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    Bond strength between corroded steel reinforcement and recycled aggregate concrete

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    Publication date
    2019-06
    Author
    Alhawat, Musab M.
    Ashour, Ashraf F.
    Keyword
    Recycled coarse aggregat
    Corrosion
    Bond strength
    Embadment length
    Steel bar size
    Pull-out test
    Rights
    © 2019 Institution of Structural Engineers. Published by Elsevier Ltd. All rights reserved. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    This paper investigates the bond performance of recycled coarse aggregate (RCA) concrete with un-corroded/corroded reinforcing steel bars, with the main parameters being RCA content, corrosion level, bar diameter and embedment length. For this purpose, 60 pull-out specimens containing different percentages of RCA (i.e. 0%, 25%, 50% and 100%) and steel bars of two diameters (12 and 20 mm) and different embedment lengths were tested. In order to establish various levels of corrosion, specimens were exposed to an electrochemical corrosion for 2, 5, 10 and 15 days. The bond strength between RAC concrete and un-corroded/corroded steel are compared to current codes and equations proposed by other researchers. Experimental results showed that larger corrosion rate of steel bars was observed with the increase of the replacement level of RCA due to its high porosity and water absorption. The use of RCA had a slight influence on bond strength for un-corroded specimens compared to that obtained from conventional concrete. Furthermore, the bond strength of RCA concrete was strongly affected by corrosion products; bond strength slightly enhanced for up to about 2% corrosion rate, and then significantly decreased as the corrosion time further increased, similar to that of conventional concrete. However, the rate of bond degradation between RCA concrete and corroded steel bars was much faster than that observed in corroded conventional concrete.
    URI
    http://hdl.handle.net/10454/16849
    Version
    Accepted manuscript
    Citation
    Alhawat MM and Ashour AF (2019) Bond strength between corroded steel reinforcement and recycled aggregate concrete. Structures. 19: 369-385.
    Link to publisher’s version
    https://doi.org/10.1016/j.istruc.2019.02.001
    Type
    Article
    Collections
    Engineering and Informatics Publications

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