Rebar in concrete slab.

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Rebar in concrete slab.
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Nick

Joined: 02 Nov 2004
Posts: 34535
Location: Hereford

Posted: Wed Jun 29, 11 11:37 am Post subject: Rebar in concrete slab.
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: 42219
Location: North Devon

Posted: Wed Jun 29, 11 11:43 am Post subject:
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

Posted: Wed Jun 29, 11 11:47 am Post subject:
That confirms what I thought. Arse.

vegplot

Joined: 19 Apr 2007
Posts: 21301
Location: Bethesda, Gwynedd

Posted: Wed Jun 29, 11 12:11 pm Post subject:
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

Posted: Wed Jun 29, 11 12:18 pm Post subject:
Rebar it is then. Thanks.

Dee J

Joined: 22 May 2005
Posts: 342
Location: West Devon

Posted: Wed Jun 29, 11 3:10 pm Post subject:
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

Posted: Wed Jun 29, 11 3:16 pm Post subject:
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

Posted: Wed Jun 29, 11 3:24 pm Post subject:
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

Posted: Wed Jun 29, 11 3:24 pm Post subject:

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

Posted: Wed Jun 29, 11 4:01 pm Post subject:

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

Posted: Wed Jun 29, 11 5:05 pm Post subject:

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

Posted: Wed Jun 29, 11 5:31 pm Post subject:
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

Posted: Wed Jun 29, 11 5:52 pm Post subject:
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

Posted: Wed Jun 29, 11 8:33 pm Post subject:
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

Posted: Thu Jun 30, 11 8:19 pm Post subject:
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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