Sensor-assisted sorting process for recycling ­construction materials

Returning used masonry bricks to the production cycle and, likewise, closing resource recycling loops both require that the material be mono-fractionated. That, in turn, requires that the bricks be separated from masonry rubble by extraction processes and from plaster and other extraneous/waste material by automatic sorting processes situated downstream. Sensor-assisted sorting in the near-infrared range is helpful in separating gypsum-based plaster and similar construction materials from demolished brick masonry. Near-infrared sortation is a non-destructive, near-surface process in which spectra containing information about the chemical-mineralogical composition are obtained. Chemometric methods enable the use of such spectra for differentiating between diverse building materials and, hence, recovering segregated volumes of them.

Dipl.-Ing. Mirko Landmann, IAB – Institut für Angewandte Bauforschung Weimar gemeinnützige GmbH

Leonard Raumann, M.Sc., Institut für Ziegelforschung Essen e.V.


Related articles:

Issue 2012-11

Sensor-based brick sorting and potential for recycling

Building rubble is made up of demolished structural concrete and masonry rubble. The latter is heterogeneous, i.e., it is made up of clay bricks, mineral bonded masonry blocks and various minor...

Issue 2017-1

Innovative new sorting process for the energy efficient use of recycled building material

1 Context Due to the use of increasingly complex composite materials in the construction industry, future technological criteria for the preparation of mineral-based construction and demolition waste...

Issue 2015-8

54th Würzburg Brick and Tile Training Course

We shall present abstracts of all papers here: What makes our employees sick? Radioactivity of ceramic construction materials Clay brick and tile making – fit for the future? Avoiding...


The beautiful art of building with bricks – the empathetic relationship of the architects with clay bricks

1 Introduction Man has been building houses with brick walls for thousands of years. Of course, not just with bricks and not always in the same intensity. But if you ask what importance brick masonry...

Issue 2012-05

Erik Kjær – 40 years at the Danish Technological Institute

In March 2012, Erik Kjær celebrated his 40th anniversary at the Danish Technological Institute, Masonry and Building Components. Born on 19 May 1947, he completed his studies at The Engineering...