Clay mineralogy - an important basis for using clay raw materials in an optimal way

Composed mainly of fine-grained minerals, clay is a naturally occurring material which is malleable when moist and hard when dried or fired. In soil science, clay is defined as having a grain size fraction of less than 2 µm. Clays are largely composed of clay minerals, i.e. phyllosilicates. The proportion and type of phyllosilicates contained in clays decisively determines their properties and therefore also their fields of application.

Clays play an important role in many areas of the construction industry. Be it in the exploration of repositories, in the construction of landfills and in liquid soils, or as an important raw material for manufacturing building materials such as roof & wall tiles or cement. Calcined clays are one of the most promising materials as a substitute for clinker in cement and thus to optimize the carbon footprint.

The basic prerequisite for assessing the suitability of clays for a wide range of applications is an exact and correct determination of the mineralogical and chemical composition.

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