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Compaction of Open Graded Fills
2

Compaction of Open Graded Fills

Compaction of Open Graded Fills

(OP)
Frequently, I run into situations on job sites where the contractor wants to place open graded stone (such as #57 Stone) in large, dumped lifts with no compactive efforts.  Typically, this is behind cast-in-place retaining walls.  The comment that I have heard over and over is that "#57 stone is a 'self-compacting' item."  This, of course, is not true, and I get a lot of resistance from contractors when I tell them that compaction in lifts is required.  They don't want to hear that settlement of open-graded stone can be significant if 'dump-filled' in thick (4'+) lifts.

Which leads me to my question.  Are there any available papers or letters that other professionals may have published on this subject?  The next time I hear that #57 is 'self-compacting' it would be nice to have something that I can use as a reference, other than common sense.

RE: Compaction of Open Graded Fills

2
Why don't you run a max-min density test in the lab and figure out the potential volume change when stone goes from the uncompacted state to fully-compacted state?  

RE: Compaction of Open Graded Fills

Kam,
What is a max-min density test?

RE: Compaction of Open Graded Fills

Refer to ASTM D2049

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