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Concrete base

Discussion in 'Building' started by HERTS P&D, 17 May 2021.

  1. HERTS P&D

    HERTS P&D

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    Hi Guys.

    I need to build a concrete base with the sizes being 2ft wide x 10ft long and 4-6" deep.

    How many bags of 25kg ballast do I need?

    Andy
     
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  3. SFK

    SFK

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    https://www.concretenetwork.com/concrete/howmuch/calculator.htm

    says >>

    2ft x 10ft x 6" = 35 x "40lb bags" of "cement + ballast"
    = 35 x 18kg of "cement + ballast"
    = 635kg of "cement + ballast"
    = 26 x 25kg bags of "cement + ballast"

    Mixing 1 part cement to 6 parts ballast creates concrete suitable for driveways, paths and patios,

    so at that ratio

    3.5:21 = 24.5 = 3.5 cement and 21 balast for slightly less than 6inches

    Checksum:
    (3.5x25kg)+(21x25kg) =
    87.5 + 525 =
    612.5kg when you need 635kg for 6inches

    I always end up short so I would get
    4:24 = 28 = 4 cement and 24 balast for more than 6inches
     
    Last edited: 17 May 2021
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