Anti-Corrosion Strategies for Tunnel Track Shoulders

Tunnel environments present unique corrosion challenges for railway track shoulders due to high humidity, limited ventilation, and exposure to contaminants (e.g., de-icing salts, coal dust, or exhaust fumes). Without proper protection, steel and concrete components degrade rapidly, compromising structural integrity.

Anti-Corrosion Design Solutions
Material Selection
Component Corrosion-Resistant Alternatives Advantages
Concrete Sulfate-resistant cement + 30% fly ash Reduces permeability & chemical attack
Reinforcement Epoxy-coated rebar / Stainless steel (316L) Blocks chloride penetration
Fasteners Hot-dip galvanized or titanium alloys Withstands abrasive wear
Protective Coatings
Concrete Sealers:
Silane-based penetrating sealers (10+ year service life).
Polyurethane topcoats for high-abrasion zones.
Metallic Coatings:
Thermal-sprayed aluminum (TSA) for steel components.

Drainage & Ventilation
Sloped Shoulders (2–5%): Prevent water pooling.
Side Channels: Collect and divert runoff to sump pumps.
Forced Air Systems: Reduce humidity in critical sections.