Aggregate

Aggregates are a group of components of a mixture that is used as a material that is not a primary function carrier. The aggregates belong to the auxiliary materials ( additives ) .

Important functions of the aggregates are:

As a filler (body) : They give the binding body from the binding agent hold to avoid sedimentation and give the material volume and stability ( matrix of the material).
As a leaning agent : They initially serve to reduce the required proportion of more expensive binders. In the case of shrinking binder systems, the leaning also helps to reduce shrinkage .
Composites that give the building material properties of a composite material .
Hardeners that give the material greater mechanical strength.

Examples:

The aggregates in construction technology : Mineral fillers of natural or artificial origin that are added in the production of asphalt , concrete , mortar or plaster and determine the character of the building material ; the grains also serve as a leaning agent - in particular in road construction, the standard stipulates that the aggregate should be described as such and not as an aggregate
the emaciation of ceramics and pottery : highly heat-resistant materials that absorb the enormous loss of clay during firing. The most important modern substance is chamotte

Fines , as Feinstsände , talc , marble dust and other minerals , chalk , titanium dioxide in renders, filling compounds , stucco , coating materials

Fibers (for fiber composite materials ) such as mineral wool , glass fibers , carbon fibers , formerly asbestos , wood wool , plant fibers , also straw and animal hair in historical building materials

Fillers for lightweight materials that are used for structural reasons and for insulation materials in heat and sound insulation : foam , expanded clay , expanded glass , expanded slate , foam glass , perlite , vermiculite , cellulose fibers or flakes, etc.,

Optical functional elements such as glass spheres as reflectors

Hard materials in the true sense of the word, or quartz and other selected hard rocks

Fillers for colorants that give it body, such as chalk or talc

literature

DIN German Institute for Standardization e. V. (Ed.): DIN-Taschenbuch 157: Farbmittel. 3rd edition, Beuth Verlag GmbH, Berlin / Vienna / Zurich 1997
Kurt Wehlte : Materials and techniques of painting. Otto Maier Verlag, Ravensburg 1967, ISBN 3-473-48359-1