How long has cement been around?

Answer 1

Cement has been used for thousands of years, with its earliest forms dating back to ancient civilizations. The Romans developed a form of hydraulic cement around 300 BC, which was used in structures like the Pantheon and aqueducts. Modern Portland cement, which is the most widely used type today, was patented in 1824. Thus, while basic forms of cement have existed for over two millennia, contemporary cement technology is about 200 years old.