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  • Removal of cement mortar remains from recycled aggregate using pre-soaking approaches

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    Author(s)
    Tam, Vivian
    Tam, C.
    Le, Khoa
    Griffith University Author(s)
    Le, Khoa N.
    Tam, Vivian WY.
    Year published
    2007
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    Abstract
    With a rising tide of adoption of recycled aggregate (RA) for construction, investigation on ways to improve the quality of RA has been overwhelming. The adoption of RA brings benefits including savings in the limited landfill spaces and the use of natural resources. However, the poorer quality of RA often limits its utilization to low grade applications such as sub-grade activities, filling materials and low grade concrete. The major reason that affects the quality of RA is the large amount of cement mortar remains on the surface of the aggregate, resulting in higher porosity, water absorption rates and thus a weaker ...
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    With a rising tide of adoption of recycled aggregate (RA) for construction, investigation on ways to improve the quality of RA has been overwhelming. The adoption of RA brings benefits including savings in the limited landfill spaces and the use of natural resources. However, the poorer quality of RA often limits its utilization to low grade applications such as sub-grade activities, filling materials and low grade concrete. The major reason that affects the quality of RA is the large amount of cement mortar remains on the surface of the aggregate, resulting in higher porosity, water absorption rates and thus a weaker interfacial zone between new cement mortar and aggregates, which weakens the strength and mechanical performance of concrete made from RA. This paper attempts to study three pre-soaking treatment approaches; namely ReMortarHCl, ReMortarH2SO4 and ReMortarH3PO4 in reducing the mortar attached to RA. The results show that the behaviour of RA has improved with reduction in water absorption, without simultaneous exceeding the limits of chloride and sulphate compositions after the treatment. This work has also compared the compressive strength, flexural strength and modulus of elasticity of concrete made from the approaches, which shows marked improvements in quality when compared with those using traditional approaches.
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    Journal Title
    Resources, Conservation and Recycling
    Volume
    51
    Issue
    1
    Publisher URI
    http://www.elsevier.com/wps/find/journaldescription.cws_home/503358/description#description
    DOI
    https://doi.org/10.1016/j.resconrec.2006.05.012
    Copyright Statement
    © 2007 Elsevier. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Environmental Sciences
    Engineering
    Built Environment and Design
    Publication URI
    http://hdl.handle.net/10072/15025
    Collection
    • Journal articles

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