[MHGinTN]

Carving out rock, turning it into powder and transporting it to the construction site, then reconstituting it ... gee, we do that even today! The Romans has concrete technology, why not the Egyptians a form of similar methodology?

I'm checking in occasionally to see how this discussion goes. Have a nice evening.

[count-your-change]

The Romans used a kind of volcanic dust to make their mortar but none such is known for the Egyptians.
If the Egyptians could carve out blocks why and how would they crush them to dust only to reform them later?
There is plenty of evidence of ancient stone cutting technology but where is there any evidence of large scale stone crushing, form building, and concrete mixing and pouring equipment in ancient Egypt?
To anyone who has worked with concrete the notion of Egyptians forming up and pouring concrete for their structures is absurd. But totally so.