"Constitutions are made of paper; bayonets are made of steel." ~ French aphorism
Self-sufficient Living – Making Cement And Lime Like In The Old Days
"All the ancient cultures made cement without the use of electricity or petroleum products. And their cement-glued masonry is still standing, in structures, they built their empires on. With a little trial-and-error experimentation, you too can heat and crush limestone, and make your own cement."
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Roman concrete is a good example of a material that gets stronger with age. The main difference from modern concrete is the use of volcanic ash instead of Portland cement, as well as larger aggregate materials. https://en.m.wikipedia.org/wiki/Roman_concrete