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Refinishing a section of concrete floor

Discussion in 'Heavy Equipment & Pavement' started by AEL, Feb 15, 2011.

  1. AEL

    AEL LawnSite Bronze Member
    Messages: 1,724

    Hey guys, I have a contract with a large automotive parts, and service chain across canada to excavate contaminated materials, remove automotive hoist components, backfill and install concrete floor where the old inground hoists were.

    Well long story short i had a few of my guys to do the concrete and cleanup last week, and sure enough i get a phone call today saying they are not happy with the concrete. I arrive on site as soon as i can to see that the concrete has a high spot in one area of about 3/4 of an inch and the finish on it is not as nice as it should be.

    My idea to fix this without having to rip up the slab is to some how break the slab about an inch deeper then the existing floor, and repour the new concrete. The area is about 4x10. Any thoughts or ideas?

  2. ARP

    ARP LawnSite Bronze Member
    Messages: 1,510

    What do you think about taking a walk behind chop saw where you can set the depth, and cut 1" deep lines in a very tight bar pattern across the affected area (tight as in 1" apart, make it look like very tight rumble strips you see on the highway). Then take a chisel and sledge and go to town chipping out each bar. It would be a lot of hand work, but it should save you from ripping the floor up completely.
  3. treemover

    treemover LawnSite Senior Member
    Messages: 418

    No bigger than the area I would say rip it up. They make concrete rotory sanders with diamond discs. Then you would have to polish is out.
  4. Boss Exc.

    Boss Exc. LawnSite Member
    Messages: 130

    4x10?Rip it up and start over.

    They can't all go perfectly.Ask me how I know...
  5. AEL

    AEL LawnSite Bronze Member
    Messages: 1,724

    i forgot to mention the floor is apprx 9" thick . (as specd by engineer) Quite a bit to remove and repour.
  6. bobcat_ron

    bobcat_ron LawnSite Fanatic
    Messages: 10,131

    4x10 and only 9" thick, dude that would take me literally 15 minutes to break with a rental Cat hammer on my skid steer.
    Get a gas powed diamond saw on wheels and cut right through and rent a hammer.
    Then yank out the concrete and drill and dowel with some epoxy, use a concrete bonding agent on the surfaces, repour and use a brush to feather the edges.
    Nothing to it.
  7. AEL

    AEL LawnSite Bronze Member
    Messages: 1,724

    Appreciate the help guys. I understand what is needed to be done to remove the concrete ( i had to remove it in the first place to remove the hoist cylinder) i obviously wanted to save some coin and do it without removing all the concrete again, and incuring further cost.

  8. Danny Boy

    Danny Boy LawnSite Senior Member
    Messages: 255

    I would rip it up too, gotta make the right impression with the client especially as its an ongoing contract. And it sounds like your concrete contractor should absorb the expense or at least share it?
  9. AWJ Services

    AWJ Services LawnSite Platinum Member
    from Ga
    Messages: 4,281

  10. SVA_Concrete

    SVA_Concrete LawnSite Senior Member
    Messages: 467

    Depending on the floor tolerances you may be able to use a floor plane (edco makes one) to remove the material, and then hit it with a floor grinder.

    all in all it will be more expensive than Replacing 1.5 yards of concrete.

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