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Projects >City of Dallas Rehabs Failed Pavements with FDR
City of Dallas uses FDR to Save Dollars and Create
a Sustainable Environment
 Recognized
as a cost-effective method to rehabilitate failed flexible pavements,
full-depth reclamation (FDR) with portland cement provides an extremely
durable material in a sustainable manner. Its benefits convinced
the City of Dallas to embrace the use of FDR in the restoration
of many badly deteriorated streets.
In 2004, the City made a commitment to become a “greener”
Dallas and developed a sustainability policy aimed at creating an
environmentally friendly city. One of the many environmental issues
it faced was waste management and in particular, the disposal of
materials created from road repairs.
 The
plan also looked at ways to reduce fuel emissions in the area. FDR
with portland cement helped the City address both issues by reducing
road construction debris that needed to be sent to a landfill, and
the truck emissions needed to haul the waste to landfill.
The Asphalt Recycling and Reclaiming Association (ARRA) defines
FDR as a: “…technique in which the full flexible pavement
section and a predetermined portion of the underlying materials
are uniformly crushed, pulverized, or blended, resulting in a stabilized
base course… full depth reclamation is able to correct delinquent
cross sections, increase the load-bearing strength of the base,
and utilize 100% of the existing materials. Substantial savings
can be realized while meeting environmental goals.” When using
portland cement, an extremely durable base is created while maintaining
the cost effectiveness of the FDR process.
 FDR’s
benefits are clearly illustrated by The City of Dallas applications.
Through the use of FDR, the city estimates it is recycling an average
of 80% of its existing street materials and saving 40% per mile
of roadway work. This is being achieved while reducing the landfilling
of road repair debris – a major of goal of the City. With
the cost savings, the City of Dallas is able to restore three times
the amount of roadway with the same budget.
FDR restoration is also benefiting the Dallas commuters. “We
were able to get our streets back to the driving public faster than
we’ve done in the past,” said Gilbert Aguilar, assistant
director of the Department of Streets and Sewers, City of Dallas.
The FDR process reduced the time needed for road construction from
33 days per mile using traditional methods to 10 days per mile.
This in turn reduced vehicle emissions resulting from delays and
consequently engine idle time.
 The
City of Dallas generally restores at least 50 centerline road miles
with FDR with portland cement every year. Cement slurry is the application
method of choice and depths of the slurry incorporation range from
6 inches to 12 inches depending on the site-specific material. Portland
cement content by dry weight for the depths is generally 35 to 40
lbs per square yard. With this portland cement content, an unconfined
compressive strength of 250 to 400 psi is expected. The City has
also been experimenting with application of the cement slurry via
a spray bar that injects the slurry into the mixing chamber of the
pulverization equipment.
FDR with cement makes an important contribution to the City of Dallas’s
sustainable development plan. With its durability and lower life-cycle
costs, the area will reap its benefits for years to come.
Read more about how FDR provides a tremendous reduction in wasted
material in Full-depth
Reclamation: Recycling Roads Savems Money and Natural Resources
(SR995)
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