Thermal Effects on Chloride Diffusion in Concrete


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Title: Thermal Effects on Chloride Diffusion in Concrete

Author(s): B. D. Miller, M. A. Miltenberger, and E. K. Attiogbe

Publication: Special Publication

Volume: 209


Appears on pages(s): 701-716

Keywords: chloride diffusion; corrosion; thermal effects

Date: 9/26/2002

Corrosion of reinforcing steel in concrete usually initiates from chloride ingress. The temperiiture of thd service environment and cementitious material blends influence chloride ingress. This paper presents data from a multi-year experiment designed to illustrate the effects of temperature and supplementary cementing materials on chloride diffusion in concrete. This experiment consists of six concrete mixtures, five of which contained different supplementary cementing materials. Test specimens were submerged in 6% sodium chloride solution, and stored at a temperature of 10, 23, and 32 C for approximately three and one-half years. The chloride ingress data are presented, and the impact of temperature on chloride diffusion coefficients along with its implications for corrosion service life modeling am discussed presently, most service life prediction models adjust for the service temperature of a structure by using the Arrhenius Equation. The time-to-cormsion data obtained in this study suggests that the net result of temperature related effects does not match the predictions based on the Arrhenius Equation.