The Romans were aware of the heavy nature of their building - TopicsExpress

The Romans were aware of the heavy nature of their building materials. So they used lighter materials toward the top of the dome of the Pantheon in Rome. On the lowest level travertine, the heaviest material was used, then a mixture of travertine and tufa, then tufa and brick, then all brick was used around the drum section of the dome, and finally pumice, the lightest and most porous of materials on the ceiling of the dome. businessweek/articles/2013-06-14/ancient-roman-concrete-is-about-to-revolutionize-modern-architecture#r=hpt-ls

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