Ensaio de migração de cloretos para concreto: Influência do número de fatias extraídas

Abstract

Chloride migration tests are used to measure the capacity of the concrete to inhibit chloride attack. Many researchers carry through this test in a slice of concrete extracted from the central part of cylindrical specimens, discarding about 75% of the concrete used to mold the specimens. This fact generated the question: would it be possible to extract more slices from a same specimen without losing the confidence in the results? The main purpose of this work is to answer to this question. Moreover, another aim of this study was to show the difference of chloride penetration between finished faces and the formwork surfaces of concrete beams and slabs. The results indicated that it is possible to use more slices of a single specimen for a chloride migration test. Moreover, it was demonstrated that significant difference of chloride penetration exists between the finished surface and the formwork surface of the specimens.