Article (Scientific journals)
Influence of fine recycled concrete aggregates on the properties of mortars
Zhao, Zengfeng; Remond, Sébastien; Damidot, Denis et al.
2015In Construction and Building Materials
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Keywords :
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
Publication date :
18 February 2015
Journal title :
Construction and Building Materials
ISSN :
0950-0618
eISSN :
1879-0526
Publisher :
Elsevier, Amsterdam, Netherlands
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 01 July 2016

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