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http://dx.doi.org/10.4334/JKCI.2015.27.1.085

Analysis on Adsorption Rate & Mechanism on Chloride Adsorption Behavior with Cement Hydrates  

Yoon, In-Seok (Dept. of Construction Info. Eng., Induk University)
Publication Information
Journal of the Korea Concrete Institute / v.27, no.1, 2015 , pp. 85-92 More about this Journal
Abstract
The chloride ions, responsible for the initiation of the corrosion mechanism, intrude from the external medium into the concrete. A part of the intruding chloride ions will be retained by the hydration products of the binder in concrete, either through chemical adsorption or by physical adsorption. Since the hydration products of cement are responsible for the chloride binding in concrete, this study focused on the chloride binding in individual hydrate. The purpose of this study is to explore the time dependant behaviors of chloride ions adsorption with cement hydrates, focused on its mechanism. AFt phase and CH phase were not able to absorb chloride ion, however, C-S-H phase and AFm phase had a significant chloride adsorption capacity. In particular, AFm phase showed a chemical adsorption with slow rate in 40 days, while C-S-H phase showed binding behaviors with 3 stages including momentary physical adsorption, physico-chemical adsorption, and chemical adsorption. Based on the results, this study suggested theoretical approach to depict chloride adsorption behavior with elapsed time of C-S-H phase and AFm phase effectively. It is believed that the approach suggested in this study can provide us with a good solution to understand the mechanism on chloride adsorption with hydrates and to calculate a rate of chloride penetration with original source of chloride ions, for example, marine sand at initial time or sea water penetration later on.
Keywords
physical adsorption; chemical adsorption; chloride binding; C-S-H; AFm;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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1 Tang, L. and Nilsson, L. O., "Chloride Capacity and Binding Isotherms of OPC Paste and Mortars", Cement and Concrete Research, Vol. 23, 1993, pp. 247-253.   DOI   ScienceOn
2 Bigas, J. P., Lambert, F., and Ollivier, J. P., "An Original Method to Determine the Nonlinear Chloride Binding Isotherm from Bulk Specimens of Mortar", Proceedings of the International RILEM Workshop on Chloride Penetration into Concrete, Nillson, L.-O., Ollivier, J. P.(eds.), St-Remyles-Chevreuse, France, 1995, pp. 43-49.
3 James, K. R., Yu, P., and Kalinichev, A., "Chloride Binding to Cement Phases: Exchange Isotherm, 35Cl NMR and Molecular Dynamic Modeling Studies", J. Skalny, J. Gebauer, I. Odler(eds.), Materials Science of Concrete: Calcium Hydroxide in Concrete, American Ceramic Society, Ohio, 2001, pp. 77-92.
4 Hirao, H., Yamada, K., Takahashi, H., and Zibra, H., "Chloride Binding of Cement Estimated by Binding Isotherms of Hydrates", Journal of Advanced Concrete Technology, Vol. 3, No. 1, 2005, pp. 77-84.   DOI
5 Rolando, M. A. R. M., "Adsorption and Diffusion in Nanoporous Materials", CRC Press, 2006.
6 Elakneswaran, Y., Nawa, T., and Kurumisawa, K., "Electrokinetic Potential of Hydrated Cement in Relation to Adsorption of Chloride", Cement and Concrete Research, Vol. 39, No. 4, 2009, pp. 340-344.   DOI   ScienceOn
7 Yu, P., "Spectroscopic Investigation of Cement Hydrate Phases and their Chloride Binding Properties", Ph D Thesis., Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, USA, 2000.
8 Kirkparick, R. J., Yu, P., and Kalinichev, A., "Chloride Binding to Cement Phases: Exchange Isotherm, 35Cl NMR Molecular Dynamic Modeling Studies", Materials Science of Concrete: Calium Hydroxide in Concrete, Skalny, J., Gebauer, J., and Odler, I.(eds.), American Ceramic Society, 2001, pp. 77-93.
9 Hosokawa, Y., Yamada, K., Johannesson, B. F., and Nilsson, L. O., "Reproduction of Chloride Ion Binding in Hardened Cement Paste Using Thermodynamic Equilibrium Models", Taiheiyo Cement Kenkyu Hokoku, Japan, Vol. 151, 2006, pp. 1-12.
10 Marinescu, M., and Brouwers, J., "Chloride Binding Related to Hydration Products, Part I Ordinary Portland Cement, Advances in Modeling Concrete Service Life", Proceedings of 4th international RILEM PhD Workshop (eds. Andrade, C., and Gulikers, J.), Spain, RILEM, 2012, pp. 125-133.
11 http://en.wikipedia.org/wiki/Intercalation_(chemistry).
12 Masel, R. I., "Principles of Adsorption and Reaction on Solid Surfaces", John Wiley & Sons, 1996.
13 Yoon, I. S., "Theoretical Analysis of Critical Chloride Content in (Non)Carbonated Concrete Based on Characteristics of Cement Hydration", Journal of the Korea Concrete Institute, Vol. 19, No. 3, 2007, pp. 367-375.   과학기술학회마을   DOI   ScienceOn
14 Yoon, I. S., "Analytical Modeling for Microstructural Permeability Coefficient of (Non)Carbonated Concrete", Journal of the Korea Concrete Institute, Vol. 2, No. 3, 2007, pp. 255-264.   과학기술학회마을   DOI   ScienceOn
15 Yoon, I. S., "Material Modeling of Concrete for Chloride Diffusivity Considering Carbonation of Concrete", Journal of the KSCE, Vol. 27, No. 4A, 2007, pp. 617-629.   과학기술학회마을
16 Yoon, I. S., "Chloride Binding Behaviors by AFm and C-S-H in Artificial Pore Solution", Nordic Concrete Research, Vol. 43, 2011, The Nordic Concrete Federation, pp. 135-138.
17 Lim, G., "Principles of Adsorption Engineering and Science", Doyang Publishing, 2008.
18 De Schutter, G., "Damage to Concrete Structures", CRC Press, 2013.
19 Zibra, H., "Binding of External Chloride by Cement Pastes", PhD Thesis, Department of Building Materials, University of Toronto, Canada, 1989.
20 Tritthart, J., "Chloride Binding in Cement, I. Investigation to Determine the Composition of Pore Water in Hardened Cement", Cement and Concrete Research, Vol. 19, 1989, pp. 586-594.   DOI   ScienceOn
21 Arya, C. Buenfeld, N. R., and Newmann, J. B., "Assessment of Simple Methods of Determining the Free Chloride of Cement Paste", Cement and Concrete Research, Vol. 17, No. 6, 1987, pp. 907-918.   DOI   ScienceOn