Some 2,000 years after they were first erected, Ancient Roman harbours made from concrete are still standing across Europe. Meanwhile, more modern constructions have proved far less durable, crumbling into the water in a mater of decades. Finally, scientists have solved the puzzle of what made the ancient concrete so strong — and they think the discovery could make modern buildings more environmentally friendly. Concrete used for ancient sea walls was made by mixing lime,
Mystery of 2,000-year-old Roman concrete solved by scientists
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