Retrofit Transverse Pavement Drainage System

摘要

The report covers the design, installation, and performance of a transverse pavement drainage system manufactured by Pavement Drainage Systems. This retrofit system utilizes a hydraulic probe to insert subbase drains underneath a concrete pavement. The transverse drains consist of a slotted PVC pipe wrapped in a seamless geotextile fabric. Performance of these drains would be most effective in pavement sections with excessive subsurface moisture, poor drainage characteristics, and a longitudinal gradient greater than the transverse cross slope. Since no excavation of any drain was performed and no subbase samples were analyzed for permeability, the exact cause of failure of the transverse drains is not known. Failure may be due to, but not necessarily limited to, any one or a combination of the following factors: Impermeability of the subbase; Product design which would permit geotextile blinding or sediment accumulation in the drain pipe; Insufficient cross slope of the installed drains; Subbase compaction and/or smear during installation.