Abstract
Environmental concerns regarding Construction and Demolition Waste (CDW) and the introduction of a circular economy model, obligates the construction sector to incorporate Recycled Concrete Aggregates (RCA) in conventional concrete; nevertheless, RCAs have generally proven to decrease the overall characteristics due to their remnant mortar. Therefore, a mechanical treatment method was applied to RCA to partially remove the adhered mortar and improve Recycled Aggregate Concrete (RAC) properties. The main goal of this paper was to examine the combined effect of mechanically treated aggregates and internal curing (IC) method on the mechanical and durability characteristics of RAC. Several mixtures at 0.25 and 0.50 w/c ratio containing either untreated or mechanically treated RCA with various replacement percentages were cast and experimentally investigated. At the low w/c ratio, the incorporation of 25% untreated or mechanically treated RCA obtained the closest values compared to their corresponding reference mixture (0% RCA). The IC method proved highly effective in regard to chloride penetration since all values were significantly reduced regardless of the replacement percentage, w/c ratio and type of RCA. IC mixtures containing treated RCA experienced a notable decrease in drying shrinkage strain values compared to their reference mixtures.
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Acknowledgement
The Authors Would like to Express Their Sincere Gratitude to University of Cyprus for Internally Funding This Research with the Programme “GReen Concrete”. Special Thanks also to the Undergraduate Students at University of Cyprus Who Contributed to the Experimental Work, Especially Prodromos Pigiotis, Panagiotis Persianis, Charalambos Erotocritou, Panagiotis Demetriou and Maria Pavlou.
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Oikonomopoulou, K., Savva, P., Polydorou, T., Demetriou, D., Nicolaides, D., Petrou, M.F. (2023). Effect of Mechanically Treated and Internally Cured Recycled Concrete Aggregates on Recycled Aggregate Concrete. In: Ilki, A., Çavunt, D., Çavunt, Y.S. (eds) Building for the Future: Durable, Sustainable, Resilient. fib Symposium 2023. Lecture Notes in Civil Engineering, vol 349. Springer, Cham. https://doi.org/10.1007/978-3-031-32519-9_95
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