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Chloride binding of cement-based materials subjected to external chloride environment - A review
Yuan, Q.; Shi, C.; De Schutter, G.; Audenaert, K.; Deng, D. (2009). Chloride binding of cement-based materials subjected to external chloride environment - A review. Constr. Build. Mater. 23(1): 1-13. hdl.handle.net/10.1016/j.conbuildmat.2008.02.004
In: Construction and Building Materials. Elsevier: Oxford. ISSN 0950-0618, more
Peer reviewed article  

Available in  Authors 
    VLIZ: Open Repository 280332 [ OMA ]

Keyword
    Marine
Author keywords
    Chloride ion; Binding; Cement-based materials; Binding isotherm

Authors  Top 
  • Yuan, Q.
  • Shi, C.
  • De Schutter, G., more
  • Audenaert, K., more
  • Deng, D.

Abstract
    This paper reviews the chloride binding of cement-based materials subjected to external chloride environments. Chloride ion exist either in the pore solution, chemically bound to the hydration products, or physically held to the surface of the hydration products. Chloride binding of cement-based material is very complicated and influenced by many factors, such as chloride concentration, cement composition, hydroxyl concentration, cation of chloride salt, temperature, supplementary cementing materials, carbonation, sulfate ions and electrical field etc. Four different types of binding isotherms, namely linear, Langmuir, Freundlich and BET binding isotherm have been proposed to describe the relationship between free and bound chloride, none of which can accurately express the relationships between free and bound chloride within the whole concentration range. Freundlich binding isotherm seems to be the most approximate one. However, some field data fit linear isotherm well. This may be ascribed to the leakage of hydroxyl ion. Many service life prediction models based on diffusion mechanism alone have been proposed during the past two decades. If chloride ion binding is not considered in the models, it underestimates the predicated service life.

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