Article (Scientific journals)
Expansion of concrete by secondary ettringite formation, caused by fine recycled aggregates contaminated with gypsum
Colman, Charlotte; Bulteel, David; Elkarim, Bouarroudj Mohamed et al.
2022In Advances in Cement Research, 043, p. 1-25
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Keywords :
sulphate; C&DW; climate; ettringite; gypsum; expansion
Abstract :
[en] Recycled aggregates, and especially the fine (0/4 mm) fraction, are often contaminated with sulfates coming from gypsum residues on the demolition site. When these aggregates are used in concrete, the sulfates can induce internal sulfate attack which causes the expansion of concrete. Standard EN206 sets the water soluble sulfate limit at 0.2 % by weight of the aggregate but other studies suggest this limit could be safely increased. In addition to the sulfate content, other parameters like the porosity and alkalinity of a mix have been seen to influence the swelling results. In this study, the different proposed sulfate limits are evaluated on concrete made with 100 % fine recycled aggregates. It is also researched whether mixing parameters could change the swelling amount regardless of sulfate content. The results showed that the incorporation of fine recycled aggregates with sulfate contents up to 0.8 mass% is safe when combined with coarse natural aggregates. If coarse recycled aggregates are used, the sulfate content of fine recycled aggregates could reach up to 0.3 %. The swelling caused by these sulfate levels was not high enough to be influenced by porosity or alkalinity.
Disciplines :
Civil engineering
Author, co-author :
Colman, Charlotte
Bulteel, David;  IMT Lille Douai, Institut Mines-Télécom, Centre for Materials and Processes, Lille, France ; University of Lille, Institut Mines-Télécom, University of Artois, Junia, ULR 4515 - LGCgE - Laboratoire de Génie Civil et géoEnvironnement, Lille, France
Elkarim, Bouarroudj Mohamed;  University of Orléans, University of Tours, INSA CVL, LaMé, EA, France ; ECOCEM
Rémond, Sébastien;  University of Orléans, University of Tours, INSA CVL, LaMé, EA, France
Courard, Luc  ;  Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil
Language :
Title :
Expansion of concrete by secondary ettringite formation, caused by fine recycled aggregates contaminated with gypsum
Publication date :
19 December 2022
Journal title :
Advances in Cement Research
Publisher :
Thomas Telford Ltd.
Volume :
Pages :
Peer reviewed :
Peer Reviewed verified by ORBi
Development Goals :
11. Sustainable cities and communities
13. Climate action
Name of the research project :
VALDEM Solutions intégrées de valorisation des flux "matériaux" issus de la démolition des bâtiments : Approche transfrontalière vers une économie circulaire
Funders :
Interreg France-Wallonie-Vlaanderen [BE]
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since 18 August 2023


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