UPGRADING OF MIXED MASONRY CONSTRUCTION AND DEMOLITION WASTE TO EXPANDED LIGHTWEIGHT AGGREGATES

Author(s): A. Mueller, S. Liebezeit, U. Palzer
Paper category: Proceedings
Book title: IV International Conference Progress of Recycling in the Built Environment
Editor(s): Isabel M. Martins, Carina Ulsen, Yury Villagran
ISBN:
e-ISBN: Isabel M. Martins, Carina Ulsen, Yury Villagran
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 315-322
Total Pages: 08
Language : English

Abstract: In the literature a large number of studies on the production of lightweight aggregates (LWA)
from different wastes is described. Construction and Demolition Waste (CDW) is missing in
this context nearly completely. The paper describes the methodology to figure out the
potential of different CDW as sources for expanded LWA – starting with thermal treatment of
a small number of raw granulates in a gradient kiln and ending with a burning in an electrical
heated rotary kiln. The materials come from diverse sources and have different compositions.
As expanding agent Silicon Carbide, SiC, is used. The lowest density of granulates that could
be produced was 300 kg/m3, the highest density was about 1990 kg/m3 if no expanding agent
was added. First considerations on the configuration of a production line in a technical scale
with a throughput capacity of 50.000 tons per year were carried out. The economy of the
proposed technology compared with expanded clay was estimated.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00