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 Post subject: Fixing Concreted slabs
PostPosted: Mon Apr 16, 2018 7:28 pm 
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We have issues with a poured concrete patio as few slabs are sinked.

It seems patio was build by pouring concrete with clear separtion/divider.

I managed to remove the slabs/section of the patio where we have sinking problem.

I have compacted the area and put MOT type 1 so all area is level and solid.

The back of poured concreted slab/section is not even. I tried to remove old hardcodre sticked to it.

Could I just put mix sand and cement and and use unveven back faced slabs ?

My busdget is low and do not wanted to spend on new slabs/patio.

Thanks for all help


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PostPosted: Tue Apr 17, 2018 7:53 pm 
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why not put a photo up?
what you call slabs, do you mean concrete flags?
is the patio uncovered and exposed to the weather?


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PostPosted: Tue Apr 17, 2018 8:33 pm 
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PostPosted: Tue Apr 17, 2018 8:34 pm 
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I attached pics?


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PostPosted: Tue Apr 17, 2018 9:13 pm 
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i dont see any evidance of poured concrete.

anyhow, lift the soft or sinking flags and dig outabout 100mm to 150mm deep. then tamp down hard the



stones and sand and small rubble and a little cement powder. .

cover with a bed of sand and mix sand and cement semi-dry at 3:1 and slap down about 5 dabs.
drop the flags onto the dabs.
they should be proud. carefully tamp the flags down level two ways.
then leave them to set up


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PostPosted: Tue Apr 17, 2018 9:30 pm 
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okay thanks....

sorry im no expert... just wanted to fix the patio

how much water should i use in 3:1 sand to cement ratio?


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PostPosted: Tue Apr 17, 2018 10:47 pm 
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mane1034 wrote:

how much water should i use in 3:1 sand to cement ratio?


For a *semi-dry mix* you need to add enough water so that the mix will just hold together when a handful is squeezed together and will crumble again if you disturb it.

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