Plastic Pipes Conference Association # 2023 Lake Buena Vista
Kevin White, Shad Sargand
Re-rounding is a technique for remediating excess deflection in corrugated highdensity polyethylene (HDPE) pipe meeting AASHTO M-294 with diameters between 12" and 60" using a pneumatic device vibrating from within the pipe and pushing against the inside crown and inverted to redistribute the surrounding backfill and restore the original pipe shape. The process has not been evaluated on corrugated HDPE pipe outside of a few reports, and the method is routinely used by contractors to remediate deflected corrugated HDPE pipes. The researchers were contracted by the Ohio Department of Transportation to evaluate the technology as a low cost, less disruptive alternative to removal and reinstallation of deflected pipes. Three 36-inch corrugated HDPE pipes were installed in a well-graded crushed stone aggregate, sand, or AASHTO #57 open-graded aggregate (ODOT Structural Backfill, Type 1, 2, and 3, respectively), and two 18-inch pipes were installed in Type 2 and 3 Structural Backfill. Pipes were intentionally installed using substandard installation techniques to elicit substantial deflection (10% or more) and then re-rounded. The pipe conditions before and after re-rounding were measured and monitored by collecting profiles, measuring vertical deflections, monitoring soil pressures and soil accelerations, backfill characteristics, and depth of pipe corrugations.
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