SP column cracks can have severe consequences, including:

Understanding the real-world catalyst behind a column crack determines how it is input into modeling software and how it is repaired.

These generally run parallel to the main reinforcement bars. They are frequently caused by corrosion of the rebar (carbonation or chloride attack) or excessive axial loading (too much weight from above).

Engineers often use "tell-tale" gauges to see if a crack is widening over months.

Cracks in reinforced columns generally stem from four main areas:

| Method | Detects | | :--- | :--- | | | Crack depth, internal voids, degraded concrete. | | Half-cell potential | Corrosion activity at strand level. | | Acoustic emission | Active cracking under load (during proof test). | | Ground Penetrating Radar (GPR) | Strand position, voids around ducts (if grouted). |