Specification for Compaction of a Dense/Open Graded Aggregate(#78)?
Specification for Compaction of a Dense/Open Graded Aggregate(#78)?
(OP)
I've been looking on the forums, and am aware of the discussions that you've had regarding compaction of aggregate fill. The usual recommendation for compaction seems to be requiring placement in lifts of a ranging depth, and then passing over a couple times with some kind of tamper or vibratory compactor.
Is there some kind of standard specification for this? I'm also looking for a test to ensure that the aggregate has reached it's maximum relative density, but it seems very difficult to measure this in-situ. The closest test I've come across appears to be the sleeve method (ASTM D4564-08), but it isn't ideal for this application either.
Any help on this matter would be greatly appreciated.
Is there some kind of standard specification for this? I'm also looking for a test to ensure that the aggregate has reached it's maximum relative density, but it seems very difficult to measure this in-situ. The closest test I've come across appears to be the sleeve method (ASTM D4564-08), but it isn't ideal for this application either.
Any help on this matter would be greatly appreciated.





RE: Specification for Compaction of a Dense/Open Graded Aggregate(#78)?
RE: Specification for Compaction of a Dense/Open Graded Aggregate(#78)?
Open graded aggregate fills are usually tamped in layers (18 inches thick) to consolidate. A plate tamper can be used for this purpose. There is no practical method for density testing in the field for open graded aggregate.
If density of the stone is that critical then use dense graded aggregate.
RE: Specification for Compaction of a Dense/Open Graded Aggregate(#78)?
Using a plate compactor for an 18" lift of anything is not advisable. They are light and have little depth influence, so the lifts should be much thinner than that.
As for the sand-cone, you will note that I said you would have to modify the sand-cone hole by lining with Saran wrap. This works fine and doesn't introduce significant error as the repeatability of density testing in open graded aggregates is not as you would expect in typical soil or soil-aggregate mixtures.
RE: Specification for Compaction of a Dense/Open Graded Aggregate(#78)?
RE: Specification for Compaction of a Dense/Open Graded Aggregate(#78)?
Would 8" lifts be sufficiently thin for the plate compactor to penetrate with this aggregate?
RE: Specification for Compaction of a Dense/Open Graded Aggregate(#78)?