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weight of wet concrete when it's dry?

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JohnOvManchester
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2006/07/08 01:25:39 (permalink)

weight of wet concrete when it's dry?

hi,

I am debating making my own oly diameter weights from concrete...
anyone know how to work out the weight of wet concrete when it's set.

Lets say I make a mould that fit's in 20kg of wet concrete... I leave it to set... what will it weigh?

Come on engineers... there must be some sort of formula you can share?

cheers!!!
#1

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    chickensticks
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    RE: weight of wet concrete when it's dry? 2006/07/08 01:41:57 (permalink)
    mass = density x volume

    Find the density of concrete and you can work out the volume mould u will need.

    sub
    #2
    JohnOvManchester
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    RE: weight of wet concrete when it's dry? 2006/07/08 01:51:22 (permalink)
    density of concrete is 2300 kg/m3

    so if I had 20kg wet in my mould... what would the set product weigh after water content has evaperated and stuff?
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    chickensticks
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    RE: weight of wet concrete when it's dry? 2006/07/08 11:49:39 (permalink)
    In terms of finding the density of concrete it depends on the ratio of concrete to water used. As ive never mixed concrete i dont know how much this is...

    Assuming the density is set concrete that you gave me:

    Volume = Mass / Density = 20Kg / 2300 Kg M-3 = 8695.6 cm3

    So you would need a mould that could take 8.7 litres of cement, isn't that enourmous?

    sub
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    bunnykilla
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    RE: weight of wet concrete when it's dry? 2006/07/08 12:03:28 (permalink)
    I think you're just going to have to experiment.

    Lets say you took 1kg of dry concrete mix and mixed it up with water, then allowed it set fully, wouldn't the end result weigh 1kg once all the water has evaporated from it?

    Surely the water doesn't stay in the concrete and add more weight to it, it would never set if it did.

    Phil
    #5
    bunnykilla
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    RE: weight of wet concrete when it's dry? 2006/07/08 12:04:54 (permalink)
    Biggest problem is going to the size of the plate, a 20kg disc of concrete will be huge

    Phil
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    Rafriki
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    RE: weight of wet concrete when it's dry? 2006/07/08 12:35:56 (permalink)
    John
    Steel has a density of 7850kg/m3 compare this to concrete at 2300.

    Steel is 3.5times more dense than concrete therefore to achieve a 20kg plate it would need to be the same diam as a 20kG steel plate and 3.5x thicker. Your OLY bar wouldn't hold enough to make it worthwhile.

    As you can buy 20kg plates for around £25-30 a pop i'd invest in the real thing rather than an unmanagable compromise.

    "You may be disappointed if you fail, but you are doomed if you don't try." - Beverly Sills

    "Only I can change my life. No one can do it for me." - Carol Burnett
    #7
    JohnOvManchester
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    RE: weight of wet concrete when it's dry? 2006/07/08 13:34:47 (permalink)

    ORIGINAL: bunnykilla

    I think you're just going to have to experiment.

    Lets say you took 1kg of dry concrete mix and mixed it up with water, then allowed it set fully, wouldn't the end result weigh 1kg once all the water has evaporated from it?

    Surely the water doesn't stay in the concrete and add more weight to it, it would never set if it did.

    Phil

    not sure... i thought someone might know, some of the water might be involved in the curing and the weight be kept
    #8
    Tenthghost
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    RE: weight of wet concrete when it's dry? 2006/07/08 13:37:45 (permalink)
    **** me this is getting technical

    Skill over Will
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    JohnOvManchester
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    RE: weight of wet concrete when it's dry? 2006/07/08 13:54:04 (permalink)
    ORIGINAL: Rafriki

    John
    Steel has a density of 7850kg/m3 compare this to concrete at 2300.

    Steel is 3.5times more dense than concrete therefore to achieve a 20kg plate it would need to be the same diam as a 20kG steel plate and 3.5x thicker.
    Or larger diameter and thicker
    As you can buy 20kg plates for around £25-30 a pop i'd invest in the real thing rather than an unmanagable compromise.
    but yeh, if they are 3.5 times less dense then you could only fit 120kg on the bar at oly plate sort of diameter... could go 3.5 times as big in diameter, then it's would be the same!!! LOL

    post edited by JohnOvManchester - 2006/07/08 13:55:35
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    Rafriki
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    RE: weight of wet concrete when it's dry? 2006/07/08 15:44:05 (permalink)
    You'd have to squat on stilts to get parallel.

    Still n0-one has come up with formula so your really closer now in finding a solution. Good luck in your quest and make sure you post some pics of the plates when cast.

    Also remember not to drop them as they will break May need to put some steel rebar inside.

    "You may be disappointed if you fail, but you are doomed if you don't try." - Beverly Sills

    "Only I can change my life. No one can do it for me." - Carol Burnett
    #11
    JohnOvManchester
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    RE: weight of wet concrete when it's dry? 2006/07/08 17:30:09 (permalink)
    I'll probably not bother...
    Best idea to use stuff like that make some sort of sling that you hooked over the bar.
    But then it would swing too much eh?

    Another scheme down the pan!!!
    #12
    Venom
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    RE: weight of wet concrete when it's dry? 2006/07/08 18:12:58 (permalink)
    LOL, you ain't related to McGyver are you mate..............
    #13
    JohnOvManchester
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    RE: weight of wet concrete when it's dry? 2006/07/08 21:40:03 (permalink)
    LOL yeah, exactly mate 2 cousins 2wice removed but I english, uglier and without the highly intelligentlessness and scientific knowledge!!!
    post edited by JohnOvManchester - 2006/07/08 21:41:32
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    JohnOvManchester
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    RE: weight of wet concrete when it's dry? 2006/07/08 21:40:59 (permalink)
    delete me
    post edited by JohnOvManchester - 2006/07/08 21:41:51
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    greg_rfc
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    RE: weight of wet concrete when it's dry? 2006/07/09 18:35:55 (permalink)
    Sub, that's impressive.
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