Concrete grinding

  1. scottmk1

    scottmk1 Forum Supporter

    Messages:
    780
    Location:
    Scotland
    I have a concrete slab on my drive, just in front of the garage door. It's where I park as the rest is gravel & that's where I work outside if its a decent day. Unfortunately the slab has a dip in the middle indicating that all edges are higher, obviously this makes a large puddle when wet which is only 3 or 4mm deep but over a fair area of the slab. The slab is about 30m2 overall.

    I was considering what I can do about this as it's a pain in the arse really. Googling brings up concrete grinding. Has anyone any experience of this? I've seen polished concrete showing the aggregate but on my drive I don't want a polished surface, as this would obviously end up like an ice rink when wet. So can this be done just to bring the concrete flat or even with a slight camber? But with a rough finish so I don't look like Mr Bean ice skating every time I go to the car.

    Alternative suggestions welcome.
     
  2. Windy Miller Forum Supporter

    Messages:
    2,553
    Kent, UK
    scottmk1 likes this.
  3. slim_boy_fat

    slim_boy_fat Forum Supporter

    Could you cut a small channel to drain the water back into the gravel area?
     
  4. scottmk1

    scottmk1 Forum Supporter

    Messages:
    780
    Location:
    Scotland
    That was one thought, not quite sure how to do that in concrete and make a tidy job of.
     
  5. postie jon Member

    Messages:
    731
    Location:
    Aberdeenshire, Scotland
    coredrill and put in a drain
     
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  6. addjunkie

    addjunkie Member

    Messages:
    4,745
    Location:
    Northumberland. Reet oot in the sticks
    Runways have a series of groves cut into them to avoid this!

    Wouldnt be too difficult to do on your drive with a diamond disc and some kind of guide to keep the line strainght, and the cut not too deep.
     
  7. Melvyn Best Member

    Messages:
    51
    Location:
    Cambridge
    I once had a workshop with an uneven floor that I used what I think was called a “Scrabbler”? hired from a local hire company, worked a treat.
     
  8. Any kind of grinding is going to be horrendously expensive, simplest and most cost effective solution would be to break out a channel and put a gully drain in. clearly they didn't think very hard about the fall when they built the slab so worth also taking some levels to make sure it is possible to drain.
     
  9. Morrisman

    Morrisman Member

    Or drill/dig a 6” hole in the middle, deep as you can, and fill it with gravel, like a mini soakaway. Put a nice round drain cover over the top.

    You could do oil changes in it too. :scared:
     
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  10. Divingdad

    Divingdad New Member

    Messages:
    4
    Location:
    UK Northampton
    I had similar issue and solved with an exterior floor levelling compound.
     
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  11. johnser

    johnser Member

    Messages:
    1,658
    Location:
    North Cornwall
    If it's not too far to the neareast edge of the concrete, you could use a diamond disc in a grinder to smooth/rub a shallow gulley in it.

    Narrow, pointy channels tend to jam up with grit, but a low, smooth, wide slope is easier to keep clear.

    It'd probably stuff up a disc doing it but they're not that expensive.

    May not be an option if the nearest edge is a long way off. Then, a core drill sounds good.
     
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  12. gaz1

    gaz1 Member

    Messages:
    7,250
    Location:
    westyorkshire
    i cut a water channel in the cement to stop blow through under the garage doors of blown water
     
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  13. angellonewolf

    angellonewolf Member

    Messages:
    3,774
    Location:
    bristol england
    know any one with a wall chaser for putting in cables ideal

    [​IMG]

    could even put down a piece of wood to get it stright
     
  14. gaz1

    gaz1 Member

    Messages:
    7,250
    Location:
    westyorkshire
    This done with a 9" grinder

    depth 1/2" to 3/4" in places the run down goes deeper so nite that

    the groove can be widened by a slight twist of grinder

    this was done to water blow through under rubber of door seal


    20190306_102933.jpg 20190306_102951.jpg
     
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  15. nickk Member

    Messages:
    1,679
    Location:
    Hay-on-wye
    I have a similar patch with that problem,only mines a few inches !
    More to do with inadequate sub base that’s moved/ settled differently to surround.
     
  16. fixerupper

    fixerupper Member

    Messages:
    1,410
    Location:
    Crete Greece
    Yeah,cut a slot with a stone cutting disc in an angry grinder.Make it V shape of to the nearest edge Either that or fill the depression with a Sharpe sand and cement mix with polymer additive...
     
  17. scottmk1

    scottmk1 Forum Supporter

    Messages:
    780
    Location:
    Scotland
    Ok thanks for the replies and suggestions, if grinding is expensive I'll leave that idea alone and sort out a drainage channel in the deepest part.
     
  18. slim_boy_fat

    slim_boy_fat Forum Supporter

    Those are 'interesting' looking tyres.
     
  19. roofman

    roofman Purveyor of fine English buckets and mops

    Messages:
    6,037
    Location:
    North West
    Von Arx...i have just sold my last one as we use them for cleaning flat roofs. you can hire them at some outlets and they will do the job is 10 mins;)
    upload_2019-5-16_21-44-33.jpeg
     
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  20. gaz1

    gaz1 Member

    Messages:
    7,250
    Location:
    westyorkshire
    yeah there landy tyres goodyears i think
     
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