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Rebar in concrete slab.
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Nick



Joined: 02 Nov 2004
Posts: 34535
Location: Hereford
PostPosted: Wed Jun 29, 11 11:37 am    Post subject: Rebar in concrete slab. Reply with quote
    

I'm laying a concrete slab, and the guide I have suggests incorporating rebar for strength. I can't easily get hold of any rebar, or similar, but I do have stock netting. Would this help, or do I need the thickness of 10mm rebar?

sean
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 42207
Location: North Devon
PostPosted: Wed Jun 29, 11 11:43 am    Post subject: Reply with quote
    

I don't know. But concrete's good in compression and rubbish in tension isn't it? So incorporating something stretchy isn't really going to help all that much. I think.
Feel free to wait for an answer from someone who knows what they're talking about. Even though that's contrary to the best traditions of the internet.

Nick



Joined: 02 Nov 2004
Posts: 34535
Location: Hereford
PostPosted: Wed Jun 29, 11 11:47 am    Post subject: Reply with quote
    

That confirms what I thought. Arse.

vegplot



Joined: 19 Apr 2007
Posts: 21301
Location: Bethesda, Gwynedd
PostPosted: Wed Jun 29, 11 12:11 pm    Post subject: Reply with quote
    

It will depend (as usual) on the load the slab is carrying. You can get away with no re-enforcement if the loading is light such as a shed, netting will add a little extra strength but not a lot.

Credentials: I used to work for Redland (now LaFarge) in their cement research labs at Graylands, we worked on fibre reinforced cement products.

Nick



Joined: 02 Nov 2004
Posts: 34535
Location: Hereford
PostPosted: Wed Jun 29, 11 12:18 pm    Post subject: Reply with quote
    

Rebar it is then. Thanks.

Dee J



Joined: 22 May 2005
Posts: 342
Location: West Devon
PostPosted: Wed Jun 29, 11 3:10 pm    Post subject: Reply with quote
    

Our local Travis Perkins builders merchants sell rebar pre-welded into a 4" grid pattern. Not expensive (though I can't remember how much).. used a couple of sheets in our extension build and the floor is still up there

Dee

Nick



Joined: 02 Nov 2004
Posts: 34535
Location: Hereford
PostPosted: Wed Jun 29, 11 3:16 pm    Post subject: Reply with quote
    

Aha! We have one of those. Local builders' merchant looked blankly at me. Which is odd, they're usually very good. Is it called something else, too?

Dee J



Joined: 22 May 2005
Posts: 342
Location: West Devon
PostPosted: Wed Jun 29, 11 3:24 pm    Post subject: Reply with quote
    

Questioning my own sanity now...... we bought some other steel products (girders etc) from this bunch...

www.dyfedsteel.co.uk/

maybe we got the grid there...

Dee

crofter



Joined: 11 Feb 2007
Posts: 2252

PostPosted: Wed Jun 29, 11 3:24 pm    Post subject: Reply with quote
    

Nick wrote:
Aha! We have one of those. Local builders' merchant looked blankly at me. Which is odd, they're usually very good. Is it called something else, too?


Mesh.

mochyn



Joined: 21 Dec 2004
Posts: 24585
Location: mid-Wales
PostPosted: Wed Jun 29, 11 4:01 pm    Post subject: Reply with quote
    

vegplot wrote:
Credentials: I used to work for Redland (now LaFarge) in their cement research labs at Graylands, we worked on fibre reinforced cement products.


Ooh: so you must know all about slump factor.

vegplot



Joined: 19 Apr 2007
Posts: 21301
Location: Bethesda, Gwynedd
PostPosted: Wed Jun 29, 11 5:05 pm    Post subject: Reply with quote
    

mochyn wrote:
vegplot wrote:
Credentials: I used to work for Redland (now LaFarge) in their cement research labs at Graylands, we worked on fibre reinforced cement products.


Ooh: so you must know all about slump factor.


Nah. I worked in polymer cements and dabbled in phenolic resin roofing slates. Didn't touch aggregates. I know about the slump test but not a great deal.

mochyn



Joined: 21 Dec 2004
Posts: 24585
Location: mid-Wales
PostPosted: Wed Jun 29, 11 5:31 pm    Post subject: Reply with quote
    

You're still the only person I know who has heard of it, though!

kirstyfern



Joined: 03 Jan 2010
Posts: 1574
Location: Great Dunmow, Essex
PostPosted: Wed Jun 29, 11 5:52 pm    Post subject: Reply with quote
    

I saw sheets of the 'concrete reinforcing mesh' in Travis Perkins today. I have it under my stable base - 8" thick fibre re-inforced sulphur resistant concrete - I went a bit OTT, LOL! 11 years on and not a single crack, even the tamping marks are still there!

HenX



Joined: 27 Apr 2009
Posts: 1459
Location: Forest of Dean
PostPosted: Wed Jun 29, 11 8:33 pm    Post subject: Reply with quote
    

Depending on what the slab is for you'll need either a square mesh or a rectangular mesh (square carries load better in 2 directions, rectangular in one).

Acorns



Joined: 07 Jun 2009
Posts: 30
Location: Nottinghamshire
PostPosted: Thu Jun 30, 11 8:19 pm    Post subject: Reply with quote
    

If it's going to be driven on us the square mess, fill the area with concrete then drop the mess in and walk on it to make it sink.
I was a ground worker for many years and thats how we did it.

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