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Thread: Vibrating concrete screed - GIF

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    Vibrating concrete screed - GIF


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    Is this a gas powered weed wacker with an eccentric spinning weight? The power head is hidden by his coat and belly.

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    Quote Originally Posted by metric_taper View Post
    Is this a gas powered weed wacker with an eccentric spinning weight?
    I think you nailed it. That's exactly what it looks like.

    Also there's way too much water in that mix.

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    Quote Originally Posted by nova_robotics View Post
    I think you nailed it. That's exactly what it looks like.

    Also there's way too much water in that mix.
    What is the result/consequence of too much water?

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    Quote Originally Posted by Gadgeteer View Post
    What is the result/consequence of too much water?
    Everything gets worse. Lower strength. All the aggregate settles out to the bottom. Prone to cracking. I think it screws up aeration too (which is super important with concrete). Just generally results in junk. A soupy mess like that is the mark of a bad contractor.

    The ideal concrete mix, for maximum strength, is so dry you'd probably never want to use it. You have to add a bit more water than that just for it to be workable. And paradoxically once it sets up you want to keep the concrete as wet as possible while it cures. Concrete is weird.

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    In the very beginning of the video you can see the gas tank of the power head
    Agreed there is way too much water in the mix, I've seen thicker mixes come out of a pumper hose
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    Supporting Member mwmkravchenko's Avatar
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    Quote Originally Posted by nova_robotics View Post
    Everything gets worse. Lower strength. All the aggregate settles out to the bottom. Prone to cracking. I think it screws up aeration too (which is super important with concrete). Just generally results in junk. A soupy mess like that is the mark of a bad contractor.

    The ideal concrete mix, for maximum strength, is so dry you'd probably never want to use it. You have to add a bit more water than that just for it to be workable. And paradoxically once it sets up you want to keep the concrete as wet as possible while it cures. Concrete is weird.
    Flow agent is your friend. Water your enemy. If you have the right flow agent is is super easy to work and yet will be as strong as it can be.



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