Curtain Grouting in Hard Crystalline Rock Using Ultra-Low Viscosity Polyurethane Resin-Video

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Video Summary

A Swedish wastewater treatment plant’s underground sludge digester suffered significant groundwater ingress and leakage when filled. To seal it, engineers conducted permeability tests and installed curtain grouting around and inside the structure, using polyurethane resin. The standard resin did not penetrate the fine rock fissures effectively, so a lower-viscosity formulation was developed and applied. Grouting reduced leakage from 42 cubic metres per day to 2 cubic metres per day. The improvement was sufficient for the client to cancel plans for an additional concrete lining.

Keywords

wastewater treatment

sludge digester

groundwater ingress

curtain grouting

polyurethane resin