What concrete things the Romans have ever done for us
June 21, 2013 8:53 AM Subscribe
"Portland cement is the source of the “glue” that holds most modern concrete together. But making it releases carbon from burning fuel, needed to heat a mix of limestone and clays to 1,450 degrees Celsius (2,642 degrees Fahrenheit) – and from the heated limestone (calcium carbonate) itself. Monteiro’s team found that the Romans, by contrast, used much less lime and made it from limestone baked at 900˚ C (1,652˚ F) or lower, requiring far less fuel than Portland cement." -- How Berkeley Lab scientists discovered the secret of Roman concrete's durability and how it could help make modern concrete more environmentally friendly.
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