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DimTex 07-21-2009 02:21 PM

Concrete curing time
 
Hello,
I built my stand and poured the concrete hearth this past weekend. I covered the wet slab with burlap to keep it moist overnight and in the morning I found some of the portland cement had coated the surface of the concrete, maybe a total of a cup for the entire slab. I assume the burlap helped wick this. The slab seems solid but how do I tell? Also, how long should I let it cure before I start with the insulating layer of portland and perlite?

dmun 07-21-2009 03:40 PM

Re: Concrete curing time
 
Don't worry about the surface of your concrete slab. Concrete will cure underwater. How do you think they build bridges? As long as it's the right thickness and properly reinforced you are good to go. You can place your vermiculite concrete right away: at one point it was suggested to pour the support slab and the insulating layer one right after another. You should let your concrete cure for a week before proceeding with your floor and dome.

Neil2 07-21-2009 07:33 PM

Re: Concrete curing time
 
I agree. Keep it wet for a week.

DimTex 07-22-2009 09:37 AM

Re: Concrete curing time
 
You mean letting the portland and perlite mixture wet cure for a week? Thanks

dmun 07-22-2009 10:03 AM

Re: Concrete curing time
 
I would: it takes a while to solidify into the cork-like consistency you're looking

DimTex 07-22-2009 10:24 AM

Re: Concrete curing time
 
Quote:

Originally Posted by dmun (Post 60199)
I would: it takes a while to solidify into the cork-like consistency you're looking

Okay, that's good. One more question: The 5 parts Perlite to 1 part Portland Cement, that's by volume correct? Once poured do I just screed the mixture level or should I try and float it flat like the concrete?

Thanks

dmun 07-22-2009 03:44 PM

Re: Concrete curing time
 
Quote:

The 5 parts Perlite to 1 part Portland Cement, that's by volume correct? Once poured do I just screed the mixture level or should I try and float it flat like the concrete?
Yes, by volume, mix the dry ingredients until fully coated then add water until just wet.

You won't be able to float this mixture, the best you're going to be able to do is pat it flat on top with your trowel.

karl 07-23-2009 03:39 AM

Re: Concrete curing time
 
Quote:

I found some of the portland cement had coated the surface of the concrete
This is typically something you will experience if your concrete is on the wet side. In serious cases it could weaken the concrete due to depletion of cement, but for such small structures and dimensions we are talking about here there is nothing to worry about.

regards from Karl

DimTex 07-28-2009 01:59 PM

Re: Concrete curing time
 
Thanks for all the answers


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