Simulation of Chloride Penetration Into Hardened Concrete


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Title: Simulation of Chloride Penetration Into Hardened Concrete

Author(s): T. Maruya, S. Tangtermisirikul, and Y.Matsuoka

Publication: Special Publication

Volume: 145


Appears on pages(s): 519-538

Keywords: carbonation; chlorides; condensation; hardened concretes; models; porosity; wetting and drying tests; Materials Research

Date: 5/1/1994

A mathematical model for simulating chloride movement in hardened concrete is proposed. Total chloride in concrete is considered to be composed of fixed and free chlorides. Fixed chloride content is considered a function of total chloride content. Free chloride is the only chloride that is movable according to its concentration gradient. Models for dealing with the effect of carbonation, change of water content in concrete due to drying and wetting, cyclic wetting and drying with salt water, and chloride condensation at the surface layer are proposed. The change of pore volume due to carbonation is considered in analyzing water vapor movement. The applicability of the models was checked using the authors' test results. The analytical results proved to be qualitatively satisfactory.