Tunnels
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Tunnels ✩
Application Note
Introduction
The Problem
Tunnels are exposed to challenging environmental conditions, including water infiltration, chloride exposure, and vibrations from traffic, which can lead to corrosion of embedded steel, concrete deterioration, and structural weakening. These factors create safety hazards and drive up maintenance costs. To ensure the long-term durability of tunnel infrastructure, it is essential to implement solutions that address corrosion, water ingress, and structural deficiencies, including crack repairs and exposed rebar.
Tunnel Challenges
Corrosion of Reinforcement: Corrosion of embedded steel in tunnel concrete leads to spalling, structural weakness, and safety risks, requiring frequent inspections and costly emergency repairs.
Water Leakage: Water ingress through cracks and pores in the concrete causes mold growth, slippery surfaces, electrical hazards, and increased maintenance costs for cleaning and repairs.
Structural Weakness: Load stress, vibrations, thermal cycling, and environmental factors weaken the concrete matrix over time, compromising the overall strength of the tunnel.
Frequent, Short-Lived Repairs: Poor adhesion between new and existing concrete layers can result in weak joints, which can crack or disintegrate under stress.
Mitigation Strategy
Surtreat’s tunnel protection strategy is designed to address these specific challenges through corrosion inhibition, concrete strengthening, crack repair, and water repellency. The recommended approach includes:
Corrosion Inhibition: Applying treatments to prevent corrosion in steel reinforcement and treat areas of exposed rebar.
Concrete Strengthening and Crack Repair: Strengthening the concrete matrix, repairing cracks, and restoring areas where rebar is exposed.
Water Repellency: Sealing concrete surfaces to prevent future water ingress.