Unmixed

Efficiency of processing methods for the recovery of unmixed material fractions from masonry - Part 1

2 Betonfertigteil mit integrierter Wärmedämmung • Prefabricated concrete element with integrated thermal insulation

3 Hochlochziegel mit Kammerfüllung • Vertically cored clay brick with chamber filling

$4 Beispiele für Technologien in der Aufbereitung von Mauerwerkbruch zu sortenreinen Materialfraktionen in stationären Anlagen • Examples of technologies in the processing of masonry rubble to unmixed material fractions in stationary installations$

4 Beispiele für Technologien in der Aufbereitung von Mauerwerkbruch zu sortenreinen Materialfraktionen in stationären Anlagen • Examples of technologies in the processing of masonry rubble to unmixed material fractions in stationary installations

5 Befreiung von Wertstoffpartikeln durch die Aufschlusszerkleinerung anhand eines Mauerwerksegmentes • Liberation of recyclable particles with liberation comminution based on a segment of masonry

6 Aufschlussdiagramm mit charakteristischer Aufschlusskennlinie des Wertstoffmaterials und den entstehenden Partikeltypen • Liberation diagram with characteristic liberation curve of the recyclable material and the particle types produced

7 Untersuchungsmethodik • Test method

8 Partikelgrößenverteilung von RC2 (Hochlochziegel) • Particle size distribution of RC2 (vertically cored clay bricks)

9 Partikelgrößenverteilung von RC6 (Kalksandstein) • Particle size distribution of RC6 (sand-lime bricks)

10 Partikelgrößenverteilung von RC9 (Porenbeton) • Particle size distribution of RC9 (aerated concrete)

11 Partikelgrößenverteilung von RC10 (Leichtbeton) • Particle size distribution of RC10 (lightweight concrete)

12 Zerkleinerungsverhältnis Z₈₀ der Produkte • Size reduction ratio Z₈₀ of the products

13 Anteil aufgeschlossener Wertstoffpartikel von RC2 (Hochlochziegel)
Percentage of liberated recyclable particles of RC2 (vertically cored clay bricks)

14 Anteil aufgeschlossener Wertstoffpartikel von RC6 (Kalksandstein) • Percentage of liberated recyclable particles of RC6 (sand lime brick)

15 Anteil aufgeschlossener Wertstoffpartikel von RC9 (Porenbeton) • Percentage of liberated recyclable particles of RC9 (aerated concrete)

16 Anteil aufgeschlossener Wertstoffpartikel von RC10 (Leichtbeton) • Percentage of liberated recyclable particles of RC10 (lightweight concrete)

17 Zurückgewinnbarer Wertstoffanteil • Percentage of recoverable recyclables

18 Säurelösliche SO₃-Gehalte der mit dem Prallbrecher zerkleinerten Wände • Acid-soluble SO₃ content of the walls comminuted in the impact crusher

1 Materialverbünde und Materialdiversität in mineralischen Bau- und Abbruchabfällen • Material composites and material diversity in mineral construction and demolition waste

Summary: In future, as a consequence of modern masonry construction, an increased volume of complex material composites and wider material diversity in mineral construction and demolition waste can be expected. To enable the reuse of recycled aggregate in production, such material composites must first be separated into unmixed material fractions. Adhesive bonds that normally have to withstand external mechanical influences for as long as possible must be broken down during processing. In this context, besides efficient sorting and the discharge of impurities and contaminants from the recyclable fractions, liberation comminution is one of the main requirements for the recovery of unmixed material fractions. This report discusses the performance limits of the mechanical processing methods used in building materials recycling to separate material composites and prepare for the production of unmixed bulk solids.

1 Introduction

To meet the growing demand for the reuse of recycled mineral aggregate in production, a strategy of differentiation or integration can be adopted [1]:

• Differentiation strategy: the various types of mineral building materials are separated and introduced into a material cycle as unmixed building material fractions.

• Integration strategy: only contaminants are removed from the construction waste and the still mixed building material fractions are used in appropriate applications.

For the introduction of closed material cycles based on the differentiation strategy, higher material...