Title:
Modeling Chloride Transport in Concrete at Pore and Chloride Binding
Author(s):
Ki Yong Ann and Sung In Hong
Publication:
Materials Journal
Volume:
115
Issue:
4
Appears on pages(s):
595-604
Keywords:
chloride; diffusion; modeling; pore size distribution
DOI:
10.14359/51702194
Date:
7/1/2018
Abstract:
The present study concerns modeling of chloride diffusion in concrete by reflecting the pore size distribution and binding of chloride in the cement matrix. As factors that influence the chloride diffusion, water-cement ratio (w/c) and replacement ratio for blended cement concrete were taken. As a result, it was found that an increase in w/c and a decrease in the replacement ratio resulted in an increase in the fraction of effective pore volume for chloride transport, while chloride binding capacity decreases with w/c and increases with the replacement ratio. Also, the higher chloride binding capacity could cause an increase in total chlorides at concrete surface, which could enhance the concentration buildup rate at smaller cover depth in the long term. However, after reaching the limited chloride binding capacity, the diffusion coefficient decreased with time, implying that a reduction of the diffusion
rate could be attributed to the chloride binding.
Related References:
1. Thomas, M. D., and Bamforth, P. B., “Modelling Chloride Diffusion in Concrete: Effect of Fly Ash and Slag,” Cement and Concrete Research, V. 29, No. 4, 1999, pp. 487-495. doi: 10.1016/S0008-8846(98)00192-6
2. Ishida, T.; Iqbal, P. O. N.; and Anh, H. T. L., “Modeling of Chloride Diffusivity Coupled with Non-Linear Binding Capacity in Sound and Cracked Concrete,” Cement and Concrete Research, V. 39, No. 10, 2009, pp. 913-923. doi: 10.1016/j.cemconres.2009.07.014
3. Yamaguchi, T.; Negishi, K.; Hoshino, S.; Tanaka, T.; Negishi, K.; Hoshino, S.; and Tanaka, T., “Modeling of Diffusive Mass Transport in Micropores in Cement-Based Materials,” Cement and Concrete Research, V. 39, No. 12, 2009, pp. 1149-1155. doi: 10.1016/j.cemconres.2009.08.012
4. Promentilla, M. A. B.; Sugiyama, T.; Hitomi, T.; and Takeda, N., “Quantification of Tortuosity in Hardened Cement Pastes Using Synchrotron-Based X-Ray Computed Microtomography,” Cement and Concrete Research, V. 39, No. 6, 2009, pp. 548-557. doi: 10.1016/j.cemconres.2009.03.005
5. Bejaoui, S., and Bary, B., “Modeling of the Link between Microstructure and Effective Diffusivity of Cement Pastes Using a Simplified Composite Model,” Cement and Concrete Research, V. 37, No. 3, 2007, pp. 469-480. doi: 10.1016/j.cemconres.2006.06.004
6. Sergi, G.; Yu, S.; and Page, C., “Diffusion of Chloride and Hydroxyl Ions in Cementitious Materials Exposed to a Saline Environment,” Magazine of Concrete Research, V. 44, No. 158, 1992, pp. 63-69. doi: 10.1680/macr.1992.44.158.63
7. Martín-Pérez, B.; Zibara, H.; Hooton, R.; and Thomas, M., “A Study of the Effect of Chloride Binding on Service Life Predictions,” Cement and Concrete Research, V. 30, No. 8, 2000, pp. 1215-1223. doi: 10.1016/S0008-8846(00)00339-2
8. Glass, G., and Buenfeld, N., “The Influence of Chloride Binding on the Chloride Induced Corrosion Risk in Reinforced Concrete,” Corrosion Science, V. 42, No. 2, 2000, pp. 329-344. doi: 10.1016/S0010-938X(99)00083-9
9. Tumidajski, P. J., “Application of Danckwerts’ Solution to Simultaneous Diffusion and Chemical Reaction in Concrete,” Cement and Concrete Research, V. 26, No. 5, 1996, pp. 697-700. doi: 10.1016/S0008-8846(96)85006-X
10. Petcherdchoo, A., “Time Dependent Models of Apparent Diffusion Coefficient and Surface Chloride for Chloride Transport in Fly Ash Concrete,” Construction and Building Materials, V. 38, 2013, pp. 497-507. doi: 10.1016/j.conbuildmat.2012.08.041
11. Farahani, A.; Taghaddos, H.; and Shekarchi, M., “Prediction of Long-Term Chloride Diffusion in Silica Fume Concrete in a Marine Environment,” Cement and Concrete Composites, V. 59, 2015, pp. 10-17. doi: 10.1016/j.cemconcomp.2015.03.006
12. Garboczi, E., and Bentz, D., “Computer Simulation of the Diffusivity of Cement-Based Materials,” Journal of Materials Science, V. 27, No. 8, 1992, pp. 2083-2092. doi: 10.1007/BF01117921
13. Chaube, R.; Kishi, T.; and Maekawa, K., Modelling of Concrete Performance: Hydration, Microstructure and Mass Transport, CRC Press, Boca Raton, FL, 2005, 328 pp.
