Why Roman concrete still stands strong while modern version decays: Scientists have cracked the secret to Roman water-based structures’ strength – and findings could help today’s builders. Their structures are still standing more than 1,500 years after the last centurion snuffed it: now the Romans’ secret of durable marine concrete has finally been cracked. The Roman recipe – a mix of volcanic ash, lime (calcium oxide), seawater and lumps of volcanic rock – held together piers, ...
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