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    Influence of Type and Replacement Level of Recycled Aggregates on Concrete Properties.

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    Publication date
    2008
    Author
    Yang, Keun-Hyeok
    Chung, H-S.
    Ashour, Ashraf F.
    Keyword
    Recycled aggregate; Strength; Water absorption; Concrete; Properties
    Rights
    © 2008 ACI. Reproduced in accordance with the publisher's self-archiving policy.
    Peer-Reviewed
    yes
    
    Metadata
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    Abstract
    Test results of nine recycled aggregate concretes and a control concrete using only natural aggregates are reported. The recycled aggregates used were classified into three different types according to their measured specific gravity and water absorption, namely, RG I for recycled coarse aggregate having a specific gravity of 2.53 and water absorption of 1.9%; RG III for recycled coarse aggregate having a specific gravity of 2.4 and water absorption of 6.2%; and RS II for recycled fine aggregate having a specific gravity of 2.36 and water absorption of 5.4%. The replacement levels of both recycled coarse and fine aggregates were 30, 50, and 100% in separate mixtures. Slump loss and the amount of bleeding with time were recorded for fresh concrete. Compressive and tensile strengths, moduli of rupture and elasticity, and unrestrained shrinkage strain were also measured for hardened concrete. The properties of fresh and hardened concrete tested, together with a comprehensive database reported in the literature, were evaluated with respect to the relative water absorption of aggregates combining the quality and volume of recycled aggregates used. In addition, the properties of hardened concrete with different replacement levels and quality of recycled aggregates were compared with the design equations of ACI 318-05 and empirical equations proposed by Oluokun for natural aggregate concrete, whenever possible. Test results clearly showed that the properties of fresh and hardened concrete containing recycled aggregates were dependent on the relative water absorption of aggregates. In addition, the moduli of rupture and elasticity of recycled aggregate concrete were lower than the design equations specified in ACI 318-05, when the relative water absorption of aggregates is above 2.5% and 3.0%, respectively.
    URI
    http://hdl.handle.net/10454/7768
    Version
    Accepted Manuscript
    Citation
    Yang KH, Chung HS and Ashour AF (2008) Influence of Type and Replacement Level of Recycled Aggregates on Concrete Properties. ACI Materials Journal, 105 (3): 289-296.
    Link to publisher’s version
    https://www.concrete.org/publications/internationalconcreteabstractsportal.aspx?m=details&ID=19826
    Type
    Article
    Collections
    Engineering and Informatics Publications

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