"The world always makes the assumption that the exposure of an error is identical with the discovery of truth -- that the error and truth are simply opposite. They are nothing of the sort. What the world turns to, when it is cured on one error, is usually simply another error, and maybe one worse than the first one." ~ 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