KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
권호 표지

Material Modeling of Concrete for Chloride Diffusivity Considering Carbonation of Concrete

중성화의 영향을 고려한 콘크리트의 염소이온 확산계수 산정에 대한 해석적 기법 연구

Yoon, In-Seok;Kim, Eun-Kyum;Lee, Chang-Su
윤인석;김은겸;이창수

  • Published : 20070700

⟨ Previous Next ⟩

Abstract

Chloride diffusivity of concrete is a crucial material parameter in service life modeling and durability designing of marine concrete. Many researches to deal with the issue have been accomplished. The ways for approach were very various from the empirical solution obtained by experimental result to image analysis to consider multi-scale modeling. One of the simpliest ways is to express this as a multi-factor function from the practical point of view, however, the effects of affecting factors on the chloride diffusivity of concrete were ambiguous in previous studies. Furthermore, the majority of these researches have not dealt with this issue combined with carbonation of concrete, although carbonation can significantly impact on the chloride diffusivity of concrete. The purpose of this study is to establish a fundamental approach to compute the chloride diffusivity of (non)carbonated concrete. The chloride diffusivity of concrete should be defined, based on the engineering and scientific knowledge of cement and concrete. The affecting parameters for chloride diffusivity are diffusivity in pore solution, tortuosity, micro-structural properties of hardened cement paste, volumetric portion of aggregate, and so on. These are taken into account in the calculation of the chloride diffusivity of noncarbonated concrete. For carbonated concrete, reduced porosity due to carbonation is calculated and this is used for calculating the chloride diffusivity. The results are compared with experimental data and published study.

Keywords

References

  1. Ababneh, A., Benboudjema, F., and Xi, Y. (2003) Chloride penetration in nonsaturated concrete. Journal of Materials in Civil Engineering, Vol. 15, No. 2, ASCE, pp. 183-191 https://doi.org/10.1061/(ASCE)0899-1561(2003)15:2(183)
  2. N.T. Build 492, Concrete, Mortar and Cement-Based Repair Materials: Chloride Migration Coefficient from Non-Steady-State Migration Experiment, Finland
  3. Cannan, P. TRANS. Inst. Chem. London Vol. 15, 1937 (It is mentioned in the paper of M.A. Knackstedt and X. Zang (1994) Direct Evalution of Length Scales and Structural Paramenters Assiciated with Flow in Porous Media. Vol. 50, No. 3, pp. 2134-2138
  4. Davis, H.T. (1997) The effective medium theory of diffusion in composite media. Journal of American Ceramic Society, Vol. 60, pp. 499-501 https://doi.org/10.1111/j.1151-2916.1977.tb14091.x
  5. Dykhuizn, R.C. and Casey, W.H. (1989) an analysis of solute diffusion in rocks. Geochim. Cosmochim, Acta 53, pp. 2797-2805 https://doi.org/10.1016/0016-7037(89)90157-9
  6. Garboczi, E.J. and Bentz, D.P. (1998) Multiscale analytical/numerical theory of the diffusivity of concrete. Advanced Cement Based Materials, Vol. 8, pp. 77-88 https://doi.org/10.1016/S1065-7355(98)00010-8
  7. Landauer, R. (1952) The electrical resistance of binary metallic mixtures. Journal of Applied Physics, Vol. 23, pp. 779-784 https://doi.org/10.1063/1.1702301
  8. Luciano, J. and Miltenberger, M. (1999) Prediction chloride diffusion coefficient from concrete mixture properties. ACI Material Journal, 96-M86, pp. 698-703
  9. Maekawa, K., Chaube, R., and Kishi, T. (1999) Modeling of Concrete Performance: Hydration, Microstructure Formation and Mass Transport. E & FN Spon
  10. Mota, M., Texeira, J.A., and Yelshin, A. (1998) Tortuosity in Bioseparations and its Application to Food Processes. 2nd Eurpean Symposium on Biochemical Engineering Science, Porto, pp. 93-98
  11. Ngala, V.T. and Page, C.L. (1997) Effect of carbonation on pore structure and diffusional properties of hydrated cement paste. Cement and Concrete Research, Vol. 27, No. 7, pp. 995-1007 https://doi.org/10.1016/S0008-8846(97)00102-6
  12. Papadakis, V.G. and Vayenas, C.G. (1991) Physical and chemical characteristics affecting the durability of concrete. ACI Materials Journal, Vol. 8, No. 2, pp. 186-196
  13. Saeki, T., Shinada, K., and Sasaki, K. (2006) Chloride ions diffusivity and micro-structure of concrete made with mineral admixtures. International RILEM-JCI Seminar on Concrete Durability and Service Life Planning, Concrete Life'06, Ein-Bokek, Dead Sea, Israel, pp. 129-135
  14. Saetta, A.V., Scotta, R.V., and Vitaliani, R.V. (1993) Analysis of chloride diffusion into partially saturated concrete. ACI Materials Journal, Vol. 90, 90-M47, pp. 441-451
  15. Tatlier, M. and Erdem-Senataler, A. (2004) Estimation of the Effective Diffusion Coefficients in Open Zeolite Coatings. Chemical Engineering Journal, Vol. 102, pp. 209-216 https://doi.org/10.1016/j.cej.2004.04.001
  16. Van Breugel, K. (1991) Simulation of Hydration and Formation of Structures in Hardening Cement-Based Materials. Ph. D Dissertation of Delft University of Technoloty, The Netherlands
  17. Van Dalen, S.H. (2005) 'Onderzoek naar de RCM methode (in Dutch) MSc-thesis, TU Delft, The Netherlands
  18. Welty, J.R., Wicks, C.E., Wilson, R.E. and Rorrer, G. (2001) Fundamentals of Momentum, Heat, and Mass Transfer. 4th Edition, John Wiley & Sons
  19. Wilke, C.R. and Chang, P. (1995) Correlation of diffusion coefficient in dilute solutions. Journal of American Institute of Chemical Engineering, Vol. 1
  20. Xi, Y. and Bazant, Z.P. (1999) Modeling chloride penetration in saturated concrete. Journal of Materials in Civil Engineering, Vol. 11, No. 1, ASCE
  21. Yu, B.O. and Li, J.H. (2004) A Geometry model for tortuosity of flow path in porous media. Chin. Phys. Lett. . Chinese Physical Society, Vol. 21, No. 8, pp. 1569-1571 https://doi.org/10.1088/0256-307X/21/8/044