soil density after compaction
soil density after compaction
(OP)
I am involved with a project in which fill material had been placed several months ago in a greenbelt area. The compaction specification arrived at by others was 95 percent of the standard proctor density, which was achieved at the time. It is now contended, though, that the compaction of the soil placed was lower than this, and the contractor would like to re-test the material that has been placed.
The soil has been re-vegetated, and has been exposed to many wetting/drying events do to the length of time that has lapsed since placement. The total fill placed is at most 3 feet. The soils placed were clayey sand (A-2-6) with a fines content of about 30 percent.
I think everyone in this project understands that there is a certain amount of variability inherent to the placement of fill, but I am looking to resources to turn to that would maybe help explain a lower compaction at the surface should it be the case that the new test results are different. Can anyone help with this?
The soil has been re-vegetated, and has been exposed to many wetting/drying events do to the length of time that has lapsed since placement. The total fill placed is at most 3 feet. The soils placed were clayey sand (A-2-6) with a fines content of about 30 percent.
I think everyone in this project understands that there is a certain amount of variability inherent to the placement of fill, but I am looking to resources to turn to that would maybe help explain a lower compaction at the surface should it be the case that the new test results are different. Can anyone help with this?





RE: soil density after compaction
RE: soil density after compaction
If the project has not been turned over to the owner, the contractor's obligation to deliver as specified remains.
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ípapß gordo ainÆt no madre flaca!
RE: soil density after compaction
The question I have is who thinks that the compaction wasn't achieved? Was it not tested by a reliable geotechnical/testing firm or a similar entity hired by the contractor? If it was tested, what is the "observation" that the material might have "lost" compaction? - and if this is landscaping type area only, what is the difference if it is 93% or 95% or 98%? Unless you are anticipating placing structures it would seem to me to be a moot point other than contractual issues. There seems to be a strong "fixation" on 95%. Can anyone really tell the difference of behaviour of 94% compared to 95% - or 95% to 96%?
RE: soil density after compaction
RE: soil density after compaction
Compaction is the controlled disturbance of soil to achieve desirable engineering properties.
There is no soil which cannot be uncompacted by uncontrolled disturbance when left unprotected by overlying layers.