Pipe #4. The fourth pipe tested was a 16" diameter, HDPE specimen. This specimen was used to repeat the first specimen tests with a different pipe and additional instrumentation. The test was performed with a 3' cover of soil. The pipe specimen was mounted in the test boxes with the end couplings outside the boxes and shimmed to the ends of the boxes. The move-able test box was pushed four feet, forcing the pipe into bending and tension, as in the first three pipe tests.
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