Title: Validation of models for prediction of chloride ingress in concrete exposed in de-icing salt road environment

Authors: Luping Tang; Anders Lindvall

Addresses: Department of Civil and Environmental Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden; CBI Swedish Cement and Concrete Research Institute, Box 857, SE-501 15 Borås, Sweden. ' Central Laboratory, Thomas Concrete Group AB, Ringögatan 14, SE-417 07 Gothenburg, Sweden

Abstract: This paper presents the results from validation of models for prediction of chloride ingress in concrete exposed in de-icing salt road environment. Three models including the simple error-function complement (ERFC) model, the DuraCrete model and the ClinConc model, were evaluated using the measurement data collected from both the field exposure site after over ten years exposure and the real road bridges after 25-30 years in service. The sensitivity of input parameters in each model is analysed. The results show that, among different input parameters, the age factor is the most sensitive one. The simple ERFC model significantly overestimates chloride ingress. The DuraCrete model, if the input parameters are properly selected, may give a reasonably good prediction, otherwise often underestimates chloride ingress. The ClinConc model in general gives fairly good predictions for chloride ingress in de-icing salt road environment with heavy traffic at high speed.

Keywords: cement; chloride ingress; concrete corrosion; de-icing salt; diffusion; concrete durability; modelling; road environment; service life; model validation; chloride penetration; road de-icing; age factor; heavy traffic; traffic speed.

DOI: 10.1504/IJSTRUCTE.2013.050766

International Journal of Structural Engineering, 2013 Vol.4 No.1/2, pp.86 - 99

Available online: 02 Dec 2012 *

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