Soil Stabilization Troubleshooting Procedure

Uneven Distribution of Dry Modifying/Stabilizing Agent

• Apply dry agents with calibrated bulk spreader
• Ensure dry agent is evenly spread across width of spreading equipment
• Check for plugged valves/vanes on bulk spreader

Subgrade stays spongy and/or will not densify

• Reestablish control strip and/or density rolling pattern
• If steel wheel rollers are sealing the surface and causing moisture retention, use a heavy pneumatic tire roller or padfoot roller for the breakdown and compaction rolling
• If excess moisture is in the mix, revise modifying/stabilizing agent and water as necessary
• Check for deep subgrade instability

Areas of raveling, scuffing or tearing

• Sweep and monitor. 
• Maintain better traffic restrictions in areas that are not cured.
• Determine if fog sealing or re-fog sealing is necessary to protect.
• Repair deep damaged areas with modified/stabilized material prior to application of pavement structure.

Permanent deformation within wheel path areas due to secondary compaction by traffic

• Keep traffic off treated material until sufficiently cured.
• After initial cure limit traffic to light vehicles
• Use motor grader to smooth surface
• Regrade prior to application of pavement structure

Permanent deformation and shoving due to unstable mix

• Investigate structure in conjunction with mix design lab. Depending on investigation, add additional modifying/stabilizing agent and rework existing areas. Remove and replace affected materials.