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

4.3.10 Barcol Hardness
4.3.10.1 Downstream Sample. Seven specimens from the exhumed downstream sample were
subjected to the Barcol test (ASTM D2583). Due to the presence of dust and debris on the outer wall of
the exhumed CIPP slabs (Figure 4-42), a belt sander was used to achieve a smooth surface. The inner
surface of each sample was kept unaltered (Figure 4-43). A wooden base was prepared to match the
thickness of the specimens, and the Barcol hardness tester (Figure 4-44) was placed on that platform to
conduct the test (Figure 4-45).
Figure 4-42. Original Outer Surface
(Denver 48-in. Downstream Sample)
Figure 4-44. Barcol Hardness Tester, Taking a
Measurement
Figure 4-43. Smoothed Outer Surface (Top Row) and
Inner Surface (Bottom Row)
(Denver 48-in. Downstream Sample)
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Figure 4-45. Barcol Hardness Test Setup
For each specimen a total of 30 readings were taken: 15 on the outer surface and 15 on the inner surface.
Similarly to the durometer (Shore D) hardness test, it was found that the measured inner surface hardness
values were lower than those measured on the outer surface.
The average calculated values and their standard deviations are shown in Figure 4-46. The weighted
average of Barcol hardness for the sample inner surface was calculated to be 16.5 and the weighted error
±1.5, and for the outer surface 29.3 ±1.3.