Abstract
Extensive construction and demolition waste (CDW) is generated during the construction process. That waste is currently deposited in landfills. It is necessary to produce and employ mixed recycled aggregates (MRA) in low strength (up to 30 MPa) concrete elements. This study aimed to describe the properties (physical, mechanical and durability) of concrete made with treated (employing water glass, WG5, and silane admixture, Si6) MRA aggregate compared to untreated recycled concrete. Two types of MRA aggregates (with different amounts of ceramic particles) were employed. The concretes used 100% coarse and fine recycled aggregates with 300 kg of cement and an effective water/cement ratio of 0.50. These concrete mixes were suitable for use as 25 MPa concrete. The concrete produced with MRA aggregates with the WG5 surface treatment achieved the desired strength for reinforced concrete of 30–35 MPa. However, all the concretes obtained a low value of the elastic modulus. Although all the concretes manufactured with 100% recycled aggregate met the EHE requirements (Spanish Standard of Structural Concrete, EHE) regarding the depth of water penetration under pressure and relatively low carbonation coefficient, the drying shrinkage was high. However, the surface treatments of aggregate reduced recycled concrete shrinkage considerably.
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Acknowledgement
The authors wish to thank Hercal Diggers company for their interest and support. The authors also want to acknowledge the financial support of The Ministry of Science and Innovation CDTI Project.
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Etxeberria, M., Vintimilla, C. (2023). Influence of Treated Mixed Recycled Aggregates in Concrete Properties. In: Escalante-Garcia, J.I., Castro Borges, P., Duran-Herrera, A. (eds) Proceedings of the 75th RILEM Annual Week 2021. RW 2021. RILEM Bookseries, vol 40. Springer, Cham. https://doi.org/10.1007/978-3-031-21735-7_102
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DOI: https://doi.org/10.1007/978-3-031-21735-7_102
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