- Water Inflow
- Joint Damage
- Scaling and spalling at the surface
- Deformations (side walls, crown) / Invert heave up
- Surface deposits and discoloration
- Cavities behind lining
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- Accumulation of water in invert
- Cracking
- Exposed reinforcement / Corroded reinforcement
- Weathered surfaces
- Honeycombing
- Deposits in drainage system, drain clogging
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