How to fill up rock-membrane annulus in 170¦C triaxial test?
How to fill up rock-membrane annulus in 170¦C triaxial test?
(OP)
Hi,
I want to perform a tempered (~170°C) permeability test in a heatbale triaxial test device.
Problem: The rubber membrane, filter disk plates, load ram, etc... are build for 64 mm diameter samples - my samples, however, have a diameter of 60 mm.
Thus, I have an annulus with a width of 2 mm. Too much to be left open, the membrane creases.
I'm now searching for a method to fill this open space with a material that has a lower permeability than the rock (mudstones), does not affect the consolidation and resists the elevated temperature.
Ideas for now are...
...using a second rubber membrane with a diameter of 60 mm and thickness of 1 mm. However, pushing the rubber-covered sample into the 64 mm rubber membrane will probably be quite complicated.
...wrap around teflon duct tape around the sample, however material consumption will be very high, as this type of tape is usually very thin and samples are 10 to 15 cm long.
...fill up the annulus with some kind of silicone gel, however the membrane can than (most likely) not be reused. Furthermore, if the gel penetrates the sample, the permeability is reduced.
...?
I want to perform a tempered (~170°C) permeability test in a heatbale triaxial test device.
Problem: The rubber membrane, filter disk plates, load ram, etc... are build for 64 mm diameter samples - my samples, however, have a diameter of 60 mm.
Thus, I have an annulus with a width of 2 mm. Too much to be left open, the membrane creases.
I'm now searching for a method to fill this open space with a material that has a lower permeability than the rock (mudstones), does not affect the consolidation and resists the elevated temperature.
Ideas for now are...
...using a second rubber membrane with a diameter of 60 mm and thickness of 1 mm. However, pushing the rubber-covered sample into the 64 mm rubber membrane will probably be quite complicated.
...wrap around teflon duct tape around the sample, however material consumption will be very high, as this type of tape is usually very thin and samples are 10 to 15 cm long.
...fill up the annulus with some kind of silicone gel, however the membrane can than (most likely) not be reused. Furthermore, if the gel penetrates the sample, the permeability is reduced.
...?





RE: How to fill up rock-membrane annulus in 170¦C triaxial test?
Use the 60mm membrane, double if necessary, and lubricate with silicone lubricant such as K-Y or similar (cheap and available). Slide lubricated, encased sample into the 64mm membrane...should work.
RE: How to fill up rock-membrane annulus in 170¦C triaxial test?
Ron's method would work too, but I don't think the lubrication is necessary. This is only a permeability test, right?
RE: How to fill up rock-membrane annulus in 170¦C triaxial test?
RE: How to fill up rock-membrane annulus in 170¦C triaxial test?
Can you not get someone to make up a seating platform and head adapters for your 60mm samples?