Optimisation of rheological parameters and mechanical properties of superplasticised cement grouts containing metakaolin and viscosity modifying admixture

M. Sonebi, M. Lachemi, K.M.A. Hossain

    Research output: Contribution to journalArticle

    52 Citations (Scopus)

    Abstract

    The objective of this research was to optimise the rheological parameters, hardened properties, and setting times of cement grouts containing metakaolin (MTK), viscosity-modifying agent (VMA) and superplasticiser (SP). All mixes were made with water-to-binder ratio (W/B) of 0.40. The replacement of cement by MTK was varied from 6% to 20% (by mass), and dosages of SP and VMA were varied from 0.3% to 1.4%, and 0.01% and 0.06% (by mass of binder), respectively. Increased SP led to an increase in fluidity, reduction in flow time, plate cohesion, rheological parameters, and an increase in the setting times. Increased VMA demonstrated a reduction in fluidity, an increase in Marsh cone time, plate cohesion, yield stress, and plastic viscosity. Results indicate that the use of MTK increased yield stress, plastic viscosity, cohesion plate, and flow time due to the higher surface area associated with an increase in the water demand. MTK reduced mini-slump and setting times, and improved compressive strength.
    Original languageEnglish
    Pages (from-to)126-138
    Number of pages13
    JournalConstruction and Building Materials
    Volume38
    Early online date21 Sep 2012
    DOIs
    Publication statusPublished - Jan 2013

    Keywords

    • Metakaolin
    • Plastic viscosity
    • Superplasticiser
    • Viscosity modifying admixture
    • Yield stress

    ASJC Scopus subject areas

    • Civil and Structural Engineering
    • Building and Construction
    • Materials Science(all)

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