Article (Scientific journals)
Valorization of Fine Recycled Aggregates Contaminated with Gypsum Residues: Characterization and Evaluation of the Risk for Secondary Ettringite Formation
Colman, Charlotte; Bulteel, David; Remond, Sébastien et al.
2020In Materials, 13, p. 4866
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Keywords :
fine recycled aggregates; secondary ettringite formation; construction and demolition waste; sulfate attack
Abstract :
[en] Fine recycled aggregates (FRA) (0/4 mm) are up to now not valorized on a high enough level because of characteristics like an elevated water absorption, higher fines content, and the presence of contaminations. Leftover gypsum residues from the construction site can cause internal sulfate attack when FRA are incorporated into new structures. Concern about this deteriorating reaction plays an important role in the rejection of FRA. In this study, samples of FRA from different recycling centers were characterized and incorporated into mortars. They were then subjected to swelling tests in order to evaluate the development of sulfate attack. Reference materials with different amounts of sulfates were used as a comparison. Results showed a variable sulfate content in industrial FRA, depending heavily on the source of the materials. In all but one case, the total amounts surpassed the acceptable sulfate contents specified in the European standard EN 206, meaning the FRA would be rejected for reuse in concrete. Nevertheless, swelling tests demonstrated that these contamination levels did not pose a risk for sulfate attack. These results indicated that the incorporation of FRA leads to acceptable mechanical performances and that the sulfate limit could be reviewed to be less strict.
Disciplines :
Civil engineering
Author, co-author :
Colman, Charlotte ;  Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil
Bulteel, David;  IMT Lille Douai
Remond, Sébastien;  Université d'Orléans
Zhao, Zengfeng ;  Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil
Courard, Luc  ;  Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil
Language :
English
Title :
Valorization of Fine Recycled Aggregates Contaminated with Gypsum Residues: Characterization and Evaluation of the Risk for Secondary Ettringite Formation
Publication date :
2020
Journal title :
Materials
eISSN :
1996-1944
Publisher :
MDPI, Basel, Switzerland
Volume :
13
Pages :
4866
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
VALDEM
Funders :
Interreg France-Wallonie-Vlaanderen [BE]
Available on ORBi :
since 06 November 2020

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