Ron- we run into this constantly with low fines material. This is why ASTM has the relative density standard, but very little labs do this. They still use Proctor. The last wonky point will be a mud puddle, standing water/pumping. We seal the bottom of our mold to prevent seepage. These are...
We do these almost every week and this was a rare one. When plotting the failure envelop on the first two circles the line was closer to zero, but barely negative -0.2psi. When adding the third circle it increased the angle to have the cohesion to be around -3.5psi. I went with the first two...
Hello, we run 3-stage CU tests, and had one that created a very steep failure envelope tangent to the Mohr circles that crossed the Y axis below 0. That would give us a cohesion value that is negative. Is that even possible? Would you just call the cohesion 0 and plot the failure envelope...
I have been doing all the research I can on this topic, and I have gotten mixed results. A traditional nice parabolic curve with at least 4 points to find your OMC and MDD on higher fines content soils is great. Works every time. I understand that soils with low fines content should be run by...
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This is in response to the another thread that mentioned bleeding water while running free draining proctors, and I would like to re-open the discussion.
I manage a soils lab for a Geotechnial firm, and the majority of questions or challenges come from preforming compaction...
