Analysis of the Specimen's Dimensions Variation Influence in Self -Compacting Concrete Bulk Electrical Resistivity

Abstract

The electrical resistivity is an important concrete property because it is directly related to the chloride ions penetration that cause the depassivation of the reinforcement, being a corrosion-causing agent. In Brazil, the bulk electrical resistivity test is described by ABNT NBR 9204/2012 (ABNT, 2012) which defines the specimen dimensions as Ø 150 x 150mm and the use of liquid mercury electrodes. Several studies of electrical resistivity are found using varying dimensions of specimens. This article aimed to analyze whether the variation in the specimen dimensions has a significant influence on the bulk electrical resistivity results of the same self-compacting concrete mixture. Three specimens were used for each geometry, Ø 50x100mm, Ø 100x100mm, Ø 100x200mm and Ø 150x150mm. Electrical resistivity was assessed at 28 and 90 days and statistical analysis was performed using the ANOVA program.