field cbr vs. lab cbr
field cbr vs. lab cbr
(OP)
hello everyone
i know this is a repeated question but i did not find a good answer , is there a correlation between in-situ cbr and lab cbr , because i'm trying to relate DCP TO CBR for a specific type of soil
i know this is a repeated question but i did not find a good answer , is there a correlation between in-situ cbr and lab cbr , because i'm trying to relate DCP TO CBR for a specific type of soil





RE: field cbr vs. lab cbr
I prefer saturated CBR values derived by the 48 hour soaking period of the ASTM method.
f-d
ípapß gordo ainÆt no madre flaca!
RE: field cbr vs. lab cbr
RE: field cbr vs. lab cbr
f-d
ípapß gordo ainÆt no madre flaca!
RE: field cbr vs. lab cbr
You have, though, failed to identify the type of cone penetrometer you will be using. There are a number of different ones - the TRRL cone, the Mackintosh Probe, the Pentest (Canada's 140# hammer dropping 30"), etc. There have been a number of discussions on this.
Fattdad is correct in that the lab value is a soaked value and the CBR in the field and cone penetrometer in the field are relative to that particular moisture content - which in the summer (Northern hemisphere) can be "dry" and in the wetter months, nearly saturated. This will make a difference. I tried (and failed) to get a contractor in Laos to do a soaked test and a "dry" test of the same sample in order to get a correlation of the CBR saturated and CBR at or nearly at OMC. If one were to do many tests to develop a good correlation - one might be able to correlated DCP test results to the soaked values of CBR. We usually did our CBRs at 95% of the standard MDD (the requisite relative compaction level specified).
RE: field cbr vs. lab cbr
so would it be OK to correlate dcp to lab (soaked) cbr if i prepared samples with same density as in field ?
RE: field cbr vs. lab cbr