#21  
Old 04-25-2012, 09:27 PM
david s's Avatar
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Default Re: correct oven plans

Only mix one bag ( 25 kg)at a time and if it is hot use chilled water. Adding more water once it has started to go off is not good. You should have it placed and vibrated before it starts to go off.
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  #22  
Old 04-25-2012, 09:45 PM
Peasant
 
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Default Re: correct oven plans

Yup. I know that now. These bags are 50 pounds each. Does it matter if I mix this in an electric mixer or a wheel barrel? Also, do I need to pull this stuff out of the forms I mixed up today and throw it away and start over?

Man, I did not realize the open time on this stuff was so short.
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  #23  
Old 04-25-2012, 09:54 PM
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Default Re: correct oven plans

I prefer to use a barrow to mix it because you can see the mix better and the stuff sticks to the sides of a mixer too much for me and makes cleaning difficult. Also you should rinse off your tools and your barrow as any trace of previous mix will tend to accelerate the rate fresh added mix will go off. Hard to say about what you've done and whether to leave it or remove it and start again. You'll probably be ok, but don't blame me if it isn't.
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  #24  
Old 04-25-2012, 10:02 PM
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Default Re: correct oven plans

I expect you to take full responsibility for my mistakes. I will let you know how it goes tomorrow.
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  #25  
Old 05-01-2012, 08:52 AM
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Default Re: correct oven plans

Thanks for all the help and advice. I finally finished the pour!! Can I leave the finished cast material exposed to the elements before I cover it with vermiculite and portland?

I will try to post pics. Very challenging to post pics.
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  #26  
Old 05-01-2012, 01:18 PM
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Default Re: correct oven plans

Quote:
Originally Posted by TapRackFire View Post
Thanks for all the help and advice. I finally finished the pour!! Can I leave the finished cast material exposed to the elements before I cover it with vermiculite and portland?

I will try to post pics. Very challenging to post pics.
Yes, castable only needs 24 hr to cure unlike Portland cement products that need 28 days to cure.
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  #27  
Old 05-01-2012, 01:57 PM
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Thumbs down Re: correct oven plans

Quote:
Originally Posted by TapRackFire View Post
i had another question come up about my firebrick. I bought the 4.5 x 9 x 2.25 inch firebrick. I was told it was rated to 1700 degrees. I assume 1700 F.

A supplier I was trying to get my needles from said the bricks I bought are a "low or light duty". He said they would fail quickly over time. He said I should have bought the "medium duty" fire brick. He quoted these good 2700 F.

It is not too late. I can take my bricks back if I need to and get the right ones.

Has anybody used these "Low or light" duty bricks?
I bought the low duty brick and returned them and acquired the medium duty. If it isnt too late i would definitely recommend getting the better bricks.
Texman
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Old 05-01-2012, 02:02 PM
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Default Re: correct oven plans

i reread the thread. Where are you using the firebrick if you are building a castable?
Tracy
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  #29  
Old 05-01-2012, 07:23 PM
Peasant
 
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Default Re: correct oven plans

I layed a base of firebrick to be used as the floor of the oven. I set my forms ontop of the firebrick and poured the walls and ceiling. Did I do it wrong? It is way too late now. What should I have done?
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  #30  
Old 05-02-2012, 07:03 AM
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Default Re: correct oven plans

yes, move on. The main problem may be some spall (pieces coming loose) from the heat. Wotavidone is right, you can replace them in the center if needed. Sorry to give you the scare, you can use the higher duty brick later if needed.
How about some pics?
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