No abstract

No abstract

This project assessed enhancements in safety and productivity possible through recently developed construction practices, and identified and evaluated opportunities for cost reduction, improved pipe protection, and decreased construction created pipe/pipe coating damage that could be realized with new or emerging pipe support and padding/backfill practices. Data were gathered subject to the practical constraints imposed by the use of construction equipment and the contractor's permission to enter or approach the ditch for "hands-on" measurements and close-up observation. Coating damage resistance was found to be a major factor in the viability of bedding and padding practices and specifications, as existing coatings were found to be tough and durable and so were resistant to damage under conditions typical of well-controlled bedding and padding operations. Thus, the significance of bedding and padding practices designed to avoid damage was found to be limited where adequately damage-resistant coatings were used. Performance-based specifications for coatings and construction practices appear viable for such scenarios, with validation needed to make this a widely accepted approach. Some areas have been identified for future development, including combination crusher/padding machines and continued evolution of damage-resistant coatings.

No abstract