Abstract

FREITAS, M. S.  and  MEIRA, G. R.. Transport capacity of chloride ions in concretes with mineral additions used in Brazil. Rev. ALCONPAT [online]. 2023, vol.13, n.1, pp.61-79.  Epub Apr 26, 2024. ISSN 2007-6835.  https://doi.org/10.21041/ra.v13i1.603.

The objective of this work is to study the chloride ions transport capacity in concretes with additions of metakaolin and fly ash. For this purpose, tests of surface electrical resistivity and chloride ion diffusion (NT Build 443) were performed. As a result, it was observed that the use of the adopted additions was efficient to delay the ingress of chloride ions, reducing the diffusion coefficient of chlorides - Dns and increasing in surface electrical resistivity - ρ in the studied materials. The general relationship between Dns and ρ for the studied concretes can be expressed by Dns = 2,7E-7* ${\mathit{\rho }}^{-\mathrm{0,475}}$ and the relationship between chlorides accumulated into concrete and surface electrical resistivity can be expressed by Cl acum = 4,09-0,20945𝜌.

Keywords : concrete; chlorides; additions; diffusion; resistivity.

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