Performance of Corrugated Pipe Manufactured with Recycled Polyethylene Content (2011) / Chapter Skim
Currently Skimming:
Pages 55-68
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 55... ...
A-11 A.4.3 BFF Test for Long-Term Stress Crack Resistance (TRI Method) A P P E N D I X A Procedures and Test Methods
|
From page 56... ...
The melt index was determined in accordance to ASTM D1238, Standard Test Method for Flow Rates of Thermoplastics by Extrusion Plastometer. A sample of plastic was heated inside a standard-sized cylinder for a controlled amount of time.
|
From page 57... ...
Content in Polyethylene Compounds by the Muffle-Furnace Technique. About 1 g of sample was placed in an aluminum dish and heated in a small muffle furnace for 3 minutes.
|
From page 58... ...
A-4 Heat of Fusion (J/g) Onset Temperature (°C)
|
From page 59... ...
A.2.7 Tensile Properties (ASTM D638) The tensile properties were evaluated according to ASTM D638, Standard Test Method for Tensile Properties of Plastics.
|
From page 60... ...
The NCTL test is ASTM D5397, Standard Test Method for Evaluation of Stress Crack Resistance of Polyolefin Geomembranes Using Notched Constant Tensile Load Test. The appendix of D5397 describes a single load test that is very similar to F2136.
|
From page 61... ...
temperatures were explored to determine appropriate conditions for evaluating recycled materials. A different surfactant is necessary because the cloud point of CO-630 is 55°C, so it is immisible at 80°C.
|
From page 62... ...
A.3.3 BFF Test (TRI Method) This test method was first used in these laboratories as a means for classifying the cracking resistance of post-consumer recycled HDPE for a commercial client.
|
From page 63... ...
The junction test is a Florida DOT test method (FM 5-572) and involves a test specimen cut from the pipe itself.
|
From page 64... ...
. It has also been used by TRI to examine PP buried structures and most recently on HDPE resins used for corrugated drainage pipe.
|
From page 65... ...
It should be mentioned here that the transition from one temperature to the next is an important variable in SIM testing. The time it takes for the specimen to equilibrate at the new temperature should be just a few minutes.
|
From page 66... ...
A-12 22500 23000 23500 24000 24500 25000 25500 26000 26500 27000 27500 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 5.95 6 6.05 LOG TIME (sec)
|
From page 67... ...
And, constant B can be found by substituting the equations derived above into Equation 1. Example Problem: Given the following failure times, calculate the three constants.
|
From page 68... ...
This value represents the average lifetime based on the test results. Long-Term Strength Once the constants are known, one can also calculate the 50 year strength at 23°C from equation 1.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.