Rust inside concrete — silent strength loss

Carbonation and chloride attack reach steel in Guwahati coastal-influenced climate. Corrosion can consume 40% of bar strength before visible spalling.

Symptoms

• Rust stains without visible crack
• Cover concrete sounding hollow
• Early spalling on balcony
• Building near Brahmaputra humidity

Diagnosis

Half-cell, cover meter, and chloride sampling. Remaining life estimated before repair scope.

Can corrosion be reversed?

Steel can be treated and re-passivated; lost section needs supplemental reinforcement.