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Builders mathmaticians help?

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ginasmg
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2011/03/31 20:14:35 (permalink)
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Builders mathmaticians help?

I am doing a project at the moment for a friend (old lady accross th road) she wants me to put a garden shed up for her with a concrete base.
 
Now my hole size is 8ftx6ft depth 3 inches, my question is how many bags of cement should i buy at 25kgs to fill in 3 inches at 8ftx6ft?
 
I have already done the other 3 inches base hardcore.
 
 
 
 

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37 Replies Related Threads

    Paracelsus
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    Re:Builders mathmaticians help? 2011/03/31 20:32:58 (permalink)
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    We need to know the volume of cement per kg, you're comparing volume and mass there
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    dazc
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    Re:Builders mathmaticians help? 2011/03/31 20:33:13 (permalink)
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    work out the cubic meterage, then x that by 1.8, and thats roughly the weight you need in dry material.  divide by whatever mix your doing it,  which gives you cement weight needed, the rest you need in mixed aggreagate.
     
    id work it out for you, but you have given the sizes in old money.  i work in metric... lol
    #3
    ginasmg
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    Re:Builders mathmaticians help? 2011/03/31 20:37:46 (permalink)
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    The bags of cement are 25kgs but i dont know what the coverage is,  sory im working in old money lol.i cant get used to this metric stuff even now.
     
    I rang wicks and they said 3 bags lol,no way are 3 bags going to fill a hole 8ftby6ft by 3 inch deep.

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    dazc
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    Re:Builders mathmaticians help? 2011/03/31 20:39:17 (permalink)
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    dont need to know the coverage! i gave the conversion ratio in my post!
     
    cubic meters (simple volume calc!)  x1.8 gets you the weight needed in KG!
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    ginasmg
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    Re:Builders mathmaticians help? 2011/03/31 20:45:08 (permalink)
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    Thanks dazc, i dont know how to work out the cubic meterage though, sory im not good with figures.

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    dazc
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    Re:Builders mathmaticians help? 2011/03/31 21:33:28 (permalink)
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    length x width x depth in meters
     
    i would do it for you, but i dont know the conversion from feet to meters accurately enough
    #7
    All4n
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    Re:Builders mathmaticians help? 2011/03/31 21:58:16 (permalink)
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    1ft = 12 inches
    1 inch = 0.025m
     
    so 2.4m x 1.8m x 0.075m = 0.324m^3?
     
    so 0.324 x 1.8 = 0.583
     
    Not sure what units of weight that is supposed to work out in tho?
    #8
    dazc
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    Re:Builders mathmaticians help? 2011/03/31 22:06:45 (permalink)
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    looks about right to me, so about 0.6 tons of material
     
    if you are getting it in 25kg bags, then about 24 bags, maybe a few more, because IMO they never seem to be quite 25kg... 
    #9
    ginasmg
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    Re:Builders mathmaticians help? 2011/03/31 22:21:26 (permalink)
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    Thanks for all your help guys,very much appresiated i will buy 25 bags.

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    All4n
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    Re:Builders mathmaticians help? 2011/03/31 22:23:48 (permalink)
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    Just don't blame us if you're left with a half filled hole or a **** load of spare cement! Actually you can blame dazc, that's fine lol
    #11
    ginasmg
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    Re:Builders mathmaticians help? 2011/03/31 22:50:24 (permalink)
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    LOL mate, somat going to go wrong.

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    #12
    dazc
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    Re:Builders mathmaticians help? 2011/03/31 22:53:56 (permalink)
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    youll be alright mate.  and if it does go wrong, well its not in your garden..... haha!
     
    wouldnt fancy mixing that much by hand though, hope you have borrowed or hired a cement mixer!
    #13
    ginasmg
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    Re:Builders mathmaticians help? 2011/03/31 22:56:35 (permalink)
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    Doing it by hand mate im afraid

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    rogerthedog
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    Re:Builders mathmaticians help? 2011/03/31 23:09:31 (permalink)
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    25 bags sounds a hell of a lot just for a shed base. I'm thinking more like 5!
    http://www.renovateforum.com/f211/bags-cement-per-m3-75884/
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    ginasmg
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    Re:Builders mathmaticians help? 2011/03/31 23:22:02 (permalink)
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    Im confused now,oh!dear.

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    rogerthedog
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    Re:Builders mathmaticians help? 2011/03/31 23:26:19 (permalink)
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    Just seems to me that a lot of your mix will be some sort of aggregate. When you're talkiing 'bags' are they bags of cement or bags of pre mixed aggregate and cement mix? You see that a lot for concreting posts into holes.
    #17
    ginasmg
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    Re:Builders mathmaticians help? 2011/03/31 23:29:43 (permalink)
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    Yes there pre mixed mate,aggregrate and cement, sory for the confusion guys.
     
    Its a sure way of knowing the mix is correct.25kg bags.
     
    The "just add water" ones.
    post edited by ginasmg - 2011/03/31 23:31:54

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    #18
    rogerthedog
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    Re:Builders mathmaticians help? 2011/04/01 00:06:41 (permalink)
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    That will take a lot of the work out - that's for sure. Ok, so my 5 now sounds a bit low :-)
    Would they allow you to return a couple of bags if you over estimate? If they would them it might be worth adding a few more bags. Bit of a worry that the store said 3 bags. Did you speak to a spotty yoof?
    #19
    Red_Alert
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    Re:Builders mathmaticians help? 2011/04/01 00:18:56 (permalink)
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    25 bags of cement?! Are you building a cathedral?

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    #20
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