Perm Saturation Time
Perm Saturation Time
(OP)
Ok, here's a new question that I'm sure will have alot of different answers. I am running falling head perms using a compaction mold. How do you judge times that it takes to saturate a recompacted sample? Is there a time of saturation calculation that I can use or do I just have to follow the lab readings and find when the drop levels out? I am fairly new at running these tests and just want to make sure I am giving the samples ample time to saturate before passing/failing the tests. Thanks for any help.





RE: Perm Saturation Time
Not sure, but hope this helps.
p.s. unsaturated permeability is a lower value than saturated permeability.
f-d
¡papá gordo ain't no madre flaca!
RE: Perm Saturation Time
RE: Perm Saturation Time
Another factor, did you compact the sample on the wet or dry side of optimum? If this is a recompacted sample, you will realize great saturation at the start of the test if you compact it wet of optimum (duh, eh?). The big benefit however is you will also get a MUCH lower saturated permeability value after fully saturated (i.e., as compared to the sample compacted dry of optimum). The difference can be an order of magnitude!
Good luck in your work. You should be able to find a local geotechnical laboratory to do a recompacted perm test for a few hundred bucks, however.
f-d
¡papá gordo ain't no madre flaca!
RE: Perm Saturation Time
Will regulators buy that? I doubt it.