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2020 Vol.10, Issue 3 Preview Page

Research Article

Necessity to Modify Fick Law considering Liquid Water Front inside Cover Concrete
Islam Shafiqul1*
kishi Toshiharu2
1Professor, Department of Civil Engineering, Rajshahi University of Engineering & Technology, Bangladesh
2Professor, Institute of Industrial Science, The University of Tokyo, Japan
*Corresponding Author
December 2020. pp. 25-44
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Abstract

Most common method for durability analysis of RC structure against chloride attack is the Fick law of diffusion where diffusion coefficient is treated as the base parameter. Inspection data of chloride profile from some real structures does not obey the rule of Fick law for the case of chloride ingress, suggesting the influence of other unknown parameter. Recent research comes up with the conclusion that water penetration front is another key issue regarding cover quality which dramatically change the service life as well as LCC of RC structure. It is found that Fick law can not predict the chloride distribution precisely for very good type of concrete where water can penetrate few millimeters to centimeter. In this aspect, laboratory experiments are done to formulate the behavior of liquid water front considering type of material used in concrete, exposure condition and mix proportion as the parameters. Furthermore, Fick law is modified using the developed model formulas and suitable analysis method is proposed. It is also shown that the Torrent permeability which can easily be obtained from inspection of existing structure can fix suitable analysis method. This work highlights the suitability of analysis methods by modifying Fick’s Law using empirical relationship found from experiments, and is therefore, clearly distinguish the concretes based on their cover qualities.

Keywords
Liquid Water Front
Modified Fick Law
Standard Deviation
References
1
Bear, J., "Dynamics of Fluid in Porous Media", Dover Publications, Inc. New York
2
Freeze, R. A. and Cherry, J. A., "Groundwater", Prentice-Hall, Inc. New Jersey, 1979
3
Halamickova, P., Rachel, J., Detwiler, Bentz, D.P., Edward, J., Garboczi, "Water Permeability and Chloride Ion Diffusion in Portland Cement Mortars: Relationship to Sand Content and Critical Pore Diameter", Cement and Concrete Research, vol. 25, No. 4, pp. 790-802, 1995 10.1016/0008-8846(95)00069-O
4
Hindmarsh, A.C., Gresho, P.M., and Griffiths, D.F., "The stability of explicit Euler time-integration for certain finite difference approximations of the multi- dimensional advection-diffusion equation", Int. J. Numer. Methods Fluids, 4, 853-897, 1984 10.1002/fld.1650040905
5
Ostrowski J., "Testing for Concrete Durability"
6
Sousa, E., "The controversial stability analysis", Applied Mathematics and Computation, 145, 777-794, 2003 10.1016/S0096-3003(03)00274-1
7
Takahashi, Y., "Chloride ion Penetration Behavior in Concrete focused on Liquid Water Movement", Masters thesis submitted to The University of Tokyo, 2010
8
Takeda, N., Sogo, S., Sakoda, S., Idemitsu, T., "An Experimental Study on Penetration of Chloride ions into Concrete and Corrosion of Reinforcing Bars in Various Marine Environments", Concrete Library of JSCE, No. 34, pp. 89-108, December 1999
Information
  • Publisher :Korea Institute of Construction Engineering and Management
  • Publisher(Ko) :한국건설관리학회
  • Journal Title :Journal of Construction Engineering and Project Management
  • Volume : 10
  • No :3
  • Pages :25-44
  • Received Date :2020. 07. 22
  • Revised Date :2020. 12. 22
  • Accepted Date : 2020. 12. 31
  • DOI :https://doi.org/10.6106/JCEPM.2020.10.3-4.025
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