152: Built to Last

We give a "solid foundation" to chemistry by recounting the history of concrete, starting with the earliest architectural use of lime around 10,000 years ago. We continue through ancient history and modern times with Roman concrete, the loss of its recipe, and (partial) rediscovery in the Renaissance. We continue to the present and the likely complete rediscovery of Roman concrete in the 21st century. We talk of the chemical reactions to make and set concrete, and its ecological problems. Finally we learn a bit about some efforts to make concrete a little more "green."

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