Improving the properties of reclaimed asphalt pavement for roadway base applications [summary].
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2012-01-01
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Abstract:Over 90 percent of
U.S. roads are paved
with asphalt, which
must be periodically
resurfaced. Milling
produces reclaimed
asphalt pavement (RAP),
which can be recycled
in hot-mix asphalt,
but at no more than
25%. Therefore, much
RAP remains for other
roadway applications.
RAP is a well-drained,
granular material available on site; however, 100%
RAP has low bearing strength and creeps under
load.
In this project, Florida Institute of Technology
researchers sought to improve RAP bearing
strength and reduce creep to levels acceptable
for roadway base applications. Several processing
methods and additives were tested. Specimens
were evaluated wet and dry by strength tests,
including limerock bearing ratio (LBR), unconfined
compression, Marshall compression, and indirect
tensile tests. Seven-day, one-dimensional
consolidation tests evaluated creep deformation.
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