"The whole aim of practical politics is to keep the populace alarmed (and hence clamorous to be led to safety) by menacing it with an endless series of hobgoblins, all of them imaginary." ~ H.L. Mencken
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