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Author(s): S. Liebezeit, U. Palzer, A. Müller
Paper category: Proceedings
Book title: IV International Conference Progress of Recycling in the Built Environment
Editor(s): Isabel M. Martins, Carina Ulsen, Yury Villagran
e-ISBN: 978-2-35158-208-4
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 62-69
Total Pages: 08
Language : English

Abstract: Buildings or structures consist of materials that are joined to form functional composites to
which a wide variety of “surface coatings” is added. Debonding of such composites is
necessary to ensure high-quality, material-specific recycling processes. This paper describes
tests of the debonding behavior of gypsum plaster and tiles that were attached to various types
of concrete or wall materials such as brickwork, calcium silica blocks, or autoclaved aerated

concrete. Selective heating with subsequent bond failure was achieved by exposing the inter-
facial layer of the materials to microwave-active substances. In all specimens subjected to this

process, the finishing material was successfully separated from its base by microwave
heating. No debonding was achieved in specimens without switching layer. Laboratory results
were confirmed by tests performed using an in-plant demonstrator unit. In these tests, large
fragments of gypsum plaster detached from the actual wall materials, which remained
undamaged. Tiles also lost their adhesive bond to their base without damaging the latter.

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

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