Structural fill is typically a screened earthen material used to create a strong, stable base. For example, the native soil at a site may be too weak to support a structure, so the native soil is replaced by compacted structural fill to provide the needed bearing capacity. Another common application is the filling of trenches and other excavations that will support roadways or other structures when completed. Structural fills are constructed by compacting earthen materials in place, so the compaction properties (optimum water content and maximum dry density)

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