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Long Term Performance of Corrugated HDPE Pipes Produced with Post-Consumer Recycled Materials Under Constant Deflection

Shaheen, Ehab T.
http://orcid.org/0000-0002-1719-154X
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1541422245636659

Abstract Details

2018, Doctor of Philosophy (PhD), Ohio University, Civil Engineering (Engineering and Technology).
In recent years, the incorporation of recycled material in the production of plastic pipes has gradually increased. With this new development, the federal government were considering the possibilities of allowing corrugated high-density polyethylene (HDPE) pipes manufactured with post-consumer recycled (PCR) materials installed as culverts under major highways, despite the fact that they may contain impurities and their long-term behavior is still not fully understood. This dissertation was part of the NCHRP Report 870 (Pluimer, 2018), which led to a new revision in AASHTO M-294. This new revision allows HDPE pipes to be manufactured with either virgin or recycled materials. This dissertation presents a test program recently completed at Ohio University, in which corrugated HDPE pipes with varied post-consumer recycled (PCR) material contents were subjected to a forced long-term constant vertical deflection of 20%. Eight HDPE pipe specimens having inside diameter of either 610 mm (24 in) or 762 mm (30 in) were kept in a compressed state in the laboratory for two years. The maximum tensile strain was found to be about 3% for all the pipes. No cracks were seen in the 0% PCR and the 49% PCR pipes during the 2-year duration. However, the 98% PCR pipe developed longitudinal cracks at the crown position inside after 101 days and additional longitudinal cracks at the springline position outside after 131 days. To predict the long-term behavior of HDPE drainage pipes, coupon specimens with 0%, 49%, and 98% post-consumer recycled (PCR) materials were loaded incrementally in tension according to the stepped isostress method (SSM) to establish their master creep curves. A reference stress of 15% ultimate tensile strength was used with a dwell time of 24 hours. The 0% and 49% PCR specimens elongated by more than 600%, whereas the 98% PCR specimen elongated little and ruptured within a few minutes after adding the final load. The trend of the SSM’s shift factors in terms of creep stress agreed with the Eyring equation for all the coupons. From the rupture time results, it was shown that as the percentage of recycled material increase, the coupon would rupture in less time. The creep master curves for each of the pipes obtained from the creep tests were converted to relaxation curves using an interconversion method. The maximum percentage of recycled material allowed in HDPE is interpolated to be 57% and 39% for 50-year and 75-year service life spans. A three-dimensional finite element analysis (FEA) of 30-in HDPE pipes with different percentage of recycled material contents were performed using the program `Abaqus’. In the analysis, prony series material properties extracted from the relaxation curves were used for each PCR content HDPE pipe. These pipes were subjected to a forced long-term deflection of 20%. The force needed to keep the pipes continuously deflected was calculated in the analysis using the program. The results were compared with the results of the experimental work conducted at Ohio University. The FEA models showed a good correlation with the experimental results. According to the FEA results, the long-term maximum strain in the pipes were about 3.75% and the long term maximum stresses were located at the crown.
Teruhisa Masada (Advisor)
Shad Sargand (Committee Member)
Issam Khoury (Committee Member)
Sergio Lopez-Permouth (Committee Member)
Xiong Yu (Committee Member)
165 p.
Civil Engineering; Geotechnology
HDPE pipes; Viscoelastic; long term performance; laboratory tests; postconsumer recycled material; constant deflection test, stress relaxation; tensile strength; Creep test; HDPE coupons; Strain measurements; Creep master curve; Finite element analysis

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Citations

  • Shaheen, E. T. (2018). Long Term Performance of Corrugated HDPE Pipes Produced with Post-Consumer Recycled Materials Under Constant Deflection [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1541422245636659

    APA Style (7th edition)

  • Shaheen, Ehab. Long Term Performance of Corrugated HDPE Pipes Produced with Post-Consumer Recycled Materials Under Constant Deflection. 2018. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1541422245636659.

    MLA Style (8th edition)

  • Shaheen, Ehab. "Long Term Performance of Corrugated HDPE Pipes Produced with Post-Consumer Recycled Materials Under Constant Deflection." Doctoral dissertation, Ohio University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1541422245636659

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Ohio University and OhioLINK.
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