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  1. #221
    Senior Member Rank = Hassai Steve1984's Avatar
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    Thanks so one layer of rebar in the slab and use off cuts around the pipework etc. I take it the rebar goes above the pipework rathe than under the pipework for the main slab or do I cut around the pipework as well as the BD to the the rebar placed half way through the slab. Il make sure the pipework is sanded to give a clean edge and a key for the adhesive to stick too. The ground is solid so the base will have something good to sit on and I'll get some bricks to rest the rebar on for when the slab gets poured.

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  3. #222
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    Thats it Steve,i would cut out the pipe and drain channel on the rebar mesh so it sits midway in the slab along with the pipe and drain than use the off cutts to strenghten round the pipe work,use an angle grinder and goggles to cut it.
    John

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  5. #223
    Moderator Rank = Supreme Champion Feline's Avatar
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    Quote Originally Posted by Steve1984 View Post
    Thanks so one layer of rebar in the slab and use off cuts around the pipework etc. I take it the rebar goes above the pipework rathe than under the pipework for the main slab or do I cut around the pipework as well as the BD to the the rebar placed half way through the slab. Il make sure the pipework is sanded to give a clean edge and a key for the adhesive to stick too. The ground is solid so the base will have something good to sit on and I'll get some bricks to rest the rebar on for when the slab gets poured.
    I would avoid cutting the rebar where the 4" pipe runs- that is the bit of the slab most in need of reinforcement. It is easier to fit the rebar below the pipes than it is above it, simply because there is not much room above the pipe and your rebar could end up too close to the surface to be as strong as it could be. I would put the sheet below, then you can tie in offcuts above the pipes too if you wanted to. I did that on mine, although the extra bit above is certainly not essential.

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  7. #224
    Senior Member Rank = Hassai Steve1984's Avatar
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    thanks again, hopefully by the end of the weekend I'll have some progress pictures to post up. wont be much progress but hopfully the pipework drains and rebar will be in with any luck. I take it it's still ok to have the slab laid this time of year even with the rain that we usually get. I'll try and look for a dry day but I need to tie the delivery in with my brothers rota so that he can help me barrow the cement across.

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  9. #225
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    You could try as Feline said,go under the pipe work,do a dry test first and maybe tie some wire to the rebar one side of the pipe over the pipe and tie to the rebar on the other side of the pipe with bricks underneath to support,you have to think you will be tramping over the mesh when leveling so has to be sturdy.
    John

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  11. #226
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Good point that john tramping and walking on the mesh

    Sent from my SM-G925F using Tapatalk

  12. #227
    Senior Member Rank = Hassai Steve1984's Avatar
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    most of me is excited to get this next step in and sorted, part of me is worried about it in case I do it wrong and mess things up, quite worries about putting the bricks under the rebar in case the bricks move and the rebar falls casuing any damage to anything.

  13. #228
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Quote Originally Posted by Steve1984 View Post
    thanks again, hopefully by the end of the weekend I'll have some progress pictures to post up. wont be much progress but hopfully the pipework drains and rebar will be in with any luck. I take it it's still ok to have the slab laid this time of year even with the rain that we usually get. I'll try and look for a dry day but I need to tie the delivery in with my brothers rota so that he can help me barrow the cement across.
    this was mine with rain last year
    15f.jpg
    still went off ok fiber glassed after that once dried out. that was a half hour later.

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  15. #229
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Quote Originally Posted by Steve1984 View Post
    thanks again, hopefully by the end of the weekend I'll have some progress pictures to post up. wont be much progress but hopfully the pipework drains and rebar will be in with any luck. I take it it's still ok to have the slab laid this time of year even with the rain that we usually get. I'll try and look for a dry day but I need to tie the delivery in with my brothers rota so that he can help me barrow the cement across.
    this was mine with rain last year 1\3 up block
    15f.jpg
    still went off ok fiber glassed after that once dried out. that was a half hour later.

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  17. #230
    Senior Member Rank = Hassai Steve1984's Avatar
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    thanks wasn't sure if the extra water from the rain would make it too wet and stop it going off. i'll still plan for a dry day but hopefully if it does rain it will still be ok.

