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Need some insight on compacting a pad

Discussion in 'Heavy Equipment & Pavement' started by toomuchtime, Jan 12, 2010.

  1. AWJ Services

    AWJ Services LawnSite Platinum Member
    from Ga
    Posts: 4,276

    Uncompacted soil will not compact over time. Parking on top of it will only compact the upper layer of soil. Maybe 12 inches down.
    The only way to properly compact the soil is determined by the actual compaction needed as established by the engineer. Different soils compact differently, like sand for instance does not compact so unless someone has actual experience with area they cannot accurately instruct you on how to compact the soil.
  2. Fieldman12

    Fieldman12 LawnSite Bronze Member
    Posts: 1,504

    Yes, I understand all that but around here at least for something like that it would be compacted in lifts. I guess I just have a hard time thinking someone would have done 4' of cut and fill and would have not compacted it as they went along especially since it was suppose to be for a pad in the first place. I agree it depends on the soil type like you and me mentioned.
  3. bobcatuser

    bobcatuser LawnSite Senior Member
    Posts: 350

    It has a bobcat S/N and the tag says Mexico. I don't know who makes it for them.
  4. gammon landscaping

    gammon landscaping LawnSite Senior Member
    Posts: 550

    i would just scratch it up a little and get a 433 cat and roll it all day and call for a inspect
  5. bearmtnmartin

    bearmtnmartin LawnSite Senior Member
    Posts: 342

    Try shopping for a new engineer. Some of them don't even do the actual test. Maybe you can dig a hole and get it passed based on soil composition. Its all about ass covering , not compaction.
  6. YellowDogSVC

    YellowDogSVC LawnSite Gold Member
    from TX
    Posts: 3,758

    I use a bobcat 48" roller. I have passed nuclear tests with it. I pack, crush, and roll base, caliche, dirt, and even gravel. It works good and with a little moisture, you will lock that material in. I prefer to roll in phases, that is, cut, fill, roll, then do it again so that each layer gets compacted but you can probably get enough vibration to get it down deep.
    You might want to try a 72" roller and use it on a 26-30 gpm machine (I think they are high flow rollers). I use mine on 20-22 gpm, however, and it works fine.
  7. curtisfarmer

    curtisfarmer LawnSite Senior Member
    Posts: 511

    Where we live you can compact what ever you wnat to what ever compaction factor....but after 1 freeze thaw cycle, its back to what it was. Water expands 8% when frzen any gravel pad or road/drive expands up...thaws...and tight compaction is gone:(
  8. toomuchtime

    toomuchtime LawnSite Senior Member
    Posts: 267

    Good info guys. We will be tackleing the job on saturday stay tuned for pics!
  9. RHS

    RHS LawnSite Member
    Posts: 19

    If you want to go quick and dirty you could add some portland cement to the mix and essentially make a soil cement. A bit of water and compaction and you will have a pretty solid mixture. Just a thought if you are only looking to pass the test as cost effectively as possible.?????

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