Compaction Perm
Compaction Perm
(OP)
I have a simple question that I hope someone could answer. What method do you use to compact the material in the mold to acheive 95%? Obviously you need a specific amount of soil in the constant mold volume to produce a density. I calculate the amount of soil needed and place it in three lifts in general accordance with ASTM D698 although it takes about half the blows needed per the ASTM. Some times the amount of blows is too much and the soil is below the lip so over-compacted. Sometimes the blows are too little and the soil is above the lip so under-compacted. Does anyone out there have a better way at getting the density correct? Right now it appears to be trial and error and my lab tech compacting the soil is getting frusterated.





RE: Compaction Perm
There have been more general Information about such problems in a very funny thread here, I think last month.
RE: Compaction Perm
RE: Compaction Perm
My only experience comes from the Soils Lab class that I was required to take for a CE degree. The class performed a standard Proctor Compaction test. The soil is compacted so that it is above the top of the mold. Then, the excess soil is removed by trimming with a straight edge before weighing.
A good book for the fundementals is Soil Mechanics Laboratory Manual by Braja Das. An understanding of the basics of soil mechanics is required. Das also wrote a good text on soil mechanics, Principles of Geotechnical Engineering.
RE: Compaction Perm
RE: Compaction Perm
RE: Compaction Perm
It does take trial and error to get the proper amount of dirt into the mold however. . .
f-d
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