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Old 11-10-2011, 08:52 AM
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Default 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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Old 11-10-2011, 10:52 AM
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Default Re: Lightweight Concrete

Quote:
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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Old 11-10-2011, 12:07 PM
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Default 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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Old 11-10-2011, 01:21 PM
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Default Re: Lightweight Concrete

Better of getting an insulating refractory castable, they do make a lightweight 1400c grade material. Not crumbly at all.
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Old 11-10-2011, 01:23 PM
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Default Re: Lightweight Concrete

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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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Old 11-10-2011, 01:30 PM
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Default 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 at 01:33 PM.
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Old 11-10-2011, 01:50 PM
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Default 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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Old 11-10-2011, 05:25 PM
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Default Re: Lightweight Concrete

Okay then, clear enough I guess. What about the mix for the insulating layer?
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Old 11-10-2011, 08:19 PM
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Default Re: Lightweight Concrete

Quote:
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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