TRI Experience: TRI personnel have been involved with polyethylene geosynthetics, including liners and pipe for over 20 years. Involvement with recycled PE occurred when we were awarded a project sponsored by the American Association of State Highway Transportation Officials (AASHTO) and funded through the National Cooperative Highway Research Program (NCHRP) under project 04-32:
Performance and Quality Control of Corrugated Pipe Manufactured with Recycled Polyethylene Content
The purpose of this project is to determine if recycled polyethylene can be added to corrugated drainage pipe and maintain adequate long-term performance. Initially, 23 different recycled PE samples were obtained and characterize to understand what was available on the recycled market. Then, more than 60 separate blends of virgin and recycled PE were prepared and selected properties evaluated. This resulted in an understanding of the relationships between recycled quality and quantity and the resulting blend properties. The project is in the final stages where corrugated pipe has been prepared from 15 trial formulations and long-term testing underway.
Determined presence of recycled in a product sold as 100% virgin PE to a municipal engineer.
Assisted a drainage tile manufacturer to eliminate cold cracking by re-formulating their blends containing recycled to improve stress crack resistance.
Helped a manufacturer incorporate recycled resin with high LDPE homopolymer content into his product.