Field Performance of Corrugated Pipe Manufactured with Recycled Polyethylene Content (2018) / Chapter Skim
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71 Based on the research results summarized in Chapter 2, proposals were established for AASHTO material and design standards for pipes manufactured with recycled materials. A new test method, the UCLS test, was developed to assess the stresscrack initiation and propagation properties of HDPE materials containing recycled content.
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72 scale, with log time on the x-axis and log stress on the y-axis. Determine the best-fit curve for the data points, which should be linear on a log-log scale.
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73 If the slope of the curve and one data point are known (or fixed) , one can solve for any other data point on the curve.
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74 3. Using Equation 3.6, calculate the minimum average failure time, tT,650,80, at the 80°C, 4.48 MPa (650 psi)
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75 for pipes containing recycled materials. Furthermore, since Condition I [80°C / 4.48 MPa (650 psi)
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76 propagation, is not necessary for pipes manufactured with recycled materials and should only be specified for virgin materials. However, given the good historical field performance of current AASHTO M 294 pipes relative to stress cracking, it is suggested to carry over the same requirements as specified for virgin pipes to pipes containing recycled content.
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From page 77... ...
77 tensile strength) of HDPE are stress independent.
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