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Why portland cement is called portland?

In 1824, Joseph Aspdin, a bricklayer and mason in Leeds, England took out a patent on hydraulic cement, and he called it Portland cement. And he called it that because the color resembled the stone that they quarried on the Isle of Portland off the British coast. Now, his method involved the careful proportioning of limestone and clay.

He pulverized them, and then burned the mixture into what he…