concrete mix

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noshed

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concrete mix
« on: February 06, 2008, 16:02 »
I have to build a concrete slab 10'x8'2", 3-4" thick. How do I calculate how many bags of cement, gravel whatever to buy. (It's for the base for our famed allotment trading hut, which is now becoming a reality).
Self-sufficient in rasberries and bindweed. Slug pellets can be handy.

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Sally A

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concrete mix
« Reply #1 on: February 06, 2008, 16:06 »

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Ruth Cross

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concrete mix
« Reply #2 on: February 06, 2008, 16:12 »
As a quantity surveyor this is my dream question, sad I know;
 you'll need total of 0.66m3 concrete (for slab 3.5inches thick), the amount of bags of material you will need depends on the mix you want; coarse, fine etc.

I'm sure the builders merchant or the info on the bag will tell you how many you need to make up the quant with the mix you require :wink: Hope that helps

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Sally A

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concrete mix
« Reply #3 on: February 06, 2008, 16:14 »
Ruth, it sort of shows you've been waiting since the 5th Oct 2007 for that one to come up :lol:

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Ruth Cross

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concrete mix
« Reply #4 on: February 06, 2008, 16:15 »
OHHH YESSSSSSSSSS :lol:  :lol:  :lol:

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David.

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concrete mix
« Reply #5 on: February 06, 2008, 19:31 »
As a retired Quantity Surveyor, the above estimate is correct if the concrete is being spread on a dpm or sand/etc. fully blinded hardcore base, but more would be required if poured onto an open hardcore base.

I always used the guides in the front of commercial pricing handbooks , such as 'Spons' & 'Laxtons' from the office library, rather than info. from builders merchants.

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poultrygeist

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concrete mix
« Reply #6 on: February 06, 2008, 20:55 »
Quote from: "Sally A"
think I googled for the concretecalculator

try this one


http://www.practicaldiy.com/general_building/concrete_calculators/concrete_calculator_2_m.php#paving


I used this site for material calcs when I laid some strip foundations recently and it was pretty accurate. I've got 2 bags of ballast left over.
Best of luck with the slab.
Rob

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noshed

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concrete mix
« Reply #7 on: February 06, 2008, 22:53 »
Thanks chaps, much appreciated

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noshed

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« Reply #8 on: February 08, 2008, 15:58 »
I think my head has just exploded. The shed co reckon a base 305x247cm, say 10cm deep = 753350cm3 = .75m3?
My decimal points may have gone awry.

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noshed

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concrete mix
« Reply #9 on: February 08, 2008, 16:01 »
This seems to need 8  50kg bags of cement and a cubic meter of ballast - any idea how much this would cost (very roughly). Sorry about this I have to speak to some old Italians tomorrow.

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poultrygeist

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concrete mix
« Reply #10 on: February 08, 2008, 16:42 »
Using Wickes prices it's about £3/bag for a bulk order of 25kg bags.

Might get a better deal delivered from a builders merchant.

Jumbo bag of ballast which is, I think, about 700 or 800kgs about £35-£40 delivered.

Might be worth hiring a small mixer for the day/weekend.

Speeds the job up no end.

Best of luck.
Rob

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noshed

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concrete mix
« Reply #11 on: February 08, 2008, 23:07 »
Excellent, thanks a lot

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Tinbasher

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« Reply #12 on: February 09, 2008, 00:57 »
Quote from: "noshed"
I think my head has just exploded. The shed co reckon a base 305x247cm, say 10cm deep = 753350cm3 = .75m3?
My decimal points may have gone awry.



Ten foot is more or less 3 metres (3050mm more precisely) and 8 foot is more or less 2.5 metres, so that's 7.5 metres squared.  Four inches is 100mm (ie a tenth of a metre) so the answer is 7.5 times 1/10 = 0.75 cubic metres.

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noshed

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concrete mix
« Reply #13 on: February 09, 2008, 11:00 »
I am a mathematical genius after all. thanks

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noshed

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« Reply #14 on: February 09, 2008, 20:43 »
It has all gone well - £66! And a lovely flat thingy



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