Hydraulic Lime Concrete
Hydraulic Lime concretes have been in use since Roman Times either as mass foundation concretes or as lightweight concretes using tufa or pumice as aggregates and a wide range of pozzolans to achieve different strengths and speeds of set. This meant that lime could be used in a wide variety of applications including floors and even vaults or domes. An example is the Pantheon in Rome which has survived for nearly two thousand years, the dome's diameter is equal to its height from the floor. It has six different lime mixes which change the properties and lightness of the material.
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