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    Plastic Concrete Reuse Using Extended Set-Retarding Admixtures

    167391_41863_63555.pdf (574.0Kb)
    Access Status
    Open access
    Authors
    Mali, Sarvesh
    Ahmed, Shaikh
    Nikraz, Hamid
    Date
    2011
    Type
    Conference Paper
    
    Metadata
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    Citation
    Mali, Sarvesh and Ahmed, Shaikh Faiz Uddin and Nikraz, Hamid. 2011. Plastic Concrete Reuse Using Extended Set-Retarding Admixtures, Proceedings of the Concrete 2011 Conference, Oct 12 2011. Perth, WA: The Concrete Institute of Australia.
    Source Title
    Proceedings of the CONCRETE 2011 Conference
    Source Conference
    CONCRETE 2011 Conference
    School
    Department of Civil Engineering
    Remarks

    Copyright © 2011 The Concrete Institute of Australia. The Concrete Institute of Australia website can be located at: http://www.concreteinstitute.com.au/

    URI
    http://hdl.handle.net/20.500.11937/21451
    Collection
    • Curtin Research Publications
    Abstract

    This paper reports a preliminary experimental study on the effect of extended setretarding admixture or ‘stabiliser’ on the plastic and hardened properties of grouts and concretes containing general purpose Portland cement, blended cement and low heat cement. The effect of stabiliser on efflux time or ‘flow time’ of GP cement grout was studied and the dosage required to achieve an efflux time of 35 seconds was estimated. The results showed a linear relationship with increasing stabiliser dosage extending the holding time of the grout. The effect of stabiliser on the timing and measure of peak hydration temperature was then assessed and the results showed that for GP cement and GB cementitious grouts, peak temperatures were lower after adding stabiliser, and for all three grouts the time to peak hydration was significantly increased. Finally, the effect of stabiliser on the plastic and hardened properties of fresh concrete, stabilised concrete, and a blend of fresh and stabilised concrete was assessed. The results showed that the initial one hour slumps and the final slumps of the blended concretes were all within tolerance. The results also showed that adding stabiliser to the concretes did not a significantly reduce compressive strength when compared to the original, non-stabilised concretes.

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