Internal sulfate attack in mortars containing contaminated fine recycled concrete aggregates

[en] Internal sulfate attack can be caused by the gypsum residues present in fine recycled aggregates (FRA). Asopposed to the better known external sulfate attack or Delayed Ettringite Formation (DEF), the sulfates inthis context are provided by a gypsum contamination of the aggregates. Mortars made with contami-nated FRA were subjected to different conditions, to assess which parameters had an influence on the sul-fate attack reaction. Their mechanical properties and microstructure are investigated. Results showedthat gypsum content, porosity, temperature and alkalinity influenced the consequences of sulfate attack.However, the gypsum size distribution and cement type did not.

Disciplines :

Civil engineering

Author, co-author :

Colman, Charlotte ; Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil

Bulteel, David

Thiery, Vincent

Rémond, Sébastien

Michel, Frédéric ; 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 :

Internal sulfate attack in mortars containing contaminated fine recycled concrete aggregates

Publication date :

2021

Journal title :

Construction and Building Materials

ISSN :

0950-0618

eISSN :

1879-0526

Publisher :

Elsevier, Amsterdam, Netherlands

Volume :

272

Peer reviewed :

Peer Reviewed verified by ORBi

Name of the research project :

Valdem

Funders :

Interreg France-Wallonie-Vlaanderen

Available on ORBi :

since 18 May 2020

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