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    Volume 6, Issue 2 (July 2017)

    Special Issue Paper

    Stiffening Behaviors of Cement Pastes Measured by a Vibrational Viscometer

    (Received 17 September 2016; accepted 4 January 2017)

    Published Online: 2017

    CODEN: ACEMOAD

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    Abstract

    This study explores the stiffening behavior of cement pastes up to 30 min using a new vibrating-fork technique, in which the vibro-viscometer controls the electrical current to maintain a uniform vibrating amplitude of the sensor plate for approximately 0.2 mm at 30 Hz. The applied electrical current is related to the product of the apparent viscosity and the density. The viscosity evolutions of the cement pastes at water–cement ratios of 0.4, 0.5, and 0.6 in the presence or absence of high-range water-reducer admixtures (HRWRA) were compared using a rotational viscometer and a tuning-fork vibration viscometer. The results indicated that the viscosities increased with hydration time and decreased with admixture dosages. The vibration viscometer seems to have applied higher shear rates than the rotational viscometer during the early hydration so the viscosities measured by the vibration viscometer were always lower. However, the increases in the viscosity of the cement pastes, as measured by the vibration viscometer, were more stable than those measured by the rotational viscometer. In addition, the subtle increases in the paste viscosities during very early hydration were detected well by the vibration viscometer. The vibrating-fork technique has been proven to be a useful tool for characterizing microstructure changes in early cement pastes.

    Author Information:

    Chen, Chun-Tao
    Department of Civil and Construction Engineering, National Taiwan University of Science and Technology, Taipei,

    Lin, Chang-Wei
    Department of Civil and Construction Engineering, National Taiwan University of Science and Technology, Taipei,


    Stock #: ACEM20160061

    ISSN:2379-1357

    DOI: 10.1520/ACEM20160061

    Author
    Title Stiffening Behaviors of Cement Pastes Measured by a Vibrational Viscometer
    Symposium ,
    Committee C01