Case Histories on The Applications of Colloidal Silica for Permeation Grouting-Video

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Video Summary

The presentation reviews colloidal silica for low-pressure permeation grouting, distinguishing it from water glass and fracture or compaction grouting. Its low viscosity enables soil penetration with limited pressure, while adjustable gel times, relatively low pH, and stable behavior support its use. Laboratory tests found that strength increases with solid content and curing time, and permeability can fall to around 10⁻⁸ m/s. Case histories from Italy, Portugal, and the UK showed reduced settlement, successful excavation support, and sustained low permeability. Comparisons also suggested colloidal silica can achieve a larger treatment radius than water glass, potentially reducing project time and overall costs.

Keywords

colloidal silica

low-pressure permeation grouting

soil stabilization

permeability reduction

ground improvement