hair line on concrete slab

Discussion in 'Bricks, Masonry and Concrete' started by axe, Feb 23, 2010.

  1. Feb 23, 2010 #1

    axe

    axe

    axe

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    hi,

    I got my concrete pour in 5 sacks about 14 yards. After the contactor finish pouring the slab. I started to see hair line crack through out the drive way. Why is that. He said sometime it has that crack.
     
  2. Feb 23, 2010 #2

    inspectorD

    inspectorD

    inspectorD

    Housebroken Staff Member Admin Moderator

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    Concrete shrinks, and you need to groove a control joint into the concrete. This way the crack is going to be less noticable.

    Just the way it is.:(
     
  3. Feb 23, 2010 #3

    Wuzzat?

    Wuzzat?

    Wuzzat?

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    Have him put that statement in writing, signed and dated.
     
  4. Feb 23, 2010 #4

    funetical

    funetical

    funetical

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    So then cracks in cement are normal?
     
  5. Feb 23, 2010 #5

    Wuzzat?

    Wuzzat?

    Wuzzat?

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  6. Feb 26, 2010 #6

    itsreallyconc

    itsreallyconc

    itsreallyconc

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    normal ? no, of course not ! ! ! if that were the case, it wouldn't be the world's largest building mtl,,, however, they aren't unusual & the fault's often found w/the contractor,,, you don't mention what TYPE of crack's there so its difficult to give any advice,,, do like the idea of a sign'd letter - good luck w/that ! ! ! :rofl:
     
  7. Mar 24, 2010 #7

    axe

    axe

    axe

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    Thanks for the reply. He does have control joint. It even crack on the smallest slab that is only 5x8. THat why it drive me naughts. Concrete sucks. but what it is, is what it is. Thanks
     
  8. Mar 24, 2010 #8

    mudmixer

    mudmixer

    mudmixer

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    axe -

    If the contractor used too much water or idi not finish the concrete correctly, you can expect cracks (especially thin surface cracks). - That is why there are good contractors and bad contractors.

    The surface cracks are not minimized by control joints that are for other purposes.
     

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