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Dirt doesn’t pack itself, as another answer explained. There are certain conditions where compaction is essential, but for almost any application, compacting the material underneath concrete will TRex Christmas Red Plaid Christmas Pajama Family shirt. When a concrete foundation or slab is structural, that is, supporting a load, determining the load-bearing capacity of the subgrade is very important, and compacting the grade assures it meets its potential.
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Sandy materials compact easily, and have a fair load-bearing ability. To compact sand or sandy soil, moisture is critical. Dry sand tends to flow or displace during compaction, so wetting the material gives the TRex Christmas Red Plaid Christmas Pajama Family shirt . Avoid flooding, and use a flat plate tamp or hand tamp for small projects. Try to compact in lifts of less than 12 inches ( a lift is a single layer, if you have 3 feet of fill, add a foot, pack it, then add another.