[ARC5] cement

[J. Forster]

I think modern cement is somewhat different, not just (Calcium Oxide)
lime. Modern 'hydraulic cement' which expands some as it sets uses the
Calcium Oxide plus other things.

Calcium Oxide, is also called Lime. To make mortar used for bricks, the
Lime is 'slaked' by adding water, then sand and other stuff.

-John

================


> On 16 Oct 2012 at 10:03, J. Forster wrote:
>
>> 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)
>
> That is really neat, John. I never did know how it was done, but I
> certainly
> have always liked the result: my step-father was a general contractor in
> Montana...
>
> Ken
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