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[–]zyxzevn 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (1 child)

Also check the geopolymers option.
https://www.geopolymer.org/
An ancient form of concrete. There is also the chemical weakening of stones.

[–]iraelmossadreddit[S] 3 insightful - 1 fun3 insightful - 0 fun4 insightful - 1 fun -  (0 children)

wow the pyramids being made of something like that makes sense. that would be so easy to make that way. no aliens needed lol... dang freemasons are like no way you can't do that! all the building codes were setup for the brick industry and timber industry.