factor is high. Some chloride profiles after up to 10 years' field exposure were used to compare the oversimplified with the improved models. The results show that both the oversimplified and the improved
models fairly well predict the 10 years' chloride ingress in Portland cement concrete, but the oversimplified ERFC model significantly underestimates the chloride ingress in concrete with fly ash.},

year={2007},

keywords={Concrete; Diffusion; Durability; Modeling; Transport properties},

}

** RefWorks **

RT Journal Article

SR Print

ID 55303

A1 Tang, Luping

A1 Gulikers, Joost

T1 On the mathematics of time-dependent apparent chloride diffusion coefficient in concrete

YR 2007

JF Cement and Concrete Research

VO 37

IS 4

SP 589

OP 595

AB This paper provides an improved mathematical analysis of chloride penetration into concrete employing a time-dependent diffusion coefficient
for the solution of Fick's second law of diffusion. In the paper the possible errors caused by the application of oversimplified mathematical
expressions used in some models for the evaluation of service life of reinforced concrete structures are discussed. The results from this
mathematical analysis demonstrate that some models based on the oversimplified error function complement (ERFC) solutions may easily
overestimate the service life by orders of magnitude, especially when the age factor is high. Some chloride profiles after up to 10 years' field exposure were used to compare the oversimplified with the improved models. The results show that both the oversimplified and the improved
models fairly well predict the 10 years' chloride ingress in Portland cement concrete, but the oversimplified ERFC model significantly underestimates the chloride ingress in concrete with fly ash.

LA eng

OL 30