Comparison of Standardized Methods for Determining the Diffusion Coefficient of Chloride in Concrete with Thermodynamic Model of Migration

Author:

Szweda ZofiaORCID,Gołaszewski JacekORCID,Ghosh Pratanu,Lehner PetrORCID,Konečný PetrORCID

Abstract

This research paper is the result of observations made during tests according to various standards carried out on behalf of industry. The article presents diffusion coefficient values calculated according to the thermodynamic migration model for twenty different concrete mixes and some selected mixes of the codified approaches known as ASTM 1202, NT BUILD 443, NT BUILD 492, ASTM 1556. The method used here, according to the thermodynamic model of migration, allows determination of the value of the diffusion coefficient after short studies of the migration of chloride ions into concrete and was described in earlier works by one of the authors. Unfortunately, when using standard methods, the values of diffusion coefficients differ significantly from each other. In each concrete, diffusion tests were carried out in the conditions of long-term natural diffusion to verify the values determined by standard methods and according to the thermodynamic model of migration. The analysis conducted for this research paper reveals that the chloride permeability test method according to the standard ASTM C1202-97 has an almost 2.8-fold greater dispersion of the obtained results compared to the thermodynamic model of migration. It was observed that the standard NT BUILD 492 has a 3.8-fold dispersion of results compared to the method with the thermodynamic model of migration. The most time-consuming method is the standard method NT BUILD 443. The largest 3.5-fold dispersion of values concerning the reference value are observed in that method. Moreover, a method based on a thermodynamic migration model seems to be the best option of all analyzed methods. It is a quite quick, but laborious, method that should be tested for a larger number of concrete mixes. A great advantage of this method is that it is promising for a wide range of concrete mixtures, both plain concrete and concrete with various additives and admixtures, as well as high-performance concrete.

Funder

European Union from the European Social Fund in the framework of the project “Silesian University of Technology as a Center of Modern Education based on research and innovation”

Czech Science Agency

Publisher

MDPI AG

Subject

General Materials Science

Reference59 articles.

1. Determination of chloride diffusivity through partially saturated Portland cement concrete by a simplified procedure;Climent;Constr. Build. Mater.,2011

2. Yang, J., Zhang, P., and Feng, J. (, January 24–26). Advances in Chloride Ion Diffusion Coefficient. Test Research for Concrete. Proceedings of the First International Conference on Innovation in Low-Carbon Cement and Concrete Technology (ILCCC2019), University College, London, UK.

3. Durability of steel reinforced concrete in chloride environments: An overview;Shi;Constr. Build. Mater.,2012

4. Determining the Apparent Chloride Diffusion Coefficient of Cementitious Mixtures by Bulk Diffusion;Test;Designation 1556-11a,2003

5. (1995). Concrete Hardened: Accelerated Chloride Penetration (Standard No. NT BUILD-443).

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