Posted 27 March 2012 - 11:31 PM
TOTAL percent retained: Sieve 4-4%, Sieve 8-11%, Sieve 16-21%, Sieve 30-22%, Sieve 50-24%, Sieve 100-17%, Dust pan-1%.
If you total all of the TOTAL percentages you get 100.
CUMULATIVE percent retained data: Sieve 4-4%, Sieve 8-15%, Sieve 16-36%, Sieve 30-58%, Sieve 50-82%, Sieve 100-99%.
If you total all of CUMULATIVE data you get 294.
My question is which set of data do I use to classify the soil for USCS and AASHTO? Is it the TOTAL or CUMULATIVE percent retained (or passing depending on which data is provided). I know I need the cumulative data if I want to calc a fineness modulus(unreated to soil classification) but I am unclear on which data set to use for classification.
Please help. I have pulled out many hairs over this as you can see!
Posted 28 March 2012 - 04:08 PM
Posted 29 March 2012 - 09:09 PM
Posted 30 March 2012 - 01:10 AM
Posted 30 March 2012 - 02:12 PM
Use cumulative. Verify this by all the example problems for soil classification - 6 min. geotech solutions, CERM, etc. all use cumulative % passing.
Posted 31 March 2012 - 03:08 PM
Posted 01 April 2012 - 11:00 PM
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