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    Effects of metakaolin on nanomechanical properties of cement paste

    Access Status
    Fulltext not available
    Authors
    Barbhuiya, Salim
    Chow, PengLoy
    Date
    2015
    Type
    Book Chapter
    
    Metadata
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    Citation
    Barbhuiya, S. and Chow, P. 2015. Effects of metakaolin on nanomechanical properties of cement paste, in Calcined Clays for Sustainable Concrete: Proceedings of the 1st International Conference on Calcined Clays for Sustainable Concrete, pp. 459-466. Springer: Dordrecht.
    Source Title
    Calcined Clays for Sustainable Concrete
    DOI
    10.1007/978-94-017-9939-3_57
    ISBN
    978-94-017-9939-3
    ISSN
    2211-0844
    School
    Department of Civil Engineering
    URI
    http://hdl.handle.net/20.500.11937/14172
    Collection
    • Curtin Research Publications
    Abstract

    Metakaolin (MK) is a pozzolanic material, which is a dehydroxylated form of the clay mineral kaolinite. It is obtained by calcination of kaolinite clay at a temperature between 500 °C and 800 °C. In cement matrix, MK reacts with Ca(OH)2, to produce calcium silicate hydrate (CSH) gel. MK also contains alumina that reacts with Ca(OH)2 to produce additional alumina-containing phases, including C4AH13, C2ASH8 and C3AH6. This research aims to provide a better understanding of the effects of MK on the nanomechanical properties of the main phases present within the cement paste. Two different mixes were prepared, one control mix and the other one with 10 % MK (by cement weight). A constant water-binder ratio of 0.4 was used for both the mixes. Fraction volumes determined from nanoindentation testing show an increase in the amounts of high-density CSH at the cost of low-density CSH gel in cement pastes containing 10 % MK.

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