Advantages of epoxy vs cement concrete cnc?


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    Default Advantages of epoxy vs cement concrete cnc?

    Hi all,

    Sorry for asking the same question over: what are the advantages of epoxy over cement concrete? I understand that cement takes a long time to cure.
    However, as I understand, epoxy/cement concrete are just fillers. Their main purpose is to give weight, and dampen the vibrations? The main structure of the concrete CNC is still the steel frame inside?
    So it doesn't matter whether the normal cement takes a long time to cure or not?

    Thanks!

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    Default Re: Advantages of epoxy vs cement concrete cnc?

    Im building a machine out of high grade concrete. For me, it was mainly the cost that made me consider concrete versus epoxy. I was also concerned with all the various epoxy options which confused me.

    I have a thread on here with my build. Some have been critical of some of the methods used but feel free to review / ask questions.



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    Default Re: Advantages of epoxy vs cement concrete cnc?

    Concrete fails under tension, it is ONLY strong under compression. Also EG will have a much better dampening effect on vibrations.

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    Default Re: Advantages of epoxy vs cement concrete cnc?

    Thanks Chazaxl and Mcphill!!!

    So I understand the better the dampening effect the epoxy is and the advantage of concrete/epoxy regarding compression. However, I still can't imagine how the tension effect affect the concrete cnc vs epoxy cnc, may you elaborate more?

    BTW Chazaxl, I can't find your thread?

    Last edited by foreveryoung; 07-06-2016 at 12:06 PM.


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    Default Re: Advantages of epoxy vs cement concrete cnc?

    Quote Originally Posted by foreveryoung View Post
    BTW Chazaxl, I can't find your thread?
    http://www.cnczone.com/forums/vertic...5332-thor.html

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    Default Re: Advantages of epoxy vs cement concrete cnc?

    The main reason to use epoxy is stability. Cement is forever drying and gaining strength 20+ years and its still drying. There is also significant creep long term in cement based concrete.

    Cement and epoxy are binders. Fillers are stone sand and aggragates. Most of the strength comes from compression of the concrete and aggragate interlocking/packing.Steel is used to take up the tension in concrete as you can assume tension strength of concrete is zero. Steel should be put in tension sections of the structure. Or build big enough that steel isn't required. Epoxy concrete is 2-3x stronger 90mpa in (compression) than standard cement based concrete 30mpa. The cost is around $2-3/kg and a lot of labour. Its a waste of time to spend all that time building moulds and pouring the mould to use a slightly cheaper product that will be 10x worse.



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    Default Re: Advantages of epoxy vs cement concrete cnc?

    Thanks MCPHill & Charlie!!



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Advantages of epoxy vs cement concrete cnc?

Advantages of epoxy vs cement concrete cnc?