Expansion Index
Expansion Index
(OP)
Hello All,
is there any criteria for testing for expansion using a 2.5 inches california ring? is there a paper related to that?? or any kind of relationship? any tip would be appreciated
Thanks.
is there any criteria for testing for expansion using a 2.5 inches california ring? is there a paper related to that?? or any kind of relationship? any tip would be appreciated
Thanks.





RE: Expansion Index
RE: Expansion Index
ZTGR:
Do you have a consolidation setup modified to accept the 1 inch rings directly? If so, use the appropriate ASTM test procedure. Just remember to increase the loading times by about 80%, or use square root of time procedures to evaluate when primary swell/rebound is complete. (I'd expect it to take 2 to 3 days for free swell in a moderately to highly plastic clay.)
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Expansion Index
1- Ashayeri:
a California ring is used to collect undisturbed soil samples, a similar use to the shelby tube. it is cupper made and 25.4 mm in height, 61.37 mm in internal diameter, the sampler is similar to the split spoon but larger in diameter and it's aproximately eighteen inches in height. one sample constitute of six rings.
2- Focht3:
I would like to thank you for your replies as always! you're the most helpful on this site. I always do a small search, consult other sources before i post on this website, I couldn't find any published paper about another procedure for expansion test other than the ASTM. A previous research conducted by one of the consultants in Southern California developped a relationship between swell data and the expansion index.
RE: Expansion Index
I know that the term "undisturbed" is often used in the same sentence with California samplers - but it's just plain wrong. You can't use a hammer to drive a sampler into the ground, and call the resulting sample "undisturbed." This kind of "uncritical thinking" could get you into trouble some day. Driven samples are never even "relatively undisturbed." (Many push samples don't deserve that description, either...)
Always remember that your choice of words affects (and reflects) how you treat a problem -
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Expansion Index
I am sorry about calling it Undisturbed, I should call it Relatively Undisturbed.
RE: Expansion Index
I've heard of sleeved split spoon samplers but never used them. Of course, we use them in triple tube coring operations.
RE: Expansion Index
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.