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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51879

Title: A Nonlinear Theoretical Study of Modelling Chloride Diffusion in Concrete Containing Fly Ash and Slag
Authors: W.H.Tsao
M.T.Liang
J.J.Chang
M.Y.Fang
Contributors: 國立臺灣海洋大學:河海工程學系
Keywords: Chloride
Mathematical Model
Fly Ash
Slag
Pozzolan
Diffusion
Date: 2015-04
Issue Date: 2019-01-03T02:47:02Z
Publisher: Journal of Applied Science and Engineering
Abstract: Abstract: The principal objective of this paper is to investigate the modelling of chloride diffusion in fly
ash and slag concretes laden in chloride environments. The capacity of the concrete cementitious
system to bind chloride ions has an important effect on the rate of chloride ionic transport in concrete.
Four mathematical models concerning chloride binding in concrete are stated and used. The analytical
solution of Fick’s second law of nonlinear (diffusivity constant) diffusion in conjunction with initial
and boundary conditions is used as a predictive model. The experimental data obtained by Thomas and
Bamforth [Modelling chloride diffusion in concrete: Effect of fly ash and slag. Cement and Concrete
Research 1999;31:487495] was cited as input parameters. The results at the present study show that
after 30 years the predicted chloride profiles obtained by the nonlinear model may be one order of
magnitude lower than that of linear (diffusivity = constant) model. The nonlinear model associated
with four mathematical models related to chloride binding in concrete is not suitable to predict the
transport mechanism of chloride diffusion in concrete containing fly ash and slag. However, the
analytical solution of a nonlinear partial differential equation (PDE) in association with initial and
boundary conditions for the concentration of Cl in the aqueous phase [ ] Cl( ) aq
(in kg/m3 pore solution)
is proper to estimate the transport behavior of chloride diffusion in both fly ash and slag concretes. The
Cl bound in the solid phase [ ] Cl( )s
(kg/m3 concrete) can thus be computed algebraically. Further
research in-depth is obviously needed and suggested.
Relation: 18(2) pp.195-211
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51879
Appears in Collections:[河海工程學系] 期刊論文

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