WATER MIGRATION DURING MIXING OF RECYCLED AGGREGATE CONCRETE

Author(s): Eliane Khoury, Bogdan Cazacliu, Sébastien Remond
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: 349-356
Total Pages: 08
Language : English

Abstract: Intrinsic characteristics of recycled concrete aggregates (RCA) make difficult to establish the
real effective water level when these aggregates are used to produce new concrete. It is shown
here that the exchange of water between the recycled aggregate and the new concrete mixture
during the mixing is more complex than generally considered. The water can get into or get
out from the RCA, depending on their initial level of moisture. There are cases were the
direction of the water migration change at different stages of the new concrete mixing.
Therefore, the level of the effective water decrease and/or increase during the mixing and
tends to stabilize once the uniform new concrete is obtained. The presented experiments
analyse the influence on the water migration kinetics during mixing and on the level of
stabilization of the effective water at the end of the mixing, of, on the one hand, the initial
moisture of the RCA and of the type of pores filled with water in these aggregate, and, on the
other hand, of the total water in the new concrete mixture.

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