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  19. #231
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Quote Originally Posted by Steve1984 View Post
    thanks wasn't sure if the extra water from the rain would make it too wet and stop it going off. i'll still plan for a dry day but hopefully if it does rain it will still be ok.
    obviously it needs to be dry steve. but it just goes to show .how it can go off. i was flapping like hell for about 4 day s. ha ha. i thought it was done for. and would have to be done again.
    that was snow as well. blocks where put on that about 3 to 4 days later. just goes to show. how tough concrete is. i would nt like to go through that again though. 14 to 15 months been built now. and still ok
    and hopefully lasts forever.

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  21. #232
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    forgot to add we had to keep pumping water off. the slab so it could dry mate. did nt just leave it to dry. just put a pump in bottom drain and sucked it out

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  23. #233
    Senior Member Rank = Hassai Steve1984's Avatar
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    ah ok, I totally misunderstood that. worst case I've got a gazeebo which ill have to put up is it rains and try to let the slab dry as much as possible under that. I've got a bilge pump that I use to collect sea water so I can use that to pump the water out of the hole when it starts to fill up over the winter

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  25. #234
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    Dont worry Steve,once it starts to go off concrete will set even under water.

    The important bit is keeping the drain and pipe work from moving while you pour the concrete,get that nice and firm and your good to go.
    John

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  27. #235
    Senior Member Rank = Hassai Steve1984's Avatar
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    thanks john, its worrying going into the unknown, but its also good to see that I can ask questions on here and get some good advice too. I'm aiming to get the pipework/BD in and set over the weekend and also get the rebar in as well. I've got a busy week next week and am away the following week so the earliest I can plan on getting the cement delivered for the slab will be the 1st week of November which is not ideal. once that goes off I can order the sand and blocks to start building the walls I'm sure I'll be back asking more questions then.

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  29. #236
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    Ask away Steve no problem,we can only advise on our past experiences and mistakes we made,its all a learning curve.

    Once the slabs down it soon goes up and you start to see results.
    John

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  31. #237
    Senior Member Rank = Hassai Steve1984's Avatar
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    Can't do the pipework and BD this weekend now the pipe for the airline that was ordered was the wrong size so now I have to wait for a reducer to be ordered so that it can all be fitted together that's my whole weekends worth of plans gone up in smoke and another setback I could have done without

  32. #238
    Senior Member Rank = Nanasai Gray's Avatar
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    With my slab I purposely watered it every night for around 4 days to keep it damp. I put sheets over it to keep the water content in there. The slower it goes off the better. Once it’s dry throughout then the cure is finished. If you can keep the cure process going for a few days then it will be stronger when compete.

    It rained hard one night and for once I was actually pleased for it! Saved me watering the concrete Steves 1st pond build

    As John1 said, concrete will go off under water so in this case rain is your friend.

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  34. #239
    Senior Member Rank = Hassai Steve1984's Avatar
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    Ok thanks maybe I'll worry less about it then

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  36. #240
    Senior Member Rank = Nanasai Handy Kenny's Avatar
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    Steve, If you check out a few of the big pond builds on Youtube you will find that the pipework is often laid in a channel which ostensibly is below the bottom level of the finished slab and the reinforcing mesh then goes from side to side and across the top of the pipe - no cuts etc. The piping channel is filled in with concrete as the base is laid. This would give you the strongest structure as the depth of the concrete will be the same across the structure but deeper around the pipe. If you run say a 4 inch pipe through a 6 inch depth of concrete the weakest point will be above and below the pipe.

    I laid my 4 inch bottom drain pipe in a channel which was supposed to be 8 inches wide (but got a little wider in places) and 6 inches deep The channel stretches along 95 percent of the pond length (30 feet) and instead of being a point of failure adds strength, a bit like a back bone. The concrete on top of that is then only 4 inches deep across the whole structure. I didn't want to use reinforcing mesh since my pond is more organically shaped i.e. a bit like a chinese soup spoon which gives it lots of strength, so I used 2 inch plastic needles and two of us mixed and hand applied 8 tons of basic mix concrete (not especially strong) with added plasticiser/waterproofer (which makes it stronger) to achieve the round shaping. Then painted it after pressure washing to remove any dust etc. 20,000 litres of water so around 20 tons of weight. Had no issues in two years of completion and don't expect any. Concrete when it is accurately mixed in the right proportions is incredibly strong, they used to build bomb shelters out of it.

    As Gray has said you don't want it to cure too quickly so damp weather is good and if you think it is too dry (curing too quickly) then spray some water on it in the first few days.

    Kenny
    Last edited by Handy Kenny; 14-10-2017 at 02:20 AM.

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