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  • Microstructural analysis of recycled aggregate concrete produced from two-stage mixing approach

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    Author(s)
    W.Y. Tam, Vivian
    Gao, X.
    Tam, C.
    Griffith University Author(s)
    Tam, Vivian WY.
    Year published
    2005
    Metadata
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    Abstract
    Owing to the shortage of space for land reclamation in Hong Kong, it is difficult to dispose of tons of masonry waste generated daily from construction activities. Adoption of recycled aggregate from concrete waste thus becomes a burning issue. The Hong Kong SAR Government has set up a recycling plant in Tuen Mun Area 38 aiming at turning concrete waste into recycled aggregate with a practice note and specifications issued for controlling the quality of recycled aggregate. However, the use of recycled aggregate concrete to high grade applications is rarely reported because of its poorer compressive strength and high variability ...
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    Owing to the shortage of space for land reclamation in Hong Kong, it is difficult to dispose of tons of masonry waste generated daily from construction activities. Adoption of recycled aggregate from concrete waste thus becomes a burning issue. The Hong Kong SAR Government has set up a recycling plant in Tuen Mun Area 38 aiming at turning concrete waste into recycled aggregate with a practice note and specifications issued for controlling the quality of recycled aggregate. However, the use of recycled aggregate concrete to high grade applications is rarely reported because of its poorer compressive strength and high variability in mechanical behavior. This paper proposes a new approach in mixing concrete, namely "two-stage mixing approach (TSMA)", intended to improve the compressive strength for recycled aggregate concrete and hence lower its strength variability. Based upon experimental works, improvements in strength to recycled aggregate concrete were achieved. The effect can be attributable to the porous nature of the recycled aggregate and hence the pre-mix process can fill up some pores and cracks, resulting in a denser concrete, an improved interfacial zone around recycled aggregate and thus a higher strength when compared with the traditional mixing approach.
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    Journal Title
    Cement and Concrete Research
    Volume
    35
    Issue
    6
    Publisher URI
    http://www.elsevier.com/wps/find/journaldescription.cws_home/352/description#description
    DOI
    https://doi.org/10.1016/j.cemconres.2004.10.025
    Copyright Statement
    © 2005 Elsevier. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Chemical Engineering
    Civil Engineering
    Building
    Publication URI
    http://hdl.handle.net/10072/16698
    Collection
    • Journal articles

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