How long for slab curing?

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Mike61

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#231986 24-Mar-2018 08:03

Hi all

I'm pouring a 3.6 x 3 concrete slab on Thursday for a storage shed. How long should I wait before dynabolting timber framing to it?

Also how far away should I keep the reinforcing mesh from the edge of the pad?

Cheers

antoniosk

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#1982425 24-Mar-2018 08:27

Im not even a novice, but I've seen quite a few slabs poured in the last few years. The steel seems to be about 50-75mm from the edges. Slabs seem to take 2-4 days to cure depending on air temparature and how wet they are kept. My neighbours is enormous (12m x 8m x .5) and took 6 days of constant watering in November 16 before the builders came back on.

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froob

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#1982427 24-Mar-2018 08:34

Mitre10 guy says 48 hours to cure: https://www.mitre10.co.nz/guides-and-advice/guide/how-to-lay-a-concrete-pad

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froob

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#1982432 24-Mar-2018 09:03

This document (if I understand it correctly) says the NZS 3604 concrete cover requirements are 75mm away from the ground, 50mm away from edges above ground against formwork, and 30mm away from a covered top of a slab.

Of course, NZS 3604 is not for shed building, so possibly less would be fine - I'm by no means an expert.

I used anchor screws rather than dynabolts when doing some repairs on our shed. I think they have less chance of exploding the edges of the slab.

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BlinkyBill

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#1982446 24-Mar-2018 09:47

Disappointed, thought this was about bacon.

Mike61

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#1982525 24-Mar-2018 12:25

Cheers, think I'll leave it a week as I'll then have 4 days for the framing.

I'll check out anchor screws as well.

And mmm bacon, time for lunch.

Cheers again

Fred99

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#1982598 24-Mar-2018 17:30

7 days should be pretty good IMO.

Those concrete screws are great - though you'll end up with a sore arm if you're driving lots of them in by hand (ie with a ratchet). I use an 18v battery rattle gun - which IIRC is something like 800 ft/lb, so will drive 10mm or larger anchors. Standard 18v impact driver manages 6.5mm anchors for small fixings. Ideally you'll need a small compressor with an air-gun too - to blow out the holes, though I've had some success with a garden blower.

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Mike61

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#1983808 26-Mar-2018 20:46

My impact driver is no where near that powerful so it looks like it may be down to a ratchet. I need to build my muscles up so it will be good exercise.