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Evaluation of Corrugated HDPE Pipes Manufactured with Recycled Content underneath Railroads

机译：在铁路下使用回收成分制造的HDPE波纹管的评估

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Corrugated high-density polyethylene (HDPE) pipes are an attractive product for culvert and drainage applications in the railroad industry due to their resistance to corrosion and abrasion, long service life, and flexibility. Railroad specifications currently require these pipes to be manufactured with 100% virgin materials. However, due to the push for more sustainable and cost-effective engineering materials and practices, the railroad industry would benefit from using pipes made with recycled content provided their long-term performance was equivalent to pipes made with virgin materials. To evaluate the performance of corrugated HDPE pipes made with recycled content in rail applications, a pilot study was conducted with the Southeastern Pennsylvania Transit Authority (SEPTA). The study was funded cooperatively by SEPTA and the National Cooperative Highway Research Program (NCHRP) Project 4-39. Two 30-inch diameter corrugated HDPE pipes, one manufactured with 100% virgin materials and one manufactured with post-consumer recycled content, were installed underneath a regional commuter rail line in northeast Philadelphia with 2 feet of cover from the top of the pipe to the bottom of the railroad tie. The pipes were instrumented with strain gages and extensometers to record live-load data and monitor the pipes over time. A laboratory study was also developed to assess the long-term durability of pipes made with recycled content with regards to cyclical live loads. The pipes have been in service for over 1 year and are performing as designed, with no change in performance since the date of installation. This was a groundbreaking study as it included the first corrugated HDPE pipe manufactured with post-consumer recycled content installed underneath one of SEPTA's regional commuter lines. The research project is a key component of SEPTA's ongoing sustainability initiatives.
机译：波纹高密度聚乙烯（HDPE）管因其耐腐蚀和耐磨性，长使用寿命和柔韧性而成为铁路工业涵洞和排水应用的诱人产品。目前，铁路规范要求这些管道必须使用100％原始材料制造。但是，由于推动了更具可持续性和成本效益的工程材料和实践的推动，铁路行业将受益于使用回收成分制成的管道，前提是其长期性能与原始材料制成的管道相当。为了评估由再生材料制成的波纹HDPE管道在铁路应用中的性能，与美国宾夕法尼亚州东南交通管理局（SEPTA）进行了一项试点研究。这项研究是由SEPTA和国家公路合作研究计划（NCHRP）项目4-39共同资助的。在费城东北部的一条通勤铁路线下方安装了两根直径30英寸的HDPE波纹管，一根用100％的纯净材料制造，另一根用消费后的可回收材料制造，从管子顶部到顶部的距离为2英尺。铁路领带的底部。用应变计和引伸计对管道进行测量，以记录活荷载数据并随时间监视管道。还开展了一项实验室研究，以评估循环再用负载对循环再利用制成的管道的长期耐用性。这些管道已经使用了一年以上，并且按设计运行，自安装之日起性能未发生变化。这是一项具有开创性的研究，因为它包括在SEPTA的区域通勤线路之一下安装的具有消费后回收成分的第一条HDPE波纹管。该研究项目是SEPTA正在进行的可持续性计划的重要组成部分。

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