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    Expansion due to alkali-silica reaction of ferronickel slag fine aggregate in OPC and blended cement mortars

    241454_241454.pdf (981.6Kb)
    Access Status
    Open access
    Authors
    Saha, A.
    Sarker, Prabir
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Saha, A. and Sarker, P. 2016. Expansion due to alkali-silica reaction of ferronickel slag fine aggregate in OPC and blended cement mortars. Construction and Building Materials. 123: pp. 135-142.
    Source Title
    Construction and Building Materials
    DOI
    10.1016/j.conbuildmat.2016.06.144
    ISSN
    0950-0618
    School
    Department of Civil Engineering
    URI
    http://hdl.handle.net/20.500.11937/30004
    Collection
    • Curtin Research Publications
    Abstract

    About 14 tonnes of granulated ferronickel slag (FNS) is produced as a by-product in the production process of 1 tonne of ferronickel. The physical properties of FNS are suitable for its use as fine aggregates in concrete. This paper presents a study on the expansion due to alkali-silica reaction (ASR) of mortar bars containing different percentages of FNS aggregates originated from garnierite ore. Accelerated mortar bar test (AMBT) was performed to measure the expansion of the samples. FNS was found to be reactive in Portland cement mortar according to the AMBT results. Class F fly ash and ground granulated blast furnace slag (GGBFS) were used as the ASR mitigating measures of the FNS aggregate. Experimental results show that the use of GGBFS was unable to reduce expansion to the required level. However, the use of 30% class F fly ash as a supplementary cementitious material was found to be effective in reducing the 21-day ASR expansion below 0.3% required by the Australian Standard. Observations by scanning electron microscopy confirmed the effectiveness of fly ash in mitigation of the ASR products of FNS aggregates.

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