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Joseph Davidovits (born 23 March 1935) is a French materials scientist known for the invention of geopolymer chemistry. He posited that the blocks of the Great Pyramid are not carved stone but mostly a form of limestone concrete or man-made stone. He holds the Ordre National du Mérite.
Davidovits asserts that the ancient Egyptians did not possess the tools or technology to carve and haul the huge (2.5 to 15 ton) limestone blocks that made up the Great Pyramid, conjecturing instead that the blocks were molded in-place by using a form of limestone concrete. According to his theory, a soft limestone with a high kaolinite content was quarried in the wadi on the south of the Giza plateau. It was then dissolved in large, Nile-fed pools until it became a watery slurry. Lime (found in the ash of ancient cooking fires) and natron (also used by Egyptians in mummification) was mixed in. The pools were then left to evaporate, leaving behind a moist, clay-like mixture. This wet "concrete" would be carried to the construction site where it would be packed into reusable wooden molds. In the next few days the mixture would undergo a chemical hydration reaction similar to the setting of cement.
Davidovits' theory is inconsistent with the geological evidence.
- Davidovits, Joseph (1983). Alchemy and the Pyramids. Saint Quentin, France: Geopolymer Institute.
- Davidovits, Joseph (2002). Ils ont Bâti les Pyramides: Les Prouesses Technologiques des Anciens Egyptiens. Paris: J.-C. Godefroy.
- Davidovits, Joseph (2005). La Bible avait raison, Tome 1: L'archéologie révèle l'existence des Hébreux en Égypte. Paris: J.-C. Godefroy.
- Davidovits, Joseph (2006). La Bible avait raison, Tome 2: sur les traces de Moïse et de l'Exode. Paris: J.-C. Godefroy.
- Davidovits, Joseph (2006). La nouvelle histoire des pyramides. Paris: J.-C. Godefroy.
- Davidovits, Joseph (2008). Geopolymer Chemistry and Applications. Saint Quentin, France: Geopolymer Institute.
- Davidovits, Joseph (2009). De cette fresque naquit la Bible. Paris: J.-C. Godefroy.
- Davidovits, Joseph (2009). Why the Pharaohs Built the Pyramids with Fake Stones. Saint Quentin, France: Geopolymer Institute.
- Are the Pyramids of Egypt Built of Poured Concrete Blocks?, Journal of Geological Education Volume 40, 1992 - Issue 1