It's also interesting that SpaceX has gone through all of this before...
https://youtu.be/0xWRhKB3JTM?t=1340

On Wed, Apr 26, 2023 at 3:35 PM Nathan Owens <nathan@nathan.io> wrote:

> Only some small portion of the pad was Fondag -- seen here
> [image: Screenshot 2023-04-26 at 3.35.22 PM.png]
>
>
> Good video: https://www.youtube.com/watch?v=zKhJwWymJWE
>
> On Wed, Apr 26, 2023 at 3:30 PM Bruce Perens via Starlink <
> starlink@lists.bufferbloat.net> wrote:
>
>> I found it interesting that the pad was constructed of Fondag. This is
>> pure calcium aluminate cement. The cement and aggregate are both made of
>> the same clinker, there's just a difference in size of the particles. The
>> aggregate doesn't simply have a physical bond to the cement, there is a
>> chemical bond as well. The aggregate and cement are non-porous. Fondag can
>> resist thermal cycling from -395 to 2000 F. It doesn't shed lime.
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>