[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
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