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how much concrete do I need?

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  • 07-10-2009 7:48pm
    #1
    CamperMan
    Registered Users Posts: 1,835 ✭✭✭


    OK, I need concrete for 4 foundations, each one measures 60cm x 60cm square and 80cm deep, how much concrete would I need??

    Thanks


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    #2
    muffler
    Registered Users Posts: 45,921 ✭✭✭✭muffler


    0.6 x 0.6 x 0.8 = 0.288 x 4 = 1.152 m3


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    #3
    Poor Uncle Tom
    Registered Users Posts: 14,547 ✭✭✭✭Poor Uncle Tom


    4No. x (0.6m x 0.6m x 0.8m) + 10% = 1.3m3


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    #4
    CamperMan
    Registered Users Posts: 1,835 ✭✭✭CamperMan


    thanks... you guys are fast, 1.152 m3, is it worth getting ready mixed concrete for such a small job, or just get bags of cement, some sand, some stones and mix it myself?


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    #5
    CamperMan
    Registered Users Posts: 1,835 ✭✭✭CamperMan


    putting a wind turbine up, and it requires the sizes I mentioned for each footing, what mix would be best for this.... the holes after digging them out, is soft clay with water seeping up from below..


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    #6
    gman2k
    Registered Users Posts: 4,076 ✭✭✭gman2k


    For wind turbine, make sure the sides of the founds are perfectly vertical, not anyway sloped back. the forces from the turbine are different from standard constructs, and can work the founds loose if they are dug 'v' shaped.


    Can't help you re the strength


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    #7
    bbam
    Closed Accounts Posts: 7,410 ✭✭✭bbam


    CamperMan wrote: »
    soft clay with water seeping up from below..

    Are you sure your footing is good enough?? Concrete is only as good as the ground it's poured into..
    You should really be down onto some decent hard subsoil for a sound job... I'd imagine anyway, how big is the turbine??


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    #8
    starbelgrade
    Closed Accounts Posts: 20,739 ✭✭✭✭starbelgrade


    CamperMan wrote: »
    thanks... you guys are fast, 1.152 m3, is it worth getting ready mixed concrete for such a small job, or just get bags of cement, some sand, some stones and mix it myself?

    Mixing it yourself would be a lot cheaper. Most concrete suppliers only deliver a minimum of 5m3. Also, by mixing what you need as you go along, you won't be left with any waste or be under pressure to get the job done before the concrete sets or the rain starts.


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    #9
    CamperMan
    Registered Users Posts: 1,835 ✭✭✭CamperMan


    bbam wrote: »
    Are you sure your footing is good enough?? Concrete is only as good as the ground it's poured into..
    You should really be down onto some decent hard subsoil for a sound job... I'd imagine anyway, how big is the turbine??

    it's a smallish 1kw, on 6m tower,


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