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Posted by Chuck on April 19, 2007, 2:46 am
> Hi,
>
> I am forming a concrete mantel above an existing fireplace. I will
> then cement on Sandstone to the concrete mantel as the finished
> product.
>
> Before I concrete it, I wanted to know whether there is an addidtive
> that would make the concrete more heat resistant and less likely to
> crack. Any advice on the concrete mix would be appreciated !
>
> thanks - Anth
>
Don't worry about the heat resistance on a fireplace mantel. The amount of
heat is small.
There are additives for less water and quick curing not necessary for heat
if I remember correctly.
Use 28 day concrete strength of 3000 psi for the mantel it should be strong
enough. Not less than 1 1/2" thick.
You should have a good way to support the concrete mantel prior to the
installing the sandstone. The concrete mantel will weigh about 18 psf.
CID...
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