For Chefren, same problem, the core is made of agglomerated stone, but this time... the granite... more easily ...was only for the casing of the firs… - Joseph Davidovits

[I]f they over exploited the palm trees in the production of the ashes... then they got into an ecological disaster because... [i]f there is no more palm trees, there is no more agriculture, and... the end of the pyramid construction. ...[T]his technology, even though it was a sacred one, was dangerous.

They turned back to mud because mud bricks is also a replica of incarnation, in the materials that belong to the Khnum divinity.

How should we consider geopolymers? ...a new material, a new binder or a new cement for concrete? Geopolymers are all of these. They are new materials for coatings and adhesives, new binders for fiber composites, waste encapsulation and new cement for concrete. The properties and uses are being explored in... inorganic... physical... [and] colloid chemistr[ies], mineralogy, geology, and... engineering process technologies. The ...potential applications... fire resistant materials, decorative stone artifacts, thermal insulation, low-tech building materials, low energy ceramic tiles, refractory items, thermal shock refractories, foundry applications, cements and concretes, composites for infrastructures repair and strengthening, composites for infrastructure repair and strengthening, high-tech composites for aircraft interior and automobile, high-tech resin systems, radioactive and toxic waste containment, arts and decoration... archaeology and history of sciences.