Corrosion of reinforcing steel bars in concrete
Before being placed in a formwork, steel reinforcement may become rusted, because it was initially exposed to the atmosphere. When freshly-mixed concrete is placed around this steel, the mixing water penetrates through the rust pores, where it gradually forms hydrated calcium ferrite (4.CaO. Fe2 O3 13H2 O). Moreover, this water reacts with steel and forms…