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Effect of Mechanically Treated Recycled Aggregates on the Long Term Mechanical Properties and Durability of Concrete
Authors:Konstantina Oikonomopoulou  Sokrates Ioannou  Pericles Savva  Maria Spanou  Demetris Nicolaides  Michael F. Petrou
Affiliation:1.Department of Civil and Environmental Engineering, University of Cyprus, 1678 Nicosia, Cyprus; (K.O.); (M.F.P.);2.Department of Civil Engineering, Abu Dhabi Men’s Campus Higher Colleges of Technology, Abu Dhabi 25026, United Arab Emirates;3.Latomia Pharmakas, 1066 Nicosia, Cyprus;4.Frederick Research Center, 1303 Nicosia, Cyprus; (M.S.); (D.N.)
Abstract:
The objective of this research was to study the effect of an optimal mechanical treatment method to reduce the mortar adhered on recycled aggregates (RCA) on the long-term mechanical properties and durability of concretes containing RCA at different replacement levels. It was found that concretes incorporating treated RCA exhibited sharper and more significant increase on 90- and 365-day compressive strengths than any other investigated mixture. The same mixtures also benefitted from a ‘shrinkage-controlling’ effect, where strains and mass losses were reduced by almost 15% and 10%, respectively, compared to the reference concrete. While sulfate resistance and carbonation resistance are predominantly defined by the hydration products available within the cement paste and not to a large extent by the aggregate type and quality, the incorporation of either treated or untreated RCA in concrete did not appear to expose RACs to significant durability threats.
Keywords:recycled concrete aggregates   recycled aggregate concrete   adhered mortar   mineral admixes   internal curing   mechanical treatment   mechanical properties   durability
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