Active Zone
The region of soil near the top where the water content consistently varies because of precipitation. Soil movement, shrinking and swelling, is most common in this layer.
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Aggregate
A mixture of sand, rock, and crushed stone that improves the structural performance of concrete.
Anchor Pier
A pier that is connected to a structure to provide support and lift.
Apron
A concrete slab that is often at an entrance (to driveways/properties) for vehicles.