[ARC5] cement

[J. Forster]

This is what happens:

To Make:
Limestone or marble + heat ==>  Calcium Oxide + CO2
Grind that up to make cement.

To use:
Mix w/ sand and aggregate; add water

Setup:

Calcium Oxide + water ==> Calcium Hydroxide
Calcium Hydroxide + CO2 from the air ==> Calcium Carbonate. (limestone)

-John

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> On 16 Oct 2012 at 7:28, gordon white wrote:
>
>>     Marble ( in statues) is essentially metamorphosed limestone.
>> Portland cement is limestone, ground up and heated.
>
> Just in case this is not well known here, the "secret" of Roman-made
> waterproof cement was lost for many centuries until some French-man did
> considerable research on it sometime in the mid to late 1800s, and finally
> arrived at pretty much the formula we use today.
>
> Ken W7EKB
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