Permeation Grouting using Polyurethane and Acrylate Resins in a Silty SAND (SM); Injection Methods, In-situ Verification Testing Methods and Laboratory Results.-Video

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Video Summary

A large-scale field trial in Vancouver evaluated polyurethane and acrylate permeation grouting in compacted silty sand. Researchers monitored grout take, injection pressures and flow rates, and tested treated soil using dynamic cone penetration and laboratory strength tests. Polyurethane injections treated roughly five times their grout volume, with some soil fracturing even at low pressures. The treated soil showed more than double the penetration resistance, higher estimated bearing capacity, and increased strength in laboratory tests. Raising polyurethane injection pressure produced little additional flow and risked further fracturing. By contrast, low-viscosity acrylate flowed through the soil with little pressure increase and helped stabilize a cut more than four feet high, but its test results were anomalous and require further study. Overall, laboratory results broadly confirmed the in-situ findings. The team concluded that careful pressure and flow control is essential, and that dynamic cone penetration testing may provide a useful on-site quality-control method.

Keywords

permeation grouting

polyurethane grout

acrylate grout

dynamic cone penetration

soil stabilization