While modern concrete deteriorates after a few decades of exposure to seawater and ocean climates, many Roman piers and breakwaters have dissolved little in 2,000 years.
University of Utah researcher Marie D. Jackson has discovered the Romans’ volcanic secret.
Jackson’s team found that the type of concrete used by the Romans — a mixture of volcanic ash and lime — actually became stronger when immersed in the ocean. The salt water partially dissolves the ash and lime cocktail and new interlocking...
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