I hav'nt been able to find the relevant concrete/Pyramid URL.
But from memory it was only the outside casing stones that were cast in this way. Giving them an exceptionaly smooth sun reflecting surface.
All the external casing stones were taken away to build early Cairo.
p.s Their 'concrete' was not of the accepted mix as we know it.

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"You will never find a real Human being - even in a mirror."

.....Mike Kremer.
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"You will never find a real Human being - Even in a mirror." ....Mike Kremer.