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Lightweight Concrete

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  • david s
    replied
    Re: Lightweight Concrete

    Originally posted by dmorgs View Post
    Okay then, clear enough I guess. What about the mix for the insulating layer?
    Vermicrete would be good for the insulating layer it doesn't need to be strong and won't be subjected to high heat.

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  • dmorgs
    replied
    Re: Lightweight Concrete

    Okay then, clear enough I guess. What about the mix for the insulating layer?

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  • Johnny the oven man
    replied
    Re: Lightweight Concrete

    1400c LW is 1050kg/m3, 41% alumina,42% silica,15% cement. I will chase up the content info for you. Product is from Sila. They also make Silalite LW100, which is 1000c rated and is 800kg/m3, this would also do the trick.

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  • david s
    replied
    Re: Lightweight Concrete

    Johnny,
    I had difficulty finding one. What was offered to me as a lightweight castable was almost as dense as the dense castable I use. What is the density and the name of the product you're suggesting?
    Al,
    Vermiculite is only good for 1100 C so it must be different aggregates if it's good for 1400C
    Last edited by david s; 11-10-2011, 02:33 PM.

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  • brickie in oz
    replied
    Re: Lightweight Concrete

    Originally posted by Johnny the oven man View Post
    Better of getting an insulating refractory castable, they do make a lightweight 1400c grade material. Not crumbly at all.
    Out of vermiculite?

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  • Johnny the oven man
    replied
    Re: Lightweight Concrete

    Better of getting an insulating refractory castable, they do make a lightweight 1400c grade material. Not crumbly at all.

    Leave a comment:


  • david s
    replied
    Re: Lightweight Concrete

    Vermicrete is not particularly strong and the Portland cement breaks down at around 300C so you are most likely to have a failure.

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  • brickie in oz
    replied
    Re: Lightweight Concrete

    Originally posted by dmorgs View Post
    I'm thinking of pouring an in place, lightweight concrete chimney (vermeculite).
    I should imagine it would crumble and fall over.

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  • dmorgs
    started a topic Lightweight Concrete

    Lightweight Concrete

    I'm thinking of pouring an in place, lightweight concrete chimney (vermeculite). Also, I'm going to apply an insulating coat on my dome with lightweight. The dome is recently finished.
    Any of you with experience care to illustrate the difference in the two mixes. I read the section about this on the website but I'm a little confused, hoping to get a more basic understanding.
    Thanks, JJ
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