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8.
Place the overflow from the water collection flask into the beaker and set
the beaker on the right load stand.
Make sure the rubber stoppers form a tight seal.
This setup allows the unit to automatically measure the filtrate and gas
volume collected during the test. Both the filtrate and the nitrogen gas
will be captured by the back pressure receiver. From there, it is emptied
into the filtrate flask. The filtrate will then be weighed by the load stand,
while the gas will be pushed into the water collection flask. In the water
collection flask, the gas displaces the water and pushes it into the beaker
where it is weighed by the load stand.
Since the density of water is 1 g/mL, the weight (in grams) of the
displaced water corresponds to the volume of nitrogen gas that has
migrated through the cement.
9. Return to the computer screen and wait for the “Filtrate Volume” and “Gas
Volume” values to stabilize. Zero both of these values.
Overflow
Beaker
Load Stand
Water Collection Flask
Load Stand
