Performance of recycled concretes exposed to sulphate soil for 10 years

•Recycled coarse aggregates obtained from two different crushed waste concrete.•Recycled concretes with variable content of recycled coarse aggregate.•Recycled concretes with and without specific features against sulphate attack.•Concretes exposed to sodium sulphate soil for more than 10 years.•No m...

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Bibliographic Details
Published in:Construction & building materials 2016-01, Vol.102, p.714-721
Main Authors: Zega, C.J., Coelho Dos Santos, G.S., Villagrán-Zaccardi, Y.A., Di Maio, A.A.
Format: Article
Language:English
Subjects:
Analysis
Building materials
Chemical properties
Concrete
Durability
Recycled concrete
Service conditions
Service life
Sodium sulfate
Sulphate attack
Sulphate soil
Waste management
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Summary:•Recycled coarse aggregates obtained from two different crushed waste concrete.•Recycled concretes with variable content of recycled coarse aggregate.•Recycled concretes with and without specific features against sulphate attack.•Concretes exposed to sodium sulphate soil for more than 10 years.•No major influence of the RCA content on the durability of concrete was determined. Recycled aggregate concretes, particularly those made with crushed concrete in replacement of the natural coarse aggregate, have been increasingly used in the last decades. Although compressive strength is not affected by the replacement of conventional coarse aggregates by recycled coarse aggregates (RCA), there is still some disagreement regarding their durable performance, particularly when they are exposed to severe conditions. This study evaluates the performance of recycled concretes made with different RCA contents (25%, 50%, 75% and 100%) exposed to sulphate soil for more than 10 years. Concretes designed with and without provisions for durability to sulphate attack were exposed. The specimens were half buried in sulphate soil and their condition was periodically assessed by visual inspection, weight loss and dynamic modulus of elasticity. Additionally, the extent of the attack on mortar–coarse aggregates interfaces was studied by stereomicroscopy and optical microscopy. Results to date indicate similar performances for recycled aggregate concretes and natural aggregate concretes with the same compressive strength level, even for a 100% RCA content.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2015.11.025