The data is being used in our project's routine testing. Design CBR requirement is min 15% for subgrade.
Thanks again very much for your valuable information and analysis, it was very helpful. I'll keep these points in mind for our future lab test reports.
regards
Thank you geobdg,
That makes a whole lot of sense.
So, if re-testing produces similar results, then we are safe to conclude that the soil with 100% compaction is loosing strength due to access load caused by the plunger thus getting less CBR values and the material that is below 100%...
Hi Ron,
We're talking here the Design CBR for one water content only.
Now, since all three specimens are compacted using the same (optimum) water content, I am kinda confused that how to compare those 3 specimens with proctor curve.
Of course, we can see that the density at 65 blows is pretty...
Thanks Ron for your answer.
My apologies, forgot to mention that all 3 specimens are compacted at optimum moisture content.
Optimum moisture content & maximum dry density is obtained using modified Proctor (AASHTO T 180 Method D)
CBR is being checked at 95% compaction of maximum dry...
hi
We are performing CBR according to AASHTO T 193.
It has been happening for some time now that we are getting CBR vs Compaction curve different then typical curves. That is, for example:
CBR value at 10 blows is higher then the 30 & 65 blows value and CBR value at 65 blows is higher then 30...
