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    Residual strength of blended cement pastes and mortar exposed to elevated temperatures

    Access Status
    Fulltext not available
    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. Residual strength of blended cement pastes and mortar exposed to elevated temperatures. Electronic Journal of Structural Engineering. 16 (1): pp. 26-37.
    Source Title
    Electronic Journal of Structural Engineering
    ISSN
    1443-9255
    School
    Department of Civil Engineering
    URI
    http://hdl.handle.net/20.500.11937/54720
    Collection
    • Curtin Research Publications
    Abstract

    This paper presents the outcome of a series of tests to determine properties of blended cement pastes and mortar mixtures using Taguchi's design of experiment approach. Fly ash (FA), water to cementitious material ratio (w/c), superplasticiser (SP) and sand to cementitious material ratio (s/c) are the main parameters considered. Mixture samples were tested at varying temperatures up to 800oC. The ANOVA results and regression analysis show that an increase in FA content and w/c ratio lead to a decrease in the density of blended cement. For compressive strength development, an increase in FA content and s/c ratio decreased the compressive strength development. Within the tested levels of the parameters, the optimum mix to achieve the highest compressive strength of blended cement mixtures is 20% of FA content, 1.5 of s/c ratio, 0.35 of w/c ratio and 0.2% of SP. Increasing the content of FA and SP improved the overall residual strength, and the optimum mix design to achieve the highest residual strength is 20% of FA, 1.5 of s/c ratio, 0.35 of w/c ratio and 0.2 of SP. Based on all the test results, an empirical formula for predicting residual strength of blended cement paste and mortar is proposed.

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