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Saturation of the sample at triaxial test

Saturation of the sample at triaxial test

Saturation of the sample at triaxial test

I am doing CU triaxial test on silty sand sample ( sand + 40% low plastic fine content ), I faced with a problem in saturation phase.
I let the Co2 gas goin through the sample about 1 hour then using deaired water, but after 1 day waiting the water does not
move through the sample any more, also I have used cell pressure 2.5 bar and back pressure 2 bar to remove the rest gas in voids, but the sample would not fully saturate.
Would you please suggest me to find the best solution for this problem?

RE: Saturation of the sample at triaxial test

Hi, Regen
How much your B-value? if it is equal or more than 0.95. That should be ok.

RE: Saturation of the sample at triaxial test

Yes, you are right, but in my case its around 0.75-0.8.

RE: Saturation of the sample at triaxial test

you need more backpressure, which means you need more cell pressure too. It seems you are at and effective stress of about 1,000 psf. Does that replicate the in-situ effective stress? Then again, this may be a recompacted sample, which means you likely compacted it near the optimum moisture content, which is likely to be about 85 percent saturation.

I agree wtih L0k, if the B-value is 0.95, you're there. A B-value of 0.95 does not correlate to 95 percent saturation, it's greater.


ípapß gordo ainÆt no madre flaca!

RE: Saturation of the sample at triaxial test

Thank you very much for your comments.

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