The Wisconsin Department of Transportation (WisDOT) spends approximately 10 percent of
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its improvement project budget on embankment construction each year. A critical aspect of
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embankment construction is stability. It is needed to provide an acceptable foundation for
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pavement construction and will contribute to the long-term performance of the pavement structure.
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To achieve this, WisDOT developed specifications for embankment density and has developed
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specifications to limit the thickness of embankment lifts placed during construction. The current
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specifications limit lift thickness to 0.20 meters (8 inches) for most soil conditions. However, if granular
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soils are used and density measurements are being made, a 0.30-meter (12-inch) lift thickness may be
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allowed. The 8-inch lift limit is by far the most common application on departmental projects. The
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0.20-meter (8-inch) lift limit has been the standard for WisDOT construction for many years. This limit
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was based on practical field experience with contractor methods and equipment. It has been accepted as
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a reasonable soil thickness that would contribute to adequate embankment compaction without excessive
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testing and inspection by WisDOT staff.
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