[1] According to this hypothesis, soft limestone with a high kaolinite content was quarried in the wadi on the south of the Giza Plateau.
Proof-of-concept tests using similar compounds were carried out at a geopolymer institute in northern France and it was found that a crew of five to ten, working with simple hand tools, could agglomerate a structure of five, 1.3 to 4.5 ton blocks in a couple of weeks.
Geologists have carefully scrutinized Davidovits's suggested technique and concluded his concrete came from natural limestone quarried in the Mokattam Formation.
[4] Michel Barsoum and his colleagues at Drexel University published their findings supporting Davidovits's hypothesis in the Journal of the American Ceramic Society in 2006.
[5] Dipayan Jana, a petrographer, made a presentation to the ICMA (International Cement Microscopy Association) in 2007[6] and gave a paper[7] in which he discusses Davidovits's and Barsoum's work and concludes "we are far from accepting even as a remote possibility a 'man-made' origin of pyramid stones."