14. Mindess, S.; Young, F.; and Darwin, D., Concrete, second edition, Pearson Education, Upper Saddle River, NJ, 2003, 75 pp.
15. Katz, A., and Thompson, A., “Quantitative Prediction of Permeability in Porous Rock,” Physical Review B: Condensed Matter and Materials Physics, V. 34, No. 11, 1986, pp. 8179-8181. doi: 10.1103/PhysRevB.34.8179
16. Katz, A., and Thompson, A., “Prediction of Rock Electrical Conductivity from Mercury Injection Measurements,” Journal of Geophysical Research. Solid Earth, V. 92, 1987, pp. 599-607. doi: 10.1029/JB092iB01p00599
17. Satterfield, C. N., and Sherwood, T. K., The Role of Diffusion in Catalysis, Addison-Wesley, Reading, MA, 1963.
18. Klaewkla, R.; Arend, M.; and Hoelderich, W. F., “A Review of Mass Transfer Controlling the Reaction Rate in Heterogeneous Catalytic Systems,” Mass Transfer—Advanced Aspects, H. Nakajima, ed., InTech, Rijeka, Croatia, 2011, pp. 667-684.
19. Spiesz, P.; Ballari, M. M.; and Brouwers, H., “RCM: A New Model Accounting for the Non-Linear Chloride Binding Isotherm and the Non-Equilibrium Conditions between the Free- and Bound-Chloride Concentrations,” Construction and Building Materials, V. 27, No. 1, 2012, pp. 293-304. doi: 10.1016/j.conbuildmat.2011.07.045
20. ASTM C1218/C1218M-99, “Standard Test Method for Water-Soluble Chloride in Mortar and Concrete,” ASTM International, West Conshohocken, PA, 1999, 3 pp.
21. Song, H.; Lee, C.; Jung, M.; and Ann, K., “Development of Chloride Binding Capacity in Cement Pastes and Influence of the pH of Hydration Products,” Canadian Journal of Civil Engineering, V. 35, No. 12, 2008, pp. 1427-1434. doi: 10.1139/L08-089
22. Aligizaki, K. K., Pore Structure of Cement-Based Materials: Testing, Interpretation and Requirements, CRC Press, Boca Raton, FL, 2005, 72 pp.
23. Oner, A., and Akyuz, S., “An Experimental Study on Optimum Usage of GGBS for the Compressive Strength of Concrete,” Cement and Concrete Composites, V. 29, No. 6, 2007, pp. 505-514. doi: 10.1016/j.cemconcomp.2007.01.001
24. Dhir, R.; El-Mohr, M.; and Dyer, T., “Chloride Binding in GGBS Concrete,” Cement and Concrete Research, V. 26, No. 12, 1996, pp. 1767-1773. doi: 10.1016/S0008-8846(96)00180-9
25. BS 8110-1, “Structural Use of Concrete – Code of Practice for Design and Construction,” British Standards Institution, London, UK, 1985.
26. Ann, K. Y., and Song, H. W., “Chloride Threshold Level for Corrosion of Steel in Concrete,” Corrosion Science, V. 49, No. 11, 2007, pp. 4113-4133. doi: 10.1016/j.corsci.2007.05.007
27. Pack, S. W.; Jung, M. S.; Song, H. W.; Kim, S. H.; and Ann, K. Y., “Prediction of Time Dependent Chloride Transport in Concrete Structures Exposed to a Marine Environment,” Cement and Concrete Research, V. 40, No. 2, 2010, pp. 302-312. doi: 10.1016/j.cemconres.2009.09.023
28. Nokken, M.; Boddy, A.; Hooton, R.; and Thomas, M., “Time Dependent Diffusion in Concrete—Three Laboratory Studies,” Cement and Concrete Research, V. 36, No. 1, 2006, pp. 200-207. doi: 10.1016/j.cemconres.2004.03.030