Corrosion behavior of reinforcement in concrete with different compositions

Abstract

Investigation of corrosion behaviour of reinforcement in several concrete compositions with different cement types, supplementary cementitious materials (SCMs) and special admixtures, was conducted. The corrosion behaviour of the reinforcement was evaluated based on the half-cell potential, corrosion current density, electrical conductivity tomography and reinforcement cross-sectional loss. The results showed that concrete with SCMs had the highest corrosion resistance, followed by concretes with different cement types and concretes with special admixtures, respectively. For the different cement types, the corrosion resistance of high-early strength cement concrete was the highest, followed by ordinary Portland cement concrete and sulphate-resistant cement concrete, respectively. Regarding the SCMs, the corrosion resistance of silica fume concrete was the highest, followed by fly ash concrete and blast furnace slag concrete, respectively. Regarding the special admixtures, the corrosion resistance of hybrid OPC-geopolymer concrete was the highest, followed by expansive concrete and glass fiber reinforced concrete, respectively.

Keywords:

• Cement type
• supplementary cementitious materials (SCMs)
• special concrete
• corrosion
• electrical resistivity tomography