[spanalot]

This looks like an answer in search of a question.

whats the agenda here? and why so long to figure out the difference between concrete and stone?

[Rurudyne]

Actually, I first heard about this years ago.

If I recall correctly, the chemical process turns limestone aggregate into a putty that then hardens and so nearly resembles ordinary limestone that you have to look at it under a microscope to see the differences.

At the time, again if I recall correctly, the idea was poo-pooed because it was against the conventional wisdom which not only stated how these structures were likely to have been built but also that anything like concrete didn't become available till much later.

A comparable bugaboo with conventional wisdom––one with more profound meaning for Egyptology and history in general––may be simmering because of a simple observation that one "earlier" tomb had been built on to of an "older" tomb. The proposed solution: two dynasties ruling from different capitals at the same time. The implications of dropping a few hundred years out of the accepted time line are staggering; however, is true this would fix a number of problems with history (and for the record, Ramses would be the Pharaoh associated with the sacking of Jerusalem at the time or Rehoboam and not the Exodus ... just one bit of conventional wisdom that may be wrong according to this idea).