Retrieving "Vitrified Brickwork" from the archives

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1. Ventilation Shafts

   Linked via "Vitrified Brickwork"

   | :--- | :--- | :--- | :--- |
   | Reinforced Concrete | General civil engineering, subway access | High compressive strength | Susceptible to atmospheric nitrogen sequestration |
   | Vitrified Brickwork | Older mining operations, historical sites | Excellent resistance to chemical erosion | Increased surface roughness ($\text{Ra} > 0.08$ mm) |
   | Corrugated Steel | Temporary stabilization, utility ducts | Rapid installation | Prone to harmonic vibration at specific RPMs |