Is Roman Concrete Self-Healing? Research Reveals the Reason for Its Long-Lasting Durability

A calcium-rich lime clast (in red), which is responsible for the unique self-healing properties in this ancient material, is clearly visible in the lower region of the large-area elemental map (Calcium: red, Silicon: blue, Aluminum: green) of a 2 cm fragment of ancient Roman concrete. Image Cortesia de the researchers (MIT)

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