Category: Orthodontist

Concrete 2

Concrete is one of the many essential components in creating the massive skyscrapers we see today. It’s what’s used to build our homes, pavements, roads, schools and other establishments for its durability and ability to gain strength as years go by. Concrete can withstand earthquakes and other natural disasters. One example of concrete’s durability is the 1500-year-old Roman Colosseum. Not many realize that concrete is the world’s most used man-manufactured material and is used more […]

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The Babylonians from 1700 BC used clay as their bonding substance and the Egyptians used gypsum and lime as binders, which more closely resembles modern concrete. Lime, derived from limestone and chalk, continued to be the primary cement-forming agent until the early 1800s. And in 1824, an English inventor named Joseph Aspdin ground together a mixture of clay and limestone. We now know it as Portland cement and is still the dominant cementing agent used […]

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