Retrospective Evaluation of Cured-in-Place Pipe - (NEPIS)(EPA ...

4.3.6.2 Downstream Sample. Seven specimens from the downstream sample were used in this test.
The average specific gravity for the sample was calculated to be 1.07 and standard deviation 0.04.
In addition to the TTC laboratory measurements of specific gravity, measurements of density and porosity
of a sample from this liner specimen were made by Micrometrics Analytical Services. In its testing
(using mercury penetration for the porosity determination), the bulk density (at 0.54 psia) was
1.1645 g/mL, the apparent (skeletal) density was 1.3123 g/mL, and the porosity was 11.262%. The full
test report is provided in Appendix C.
4.3.6.3 Upstream Sample. Seven specimens from the upstream sample were used in the TTC testing
for specific gravity. The average specific gravity for the sample was calculated to be 1.08 and standard
deviation 0.03.
In addition to the TTC laboratory measurements of specific gravity, measurements of density and porosity
of a sample from this liner specimen were made by Micrometrics Analytical Services. In its testing
(using mercury penetration for the porosity determination), the bulk density (at 0.54 psia) was
1.1618 g/mL, the apparent (skeletal) density was 1.2933 g/mL, and the porosity was 10.171%. The full
test report is provided in Appendix C.
4.3.7 Flexural Testing
4.3.7.1 Downstream Sample. Specimens were cut from the retrieved downstream CIPP liner sample
in accordance with ASTM D790 for measuring the liner’s flexural strength and flexural modulus of
elasticity. A total of five specimens were prepared and tested. The sides of the specimens were smoothed
using a grinder and a table router. The water jet cutter could not be used due to curvature of the liner.
Testing was performed using an ADMET eXpert 2611 Universal Testing Machine (UTM) as shown in
Figure 4-33. Table 4-14 lists the dimensions and moment of inertia for all specimens. Table 4-15 and
Figure 4-34 summarize the flexural test results for the Denver 48-in. downstream sample.
Figure 4-33. Flexural Test in Accordance with ASTM D790
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