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Is it less expensive to rehabilitate an entire
roadway through FDR using cement rather than removing and replacing
the roadway?
Full-depth reclamation (FDR) recycles the materials from deteriorated
asphalt pavement, and, with the addition of cement, creates a new
stabilized base. Another alternative, the complete removal and replacement
of the existing base and asphalt surface, can be very expensive
and wasteful of virgin aggregates. The recycled base will be stronger,
more uniform, and more moisture resistant than the original base,
resulting in a long, low-maintenance life. And most important, recycling
costs are normally 25% to 50% less than removal and replacement
of the old pavement.
Here are some cost-saving examples from across the country of actual
projects:
| Westminster, California (1999) |
| FDR using 6% cement with asphalt overlay 1999 |
$10.98 / sy |
| Removal / replacement w/aggregate and asphalt overlay |
$21.78 / sy |
Cost savings = 50% |
| Spokane County, Washington (1999) |
| FDR using 5% cement with a chip seal overlay |
$91,000 / mi |
| Removal / replacement w/aggregate and a chip seal overlay |
$135,000 / mi |
Cost savings = 33% |
| Long County, Georgia (2004) |
| FDR using 7% cement with asphalt overlay |
$127,000 / mi |
| Removal / replacement with aggregate and asphalt overlay |
$218,000 / mi |
Cost savings = 42% |
| Hudson, Ohio (2004) |
| FDR using 10% cement |
$12.94 / sy |
| Removal / replacement with aggregate |
$22.66 / sy |
Cost savings = 43% |
As you can see, FDR with cement makes the reconstruction of old
roads a largely self-sustaining process. The original “investment”
in virgin road materials becomes a one-time cost, which is reclaimed
through cement stabilization and the addition of a new, thin surface
course.
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