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 Post subject: Concrete slab - DIY help
PostPosted: Sun Apr 15, 2018 10:42 pm 
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Firstly, please excuse my complete lack of knowledge on this but am just a simple DIYer! I’m happy doing plastering, stud walls etc but this is new to me!

Am needing to lay a concrete slab of which I need to use to store 2 47kg gas cylinders (in a cage). Am looking at laying a 120 x 60 x 15cm slab. I’ll be perfectly fine doing the job but it’s the ratios of what I need I can’t get my head around.

I’ve worked it out as a 0.11 cubic meter slab. How many bags of cement, sand and gravel do I need to do this (if this is the right mix)?


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PostPosted: Sun Apr 15, 2018 11:15 pm 
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After more googling I’ve found my answer I think. 1 part cement 5 parts ballast

So by my calculations that’s 2 bags cement and 10 bags ballast...


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PostPosted: Mon Apr 16, 2018 7:55 am 
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You need to think in volume not weight!
If you wish to produce a 1: 5 Cement : Balast : mix then you need to have used the same gauging measure for each component.
So lets presume you have made a gauging box with an internal measurement of 20cm x 20cm 20cm (80 cubic cm)
Therefore one batch of 1 Cement : 5 Balast = 6 x 80 = 480 cubic cm.
Your slab is 120cm x 60cm x 15cm = 108000 cubic cm's
divided by 480 cubic cm's gives you 225 Batches.
So make yourself a gauging box and do a test run with one bag of balast to determine how many bags you need!
Buying by the bag is often expensive. You may want to check out the price of a tonne bag,

Davyp1


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PostPosted: Mon Apr 16, 2018 1:48 pm 
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I think your estimates are in the right ball-park for the slab you intend (depending on how big the bags are of course) - IMO around 200kg of ballast.

As mentioned by davyp1 though, this is 'just an estimate' and depends on the density of the ballast, which can vary. But it should be close enough to decide roughly what type of packaging you want to buy it in. If you are unsure, another approach may be to buy from somewhere that takes unopened bags back.

Thats a nice thick slab. You will still need to remove any organic stuff and top soil, of course. If the sub-grade is firm you could get away (IMO) with pouring directly on top for a small job like this. But if not (or if too low) then consider a base of something like MOT 1.

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PostPosted: Mon Apr 16, 2018 3:52 pm 
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Thanks for the replies guys. Much appreciated! Hopefully have managed to convince a builder friend to give me a hand now too!


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PostPosted: Mon Apr 16, 2018 7:02 pm 
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https://source4me.co.uk/calculate_concrete_mix.php

Calculates volume, and bags needed, either ballast or sand/gravel


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