Influence of silica fume addition on concretes physical properties and on corrosion behaviour of reinforcement bars

The addition of silica fume (SF) in concretes has been proposed as a form to improve their performance in resisting concrete reinforcement corrosion. In this study an experimental program on compressive strength, porosity, electrical resistivity and polarization curves was carried out with the purpose of evaluating the effect of different SF additions (0%, 6% and 12%). Concretes with different water–binder ratio (cement + SF) 0.50, 0.65 and 0.80 were used. The results have allowed to show that there are significant improvements of the concrete properties with the SF addition, suggesting its use in aggressive environments.