Quote:
Originally Posted by Baronvonellis
If the Roman concrete is more durable why isn't it being used now?
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The problem was that the techniques and knowledge was lost, along with most written records, when most of Rome burned between the 4th and 8th centuries. Not to mention the general reduction in literacy.
It wasn't until recently that we were able to determine the chemical composition. That said we still lack information on the ratios used to create the mixtures that comprise concrete...which is all the more difficult since...as said above...they tended to vary it as they went.