THE ROLE OF WASTE SEGREGATION ON THE PERFORMANCE OF STRUCTURAL CONCRETE USING CONSTRUCTION AND DEMOLITION WASTE AS COARSE AGGREGATE

Author(s): Pedro V. Salles; Conrado S. Rodrigues; Flávia S. J. Poggiali
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: 382-389
Total Pages: 08
Language : English

Abstract: The restricted use of recycled aggregates from construction and demolition waste (CDW) in
structural concrete in Brazil is, in part, a consequence of uncertainties on the aggregate
properties. As selective demolition is almost never adopted, the CDW aggregates are then
produced in a mixed form, without any segregation beyond sieving for particle size separation.
This study investigates the influence of CDW aggregates on the properties of structural concrete
when the natural gravel (from gneiss) are partially replaced by CDW aggregates that were
conditioned in three forms: mixed (as produced) and separated in red and grey particles. The
characterization of the CDW aggregates has shown that the red portion represents the worse
condition for aggregates replacement, as it is much more porous, permeable, and less dense. On
the other hand, the grey portion presented properties more compatible to those from the natural
aggregate. From the mechanical characterization and the deterioration tests, it was found that
partial replacement of natural gravel by CDW aggregates can be used in structural concrete.
The grey CDW and mixed CDW, up to 50% of replacement rate has shown to be more viable;
even considering the presence of red particles in mixed CDW.

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