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1. Categories and properties
While the airborne or hydraulic nature of lime is only established at the end of the manufacturing process, the choice of raw materials is actually the key to success.
A lime will only have a hydraulic character if the selected raw materials are limestones containing silica, possibly alumina and iron.
Silica and alumina being two of the main constituents of clays, the terms "calcareous clay" or "calcareous marl" are also often used.
The various stages in the manufacture of the two types of lime are then relatively comparable. The manufacturing process for hydraulic limes is detailed in § 2
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