when do you know to use a modified proctor D1557, verses a standard proctor D698.
when do you know to use a modified proctor D1557, verses a standard proctor D698.
(OP)
I would like to know when I would perform a lab test on material taken from the job site that does not specify what proctor to use, when would I know which lab proctor test to use, modified proctor verses a standard proctor.






RE: when do you know to use a modified proctor D1557, verses a standard proctor D698.
RE: when do you know to use a modified proctor D1557, verses a standard proctor D698.
ask the following:
what type of material is it, fine or coarse grained?
what is the loading on the compacted embankment? Is there pavement or structures constructed on top of it?
is the compaction being done to reduce settlement or to reduce permeability or to increase slope stability?
Will this be compacted with a whacker or an 18 ton padded foot vibrating compactor? Is the material gravel base for a road or landfill cover material?
Is this landscaping fill or embankment for a dam?
RE: when do you know to use a modified proctor D1557, verses a standard proctor D698.
The standard proctor and its lower input energy is more comparable to light, static compaction, particularly in finer grained soils with some plasticity.
RE: when do you know to use a modified proctor D1557, verses a standard proctor D698.
Where would the standards/specifications be on which method should be used? Or is it just judgment based upon the principles stated above?
RE: when do you know to use a modified proctor D1557, verses a standard proctor D698.