Fine recycled concrete aggregates; Water absorption; Granular class; Mechanical property; Interfacial transition zone
Abstract :
[en] Fine recycled concrete aggregates (FRCA) also called recycled sand, having particle sizes smaller than
5 mm, are essentially composed of mortar and hardened cement paste. Therefore they induce a large
water demand which makes them hard to recycle into mortar and concrete. In this paper, the properties
of mortars containing FRCA have been studied, including fresh properties, mechanical properties and
interfacial transition zone (ITZ) microstructure.
The influence of saturation state of FRCA (dried or saturated) on the properties of mortars of identical
compositions has first been studied. The results showed that the slump of mortars containing dried FRCA
is always larger than that of mortars containing saturated FRCA. Indeed, in the case of dried FRCA, the
theoretical amount of absorbed water is added at the beginning of mixing leading to a temporary increase
of the initial efficient W/C ratio and volume of paste, leading to a better workability before its absorption
into FRCA. On the contrary, the absorbed water in saturated FRCA is not readily available and thus cannot
contribute to increase the initial efficient W/C ratio. Moreover, the compressive strength of mortars containing
dried FRCA is always larger than that of mortars made with saturated FRCA, which is attributed to
a thinner interfacial transition zone improving its mechanical properties. The influence of the fraction of
recycled sand and of the granular class of recycled sand on the mechanical properties of mortars has then
been studied with saturated FRCA. The compressive strength of mortars decreases quasi linearly as the
replacement percentage of recycled sand increases. Moreover, it is shown that the finer fraction of recycled
sand (0/0.63 mm) has the worse effect on the mechanical properties of mortars.
Disciplines :
Civil engineering
Author, co-author :
Zhao, Zengfeng ; Université de Liège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil
Remond, Sébastien; Ecole des Mines de Douai - EMD > Civil and Environmental Engineering Department
Damidot, Denis; Ecole des Mines de Douai > Civil and Environmental Engineering Department
Xu, Weiya; Hohai University > Geotechnical Research Institute
Language :
English
Title :
Influence of fine recycled concrete aggregates on the properties of mortars
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