Article (Scientific journals)
Use of grinded hardened cement pastes as mineral addition in mortars
Bouarroudj, Mohamed Elkarim; Remond, Sébastien; Bulteel, David et al.
2021In Journal of Building Engineering, 101863
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Keywords :
effective water; mineral addition; recycled concrete aggregate; water absorption; porosity
Abstract :
[en] Recycled Concrete Aggregates (RCA) are not enough used in the construction sector due to their high porosity and water absorption capacity. Fine particles which are composed of large amounts of attached hardened cement paste are even more difficult to valorize, while they could be used as mineral admixture in mortar or concrete. The objective of this work is to find a recovery track for this material as mineral addition. The use of a porous powder as mineral admixture in cementitious mortars raises the question of the effective water definition in such systems. Two powders are used, the first one is a grinded hardened cement paste (porous), and the second one is a limestone filler (non-porous). A comparison of the hydration degree, porosity, fresh, and hardened behaviors between cement pastes and mortars manufactured with the two powders is carried out. The results show that the porosity of the grinded hardened cement paste has an impact on the properties of cementitious materials. Depending on the studied properties (fresh or hardened properties), the substitution of cement by the porous powder could be done with, or without taking into account the water absorption. Taking into account the water absorption allows maintaining the fluidity of the mixture but decreases significantly the compressive strength for cement replacement percentages larger than 20%.
Disciplines :
Civil engineering
Author, co-author :
Bouarroudj, Mohamed Elkarim ;  Université de Liège - ULiège > Doct. sc. ingé. & techno. (archi., génie civ. - paysage)
Remond, Sébastien;  Polytech'Orléans
Bulteel, David;  IMT Lille Douai
Potier, Guillaume;  IMT Lille Douai
Michel, Frédéric ;  Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil
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 :
Use of grinded hardened cement pastes as mineral addition in mortars
Publication date :
2021
Journal title :
Journal of Building Engineering
eISSN :
2352-7102
Publisher :
Elsevier, Oxford, United Kingdom
Volume :
101863
Peer reviewed :
Peer Reviewed verified by ORBi
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
Available on ORBi :
since 15 October 2020

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