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RE: SOIL DENSITY - COMPACTION TESTING

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I don't believe there is a mathematical connection because both methods of
testing are different.  The standard Proctor test compacts soil in 3 layers
by a specific number of hammer blows.  The modified Proctor test compacts
soil in 5 layers with a heavier hammer falling a greater distance than the
standard Proctor test.  The reason for the "modified" is because it yields
more relative compaction densities when using modern compacting machinery in
the field.  The Civil Engineering Reference Manual by Professional
Publications only lists a vague +/- correlation between these methods.
Requesting the soil lab to run the modified test may be your best option.

William J. Keil, P.E.


-----Original Message-----
From: Mark Trimble [mailto:trimbleml(--nospam--at)kjww.com]
Sent: Thursday, October 07, 1999 10:04 AM
To: SEAINT(--nospam--at)SEAINT.ORG
Subject: SOIL DENSITY - COMPACTION TESTING


Can anyone help me find how to mathematically relate a modified proctor
density value to a standard proctor?
thanks