Rheology and vibration of fresh concrete: Predicting the radius of action of poker vibrators from wave propagation

P. F G Banfill, M. A O M Teixeira, R. J M Craik

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    Abstract

    The compaction of fresh concrete by an internal poker vibrator has been analysed using closed-form solutions for the propagation of the shear and compressive waveforms, assuming that concrete conforms to the Bingham model. In the inner liquefied zone around the vibrator the flow is due to shear whereas in the outer unsheared zone propagation is due to compressive waves. The analysis gives a method of predicting the radial position at which the flow changes, which coincides with the radius of action of the vibrator. Theory and experiment agree well and confirm that the peak velocity of the vibration governs its efficacy, with radius of action increasing with increasing velocity. The radius of action increases with decreasing yield stress and with increasing plastic viscosity. The work offers the potential to optimise the design and use of vibrators. © 2011 Elsevier Ltd. All rights reserved.

    Original languageEnglish
    Pages (from-to)932-941
    JournalCement and Concrete Research
    Volume41
    Issue number9
    DOIs
    Publication statusPublished - 23 May 2011

    Keywords

    • Bingham model
    • Fresh concrete (A)
    • Rheology (A)
    • Vibration (A)

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