Seawater makes ancient concrete stronger, so it lasts while modern structures crumble into the sea. Researchers have now discovered that elements in the volcanic substance react with sea water, strengthening the material 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.
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Source: Mystery of 2,000-year-old Roman concrete solved by scientists | The Independent