Chloride accelerated test: influence of silica fume, water/binder ratio and concrete cover thickness

• Main Authors: E. Pereira, A. Resende, M. H. F. de Medeiros, L. C. Meneghetti
• Format: Article
• Language: English
• Published: Instituto Brasileiro do Concreto (IBRACON)
• Series: Revista IBRACON de Estruturas e Materiais
• Subjects: corrosion; CAIM; silica fume, water; concrete cover thickness
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952013000400004&lng=en&tlng=en

In developed countries like the UK, France, Italy and Germany, it is estimated that spending on maintenance and repair is practically the same as investment in new constructions. Therefore, this paper aims to study different ways of interfering in the corrosion kinetic using an accelerated corrosion test - CAIM, that simulates the chloride attack. The three variables are: concrete cover thickness, use of silica fume and the water/binder ratio. It was found, by analysis of variance of the weight loss of the steel bars and chloride content in the concrete cover thickness, there is significant influence of the three variables. Also, the results indicate that the addition of silica fume is the path to improve the corrosion protection of low water/binder ratio concretes (like 0.4) and elevation of the concrete cover thickness is the most effective solution to increase protection of high water/binder ratio concrete (above 0.5).