Using Foamed Asphalt as a Stabilizing Agent in Full Depth Reclamation of Route 8 in Belgrade: Final Report [March 2009]
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2009-03-01
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Abstract:Maine has a variety of soil types throughout the state. A majority of these soil types degrade rapidly and
have poor stability. To eliminate the cost of supplying quality road base material from a distant source and
increase the stability of existing soils, the Maine Department of Transportation (MaineDOT) has been
requiring contractors to rehabilitate roads using the Full Depth Reclamation process.
Full Depth Reclamation involves milling the existing bituminous pavement plus a portion of the unbound
base material. The milled material is then graded and compacted. Traffic can use the roadway until a
bituminous base and wearing surface is applied.
In addition to using Full Depth Reclaimed material, MaineDOT has been experimenting with adding a
number of stabilizing agents to virgin or recycled base materials to increase stability. Stabilizing agents
utilized include cement, emulsion and calcium chloride.
Foamed Asphalt is another stabilizing agent. This is a mixture of air, water and hot asphalt. Cold water is
introduced to hot asphalt causing the asphalt to foam and expand by more than 10 times its original
volume. During this foaming action the asphalt has a reduced viscosity making it much easier to mix with
aggregates. A specialized piece of equipment mills the existing bituminous pavement and base material
and introduces Foamed Asphalt all in one process. The material is then shaped to grade and compacted.
Traffic can operate on the stabilized base until a hot mix asphalt base and wearing surface is applied. This
paper evaluates the performance of a Foamed Asphalt project over a five year period
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