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We Finally Know How Ancient Roman Concrete Was Able to Last Thousands of Years
(www.sciencealert.com)
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this post was submitted on 01 Feb 2024
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Epoxy covered rebar exists as does one made from stainless steel. It's just quite pricey so it's rarely used unless absolutely necessary. Rust is generally not an issue as long as the rebar is deep inside the concrete. When it's close to the surface and gets exposed to elements is when the problems start.