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LIGHTWEIGHT CONCRETE WITH RECYCLING AGGREGATES MADE FROM MASONRY RUBBLE AND RUBBLE-CLAY MIXTURES



Author(s): K. Rübner, A. Schnell, T. Ihlenfeldt, M. Vöge
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: 323-331
Total Pages: 09
Language : English


Abstract: Structural lightweight concrete is a construction material composed primarily of lightweight
aggregates (LWA), cement and water. Most LWA are produced by thermal treatment of
natural raw materials such as clay and shale today. In addition to the high energy costs
thereby incurred, the availability of suitable raw materials is limited. An alternative is the use
of recycling LWA made from mineral construction and demolition waste. Recycling LWA
made from masonry rubble and rubble-clay mixtures were studied in two different research
projects. The technology pursues the idea of feedstock recycling, which means the recycling
is based on the chemical and mineralogical composition of the masonry rubble and clay. The
recycling LWA are produced in a multistage manufacturing process by thermal hardening in
laboratory and pilot scale. Their particle bulk densities and particle strengths vary between
600 and 2000 kg/m3 and 1.5 and 13 MPa, respectively. Their equivalence to traditional LWA
was proven in comprehensive tests of the aggregates themselves as well as the mortars and
concretes made therefrom. Our contribution reports on the results of the characterization of
the recycling aggregates compared to expanded clays and the studies on LWA concretes.


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


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