United States Department of Transportation
i
Evaluate the use of reclaimed concrete aggregate in french drain applications : [summary].
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2014-02-01
[PDF-824.62 KB]
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Abstract:Recycled concrete aggregate (RCA) is often used
as a replacement of virgin aggregate in road
foundations (base course), embankments, hot-mix
asphalt, and Portland cement concrete. However,
the use of RCA in exfiltration drainage systems,
such as French drains, is currently prohibited in
many states in the U.S. The French drain system
collects water runoff from the road pavement
and transfers it to slotted pipes underground
and then filters it through coarse aggregate and
geotextile filter fabric. The Florida Department
of Transportation (FDOT) requires No. 4 size
aggregate for French drain applications. The
primary concerns with using RCA as a drainage
medium are the fines content and precipitation of
calcium carbonate, which can reduce filter fabric
permittivity. Additional concerns include the
potential for re-cementation of RCA fines.
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