Remolded Triaxial Test

[moontanner92]

I am trying to get some information on remolded triaxial testing. Any info on sample preparation, or any links or important reading materials are much appreciated. What is different about how you prepare a remolded sample? I am just doing some research on the subject.

Thank you!

 

[LRJ]

I'm unaware of a specific standard for this. Sample preparation seems to vary from lab to lab, though I've known labs to grate a sample before mushing it up with a knife and squashing into the mould. Care needs to be taken to ensure consistent density throughout the sample and also to ensure that the density and water content are the same as the corresponding intact test.

 

[fattdad]

what's the end game? Are you trying to get peak strength for an embankment design? Are you trying to evaluate the long-term performance if softening develops? Are you trying to replicate in-situ conditions in the absence of undisturbed sampling.

I mean I usually don't even reply to such general inquiries. So, the point I'm making is you need to tell your story to get help.

f-d

ípapß gordo ainÆt no madre flaca!

 

[Okiryu]

moontanner92, sorry to use this thread for asking a question (but it is related to your question though): I was researching on re-use clays (CH and CL) as fill material for some sites in order to install slab-on-grades and mechanical/electrical pads. Basically, the remolded/compacted clays will be the "engineered fill" of my specific projects. So, I did some modified proctors and try to get the remolded samples at different water contents so I may replicate the site conditions (i.e grade of compaction). Then I run some unconfined compression tests to get the secant modulus and check for elastic settlements of the fill.

To the people here: Do you think that this is a reasonable approach? Do you have any other recommendations on how we can check/anticipate the behaviour of compacted cohesive fills?

 

[aeoliantexan]

A paper was presented just last week at the USSD 2016 Annual Conference that may be useful to both of you. It is Shear Strength of Compacted Beaumont Clay for Consolidated-Undrained Conditions by Mark J. Thompson, David J Bentler, Thomas L. Brandon, and Daniel R. VandenBerge. It addresses the effects of specimen preparation, failure criteria, specimen volume change, and laboratory compaction vs field compaction. I don't know if you can buy the proceedings, but perhaps one of the authors can help you. Brandon is at Virginia Polytechnic Institute, and VandenBerge is at Tennessee Technological University.

 

[Okiryu]

Thanks aeoliantexan. I remembered that there was an ASCE conference in the 60's about compacted clays in Boulder, CO. So will try to check on this also. Thanks again.

 

[Okiryu]

I found this site very useful:

http://cedb.asce.org/CEDBsearch/record.jsp?dockey=0138193

Problem is to pick the correct paper for your specific case.