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Why Roman concrete is still stronger than RAAC (and other modern concretes)
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Our newer concrete is better for the goals we are setting in construction, which does not tend to include permanence. Our goals are mostly about strength to weight ratios and other properties that allow for massive numbers of floors with and as little mass as possible with reliability measured in decades. Basically guaranteed to last reliably with minimal upkeep.
We are continuously practicing new ways to build with concrete, wtf are you talking about?