USING RECYCLED CONCRETE SANDS IN NEW STRUCTURAL CONCRETE: A PRACTICAL APPROACH

Author(s): Jeroen Vrijders, Bram Dooms, Luc Boehme, Gerdi Goderis, Filip Props, Jean-Pierre Andries
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: 422-429
Total Pages: 08
Language : English

Abstract: In the past years, a lot of research was done and experience was gathered on the use of coarse
recycled concrete aggregates (CRCA) in concrete. Given the fact that often only the fraction 4
or 8 to 20 mm of high quality CRCA is used, leaves the fine RCA fraction 0 to 4 or 8 mm.
This recycled sand is supposedly of a better quality than normal crusher sand, since the intake
procedure to produce CRCA for new concrete requires a more specific selection of concrete
debris (e.g. only pure concrete, from roads, from prefabricated elements, ...).
Within the Sand2Sand project, that groups 4 frontrunner companies & 2 research institutes,
the possibilities to use the ‘high quality’ recycled sand in concrete for buildings are
investigated and tested in practice. Focus is put on quality assessment of the recycled sand
compared to other sands, development of suitable mixes for different concrete compositions
and evaluation of the applicability in real scale demonstration projects.
The paper also highlights some practical difficulties, e.g. on assessing water absorption and
density of recycled sands and developing a suitable mixing composition with variable
materials. The most important properties of fresh & hardened concrete are discussed.

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