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Poster (Scientific congresses and symposiums)
Toward the quantification of the cement paste content of fine recycled concrete aggregates by salicylic acid dissolution corrected by a theoretical approach
Zhao, Zengfeng; Remond, Sébastien; Damidot, Denis et al.
2015ICCC15 (14th International Congress on the Chemistry of Cement)
Peer reviewed
 

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Keywords :
concrete; salicylic acid; water absorption coefficient; recycling; cement paste; aggregates
Abstract :
[en] Recycled concrete aggregates (RCA) are mainly composed of an intimate mix between natural aggregates and cement paste and the complete separation between these two phases is difficult. Cement paste generally presents a much larger porosity than natural aggregates, the content and the physicochemical properties of cement paste therefore have a large influence on the properties of RCA. Any method seems to be adapted to the characterization of cement paste content (CPC) in fine recycled concrete aggregates (FRCA) especially for RCA containing calcareous aggregates. A simple method based on the dissolution of the cement paste in a solution of salicylic acid in methanol was specifically developed to estimate the cement paste content of RCA. Results showed that salicylic acid dissolution method can dissolve most phases of hardened Portland cement paste such as Portlandite, ettringite and C-S-H without dissolving siliceous and calcareous aggregates. The experimental results for two neat Portland cement pastes (white cement paste and grey cement paste) showed that the soluble fraction in salicylic acid (SFSA) was equal to the cement paste content for white cement and slightly lower for the grey cement. The SFSA was measured for different types of RCA. The RCA manufactured in the laboratory whose composition is fully known and three RCA manufactured from industrial crushing platforms have been characterized. Whatever RCA used in our study, SFSA varies almost linearly with the average particle size. A linear relationship was obtained between the water absorption coefficient and SFSA. This relationship allowed us to accurately determine the water absorption coefficient of the smallest granular class 0/0.63mm.
Disciplines :
Civil engineering
Author, co-author :
Zhao, Zengfeng ;  Université de Liège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil
Remond, Sébastien;  Ecole des Mines de Douai
Damidot, Denis;  Ecole des Mines de Douai
Courard, Luc  ;  Université de Liège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil
Language :
English
Title :
Toward the quantification of the cement paste content of fine recycled concrete aggregates by salicylic acid dissolution corrected by a theoretical approach
Publication date :
30 October 2015
Event name :
ICCC15 (14th International Congress on the Chemistry of Cement)
Event place :
Beijing, China
Event date :
13-16 October 2015
Audience :
International
Peer reviewed :
Peer reviewed
Funders :
CSC - China Scholarship Council [CN]
Available on ORBi :
since 12 May 2016

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