Addressing Unstable Soil (Pumping Ground)
At 17:58 in
The Invisible Work: Prepping a Massive Patio Foundation - GLASS HOUSE EP 4
What happens here
One area of concern is a section of unstable, 'pumping ground' (muddy, saturated soil) where a trench was dug. To resolve this, the soil will be amended with Type S mortar mix. Spread the dry mortar mix over the affected soil in the trench. Then, use shovels or rakes to mix the mortar into the soil. For additional stabilization, drive larger, angular aggregate (such as broken concrete pieces or large gravel) into the sub-grade using the plate compactor. This multi-layered approach will chemically alter the soil's composition to improve drainage, and mechanically interlock with the aggregate to create a firmer, more stable base, preventing future settling or heaving of the hardscape.
Goal: Stabilize areas of 'pumping ground' to prevent future hardscape issues.
Tools and materials
- Dust Mask — Protecting respiratory system from mortar dust
- Plate Compactor Bartell SP-13H — Compacting the soil and driving in aggregate
- Safety Gloves — Protecting hands from mortar and rough aggregate
- Shovels — Mixing mortar into the soil and spreading aggregate
- Large Aggregate — Providing mechanical stability to amended soil
- Type S Mortar Mix Amerimix — Amending and stabilizing unstable soil
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