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They had concrete barges back in Nam. Didn't sink any with small arms that I know of.
You can make roman concrete or even better using locally sourced materials. Some of the new additives are amazing. 2000 years, dunno. Roman structures could have been done dry laid no cement.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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