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Unformatted text preview: nteresting about the Pantheon is the fact that the builders used more than one type of concrete mix in the dome. You should remember that Roman concrete was very thick and contained a lot of rubble. On the lowest areas of the building, the rubble in the concrete consists mainly of travertine, a very heavy limestone. The next level has concrete containing rubble of travertine, tufa, a much lighter stone, and brick, which was even lighter than tufa. The next level up had rubble of tufa and brick, the level above that just brick, and finally the concrete at the top of the dome has rubble made of pumice, an extremely light volcanic stone. By reducing the density of the concrete in the upper layers, the builders of the Pantheon were able to reduce the stresses that such an enormous dome would have on its supports. And clearly it worked: the Pantheon still stands today, its massive dome completely intact! 7 Now we’re going to move to Tivoli and look at the villa that Hadrian built there for himself. On the right is a plan of the massive complex, of which we will only see a small portion. As you can see...
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This note was uploaded on 09/28/2011 for the course PL SC 101 taught by Professor Web during the Summer '11 term at Penn State.

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