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Influence of seawater and blast furnace cement employment on recycled aggregate concretes’ properties
Etxeberria Larrañaga, Miren; Gonzàlez Corominas, Andreu; Pardo Tràfach, Patricia
Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental; Universitat Politècnica de Catalunya. ATEM - Anàlisi i Tecnologia d'Estructures i Materials; Universitat Politècnica de Catalunya. GIOPACT - Grup de recerca d'Igualtat d'Oportunitats en l'Arquitectura, la Ciència i la Tecnologia
Recycled aggregates of mixed composition (MRA) may exhibit great variability in their properties, which in turn reduces their applicability. This study intends to extend the use of MRA in a broadened scope of applications by producing recycled aggregate concretes (RAC), which were mixed using two different types of cement, ordinary Portland cement and cement incorporating blast-furnace slag, and two types of water, fresh and seawater. The testing programme included analyses of the properties of concrete in its fresh (setting time and plastic shrinkage) and hardened state (physical, mechanical and drying shrinkage). The results showed that all of the physical and several of the mechanical properties as well as drying shrinkage were negatively influenced by the use of MRA. In contrast, however, the plastic shrinkage and flexural strength were improved. The use of seawater improved the mechanical properties, reduced setting time and increased drying shrinkage, however, it was found that the cement type was more influential on most of the properties. The use of seawater and cement with blast-furnace slag improved the performances of the RAC.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigó
Aggregates (Building materials)--Recycling
Recycled aggregate concrete
Blast furnace slag cement
Plastic shrinkage
Drying shrinkage
Àrids (Materials de construcció) -- Reciclatge

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