Time-dependent behaviour of structural concrete made with recycled coarse aggregates. Creep and shrinkage

•Time-dependent behaviour of recycled concrete (0%, 20%, 50% and 100%) was analysed.•Creep and shrinkage increase as the content of recycled coarse aggregate rises.•Internal curing effect influences time-dependent properties of recycled concrete.•Proposals to predict shrinkage and creep coefficient...

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Bibliographic Details
Published in:Construction & building materials 2016-09, Vol.122, p.95-109
Main Authors: Seara-Paz, Sindy, González-Fonteboa, Belén, Martínez-Abella, Fernando, González-Taboada, Iris
Format: Article
Language:English
Subjects:
Analysis
Concrete
Creep
Creep coefficient
Internal curing
Mechanical properties
Recycled concrete
Shrinkage
Specific creep
Structural concrete
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Summary:•Time-dependent behaviour of recycled concrete (0%, 20%, 50% and 100%) was analysed.•Creep and shrinkage increase as the content of recycled coarse aggregate rises.•Internal curing effect influences time-dependent properties of recycled concrete.•Proposals to predict shrinkage and creep coefficient of RC were suggested.•This leads to the design of RC with the same reliability as conventional concrete. This work is focused on studying the time-dependent properties of recycled concrete, especially shrinkage and creep behaviour. For said purpose, two series of concretes (water to cement ratios of 0.50 and 0.65) were designed with different replacement percentages of recycled coarse aggregate (0%, 20%, 50% and 100%). The experimental program consisted of studying basic properties and time-dependent shrinkage and creep up to 1000days. The results showed that shrinkage and creep strains increase with the replacement percentage, and the use of pre-saturated recycled aggregates leads to different time-dependent development of shrinkage and creep strains at early ages due to the internal curing effect. Finally, a function to predict recycled concrete shrinkage and creep coefficients was adjusted according to the content of recycled aggregates and concrete age.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2016.06.050