SHRP-A-379 traducir

10.8 Stripping Evaluation
10.8.1 At the conclusion of the last conditioning cycle, remove the specimen from
the environmental chamber. Remove the membrane from the specimen and place it in a
diametral position between two bearing plates of a loading jack on a mechanical or hydraulic
testing machine.
10.8.2 Apply a load sufficient to induce a vertical crack in the specimen.
10.8.3 Remove the test specimen and pull the two halves apart. Estimate the
percentage of stripping that has occurred by making a relative comparison to the standard
patterns of stripping shown in figure 6.
11. CALCULATIONS
11.1 Calculate the following:
11.1.1 Cross Sectional Area (m2):
A---
_rd 2
40,000 (1)
where
d = Average diameter of the test specimen, in cm
_r = 3.14159
11.2 After conducting the air permeability testing outlined in section 10.2, calculate
the following:
11.2.1 Coefficient of Permeability of Air Flow (cm/s):
where
ka = 1.7937 × 10-8qL
AP (2)
ka = Coefficient of permeability for air flow, in cm/s
q = Flow rate of air at mean pressure across specimen, in cm3/min
L = Average height of the test specimen, in mm
AP = Pressure difference across the specimen, mm Hg
11.3 For the last five load cycles applied as specified in section section 10.3,
calculate the following:
NOTE 11.--The ECS software should automatically make the computations described in sections 11.3, 11.4,
and 11.6.1.
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