Prior to 1989, highway edge drains were backfilled with the existing trench material and dynamically compacted with a tamping shoe. The net result was damage to the inner core of the edge drain.
In response to these problems the installation specification was revised in 1989 to insure the integrity of the drainage system. The revised method of installation consisted of moving the panel to the shoulder side of the trench and then flushing a sand slurry into the trench for backfill. Flushing the sand eliminates the need for mechanical compaction.
Since 1989, two projects have been completed using the revised special note for installation and another is currently under construction. This report discusses the performance of these installations.
Digital Object Identifier
Fleckenstein, L. John and Allen, David L., "Evaluation of Geocomposite Pavement Panel Drains Installed in a Sand Backfill Under Revised Installation Specification" (1990). Kentucky Transportation Center Research Report. 487.