[W]e observe a dramatical stop of the technology. ...[T]he variation of the pyramids' volume with time... from the invention by Djoser to the Cheops … - Joseph Davidovits

What about the Cheops pyramid? ...We have the core, this is the mass, more than 2 million tons ...made of ...reagglomerated limestone. But ...in the ...inner ...it is made of granite ...carved stone. Why? Cheops... is Khnum Kufu... agglomerated stone. However, Pharaoh is the king of the two countries. ...[T]he pyramids must be the representation of Egypt,... which means ...the replication of agglomerated stone for the northern part ....and in the south, natural granite that is the carving technology. So we have agglomerated limestone for the core, and the King's chamber is made of split granite that is dressed [cut] ...not carved granite.

In ancient times the Sinai mines were rich in deposits of and , neede for the production of synthetic zeolites. The mines also contained the arsenic minerals of and , needed to produce rapid hydraulic setting in large concrete blocks.

[T]he real breakthrough took place when, in 1978-1980, we developed... a -based geopolymeric liquid binder comprising soluble alkali-silicate... the first mineral resin ever manufactured. ...The commercial product ...Geopolymite^TM, was a good fire resistant alternative to organic resin.