http://www.telegraph.co.uk/science/2017/07/03/secret-roman-concrete-survived-tidal-battering-2000-years-revealed/
Citando:
"For the new study researchers studied cores of concrete from the ancient Roman pier, Portus Cosanus in Orbetello, Italy using high-powered light beam x-rays and discovered the minerals had grown into the cracks caused by tidal erosion, proving that the saltwater reaction continues even after the concrete has set.
In contrast most modern concrete is a mix of Portland cement - limestone, sandstone, ash, chalk, iron, and clay, among other ingredients, heated to form a glassy material that is finely ground - mixed with sand or crushed stone that are not intended to chemically react, and so do not cause mineralisation when mixed with saltwater."
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