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Time-dependent deflection of thermoplastic pipe under deep burial Sargand, Shad M et al

By: Sargand, Shad MPublication details: Transportation Research Record, 2001Description: nr 1770, s. 236-42Subject(s): USA | Pipe | Thermoplastic | In situ | Soil | Pressure | Deflection | | Time | Development | Construction | Long term | Movement | Sensor | Horizontal | Vertical | 37Bibl.nr: VTI P8167:1770Location: Abstract: Field performance data are presented on the time-dependent deflection of thermoplastic pipes tested at the Ohio Research Institute for Transportation and the Environment (ORITE) at Ohio University in Athens, Ohio. In fall 1999, ORITE began its study of 18 thermoplastic pipe products--12 HDPE (high density polyethylene) and 6 PVC (polyvinylchloride)--ranging in diameter from 762 to 1524 mm and buried under either 6.1 m or 12.2 m of embankment fill. The installation conditions for these pipes were varied to study the effects of bedding thickness, backfill material type, and relative compaction on their structural performance. The pipes have been extensively monitored using a comprehensive set of sensors. Until this point, insufficient field data have been available for the development of design standards for thermoplastic pipes since previous tests were conducted over a short time period. Long-term tests are more reliable for calculating field performance since the structural response of plastic pipe is time dependent. The focus of the study described was the deflection performance of six of the thermoplastic pipes during burial and over the long term under actual field conditions. The six different thermoplastic pipes were located under 12.2 m of cover using either Ohio Department of Transportation (ODOT) 304 crushed limestone or ODOT 310 river sand materials for backfill. Each pipe was instrumented with displacement potentiometers measuring deflection in the vertical and horizontal directions as well as the circumferential shortening. The results from the study indicate that the deflections stabilized within 2 months from the completion of construction.
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Field performance data are presented on the time-dependent deflection of thermoplastic pipes tested at the Ohio Research Institute for Transportation and the Environment (ORITE) at Ohio University in Athens, Ohio. In fall 1999, ORITE began its study of 18 thermoplastic pipe products--12 HDPE (high density polyethylene) and 6 PVC (polyvinylchloride)--ranging in diameter from 762 to 1524 mm and buried under either 6.1 m or 12.2 m of embankment fill. The installation conditions for these pipes were varied to study the effects of bedding thickness, backfill material type, and relative compaction on their structural performance. The pipes have been extensively monitored using a comprehensive set of sensors. Until this point, insufficient field data have been available for the development of design standards for thermoplastic pipes since previous tests were conducted over a short time period. Long-term tests are more reliable for calculating field performance since the structural response of plastic pipe is time dependent. The focus of the study described was the deflection performance of six of the thermoplastic pipes during burial and over the long term under actual field conditions. The six different thermoplastic pipes were located under 12.2 m of cover using either Ohio Department of Transportation (ODOT) 304 crushed limestone or ODOT 310 river sand materials for backfill. Each pipe was instrumented with displacement potentiometers measuring deflection in the vertical and horizontal directions as well as the circumferential shortening. The results from the study indicate that the deflections stabilized within 2 months from the completion of construction.

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