"Concrete Cancer"
Corrosion of steel reinforcement in concrete structures is
well known to be "Concrete Cancer", which is a significant worldwide
problem and causes multi-billion dollars losses to the infrastructure and
building owners each year.
India loses around Rs.25,000 Crores every year on account of corrosion.
The detection, diagnosing and appropriate treatment of this
complicated problem requires very special expertise in this field.
Stage 1: Initially, the concrete appears to be sound with
relatively little macroscopic cracking and no reddish discoloration from
corrosion product formation.
Stage 2: Macroscopic cracks have appeared and the concrete
surface is stained by reddish corrosion products.
Stage 3: Spalling of the
concrete cover over the reinforcing steel is clearly visible, due to the
formation of voluminous corrosion products
Stage 4: Severe spalling of the concrete cover over the
reinforcing steel is evident, leaving the reinforcing steel bars directly
exposed to the atmosphere.
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