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    Mechanical and micromechanical properties of alkali activated fly-ash cement based on nano-indentation

    Access Status
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    Authors
    Lee, H.
    Vimonsatit, Vanissorn
    Chindaprasirt, P.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Lee, H. and Vimonsatit, V. and Chindaprasirt, P. 2016. Mechanical and micromechanical properties of alkali activated fly-ash cement based on nano-indentation. Construction and Building Materials. 107: pp. 95-102.
    Source Title
    Construction and Building Materials
    DOI
    10.1016/j.conbuildmat.2015.12.013
    ISSN
    0950-0618
    School
    Department of Civil Engineering
    URI
    http://hdl.handle.net/20.500.11937/9477
    Collection
    • Curtin Research Publications
    Abstract

    © 2015 Elsevier Ltd. All rights reserved. This paper presents mechanical and micromechanical properties of alkali activated fly-ash cement (AAFA) based on statistical analysis with nano-indentation test. Mix proportions of AAFA are designed using Taguchi's approach. Four variables viz, silica fume (SF), sand to cementitious material ratio (s/c), liquid to solid ratio (l/s) and superplasticiser (SP) content were the parameters tested. Indentation elastic modulus, hardness and packing density are studied. The results show that the increase in sand has the greatest contribution to the increase in density. For compressive strength, normal paste without SF, sand and SP with l/s of 0.6 gives the highest strength and the increase in SF significantly contributes to the adverse effect on compressive strength. For the indentation data, the analysis using deconvolution technique confirms the four phases of reaction products of AAFA. The main phase is sodium aluminosilicate hydrate (N-A-S-H), which is over 40% of the volume fraction. The microporomechanics of AAFA paste and mortar also demonstrate the relationships between the N-A-S-H volume fraction and strength; and activation degree and strength.

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