| Title |
RETROFIT TRANSVERSE PAVEMENT DRAINAGE SYSTEM. FINAL REPORT
|
| Accession No |
00616502 |
| Authors |
Beam, J L; Sheftick, D E; Highlands, K L |
| Period Covered |
8709-9007 |
Corp. Authors
/ Publisher |
Pennsylvania Department of Transportation  ; Federal Highway Administration
|
| Publication Date |
19910600 |
| Description |
33 p.;
Appendices(2); Figures(2); Photos(7); References(4); Tables(4) |
| Abstract |
This 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. Approximately 3,000 L.F. of transverse drains were installed on SR 80 in Monroe County in September, 1987. These drains were installed directly beneath the transverse joints and were outletted either into adjacent swale areas or into existing longitudinal pavement base drains. If tunnelling difficulties were encountered, the drains were either offset one foot downslope from the transverse joint or not installed. During a July, 1990 field evaluation, none of the transverse drains which were outletted into swale areas were observed to be flowing water even though saturation of the subbase material likely existed at this time. Approximately 20% of these drains were partially filled with sediment which is an indication that they had previously functioned. Since no excavation of any drain was performed and no subbase samples were analyzed for permeability, the exact cause of failure of the transerse 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; and subbase compaction and/or smear during installation. |
| TRT Terms |
Building ; Design ; Drains ; Facilities ; Failure ; Geotextiles ; Installation ; Performance ; Pipe ; Polyvinyl chloride ; Retrofitting ; Subbase (Pavements) |
| Other Terms |
Installing; Slotted pipes; Subbase; Transverse drains |
| Subject Areas |
H63 MECHANICS (EARTH MASS); I42 Soil Mechanics |
| Report Number |
FHWA-PA-89-043+86-54; Res Proj 86-54 |
| Availability |
National Technical Information Service |
| TRIS Files |
HRIS |
| Database |
TRIS Online |
TRT
