[Starlink] Fondag

[David Lang]

most of the area directly under the engines was Fondag. After the 7 engine 
static fire they added some, it broke under the 14 engine static fire, and they 
replaced all the concrete under the pad (I don't know if it was Fondag for the 
full depth or just a top layer) so what was hit by the 31 engines static fire 
was a full layer of Fondag.

David Lang
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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 at 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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