I found this persuasive: https://www.tandfonline.com/doi/abs/10.5408/0022-1368-40.1.25 https://www.tandfonline.com/doi/abs/10.5408/0022-1368-40.1.2... (Journal

I found this persuasive: https://www.tandfonline.com/doi/abs/10.5408/0022-1368-40.1.25 https://www.tandfonline.com/doi/abs/10.5408/0022-1368-40.1.2... (Journal of Geological Education, Volume 40, 1992 - Issue 1), "Are the Pyramids of Egypt Built of Poured Concrete Blocks?" "Since 1974 Joseph Davidovits, a French concrete chemist, has been proposing that the pyramids and temples of Old Kingdom Egypt were built of geopolymer “concrete” poured into molds, rather than quarried blocks of limestone. We use geological evidence and engineering principles to demonstrate the flaws in this daring hypothesis. Pyramid and temple blocks show sedimentary bedding, burrows, and optical and SEM-scale properties characteristic of normal microporous limestones, and they are cut by tectonic fractures. Block dimensions and shapes are not likely to be the product of pouring into wooden molds, and some blocks show quarrying marks. It is not easy to give a geological education to a brilliant and determined chemist."