Clay and plasticity
Clay materials for buildings. Base materials and production processes

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C905 V2 Article

Clay and plasticity
Clay materials for buildings. Base materials and production processes

Author : Michel KORNMANN

Publication date: May 10, 2009 | Lire en français

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1. Clay and plasticity

Production mixes for terracotta products are based on clays, which are mainly hydrated aluminum phyllosilicates. The prefix phyllo indicates that these silicates are in sheet form. They are products of the chemical degradation of the components of the original magmatic rocks, in particular the feldspars and micas of granites, according to a reaction of the type :

K−feldspath+H++eau→kaolinite+K++quartz

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