Abstract

LIZARAZO MARRIAGA, Juan  and  CLAISSE, Peter. The influence of the blast furnace slag replacement on chloride penetration in concrete . Ing. Investig. [online]. 2011, vol.31, n.2, pp.38-47. ISSN 0120-5609.

Corrosion of steel reinforcement due to chloride penetration is the greatest cause of durability problems in concrete; intense international research has been carried out to understand and avoid this. This paper summarises the results of a theoretical and experimental research programme investigating the influence of blast furnace slag on chloride-related transport properties. The relationship between the apparent chloride diffusion coefficient, electrical resistivity and compressive strength was measured. Chloride, hydroxide, sodium and potassium’s intrinsic diffusion coefficients were obtained by using a computational model and an electrical migration test. The initial hydroxide composition of the pore solution, porosity and chloride binding capacity were also determined from the model. The results showed that blast furnace slag improved chloride penetration resistance, resulting in concrete which was less vulnerable to corrosion.

Keywords : concrete; diffusion; chloride migration; chloride.

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