Viscoelastic Properties of Fresh Cement Paste to Study the Flow Behavior
M. Choi, Kyoungsoo Park, Taekeun Oh
Jun 28, 2016
Citations
29
Citations
Journal
International Journal of Concrete Structures and Materials
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Key Takeaway Key Takeaway: The study reveals that the viscoelastic properties of cement paste play a crucial role in determining the flow behavior of concrete during pumping, with varying mineral admixtures affecting the lubrication layer's properties.
Abstract
During concrete pumping, the migration and redistribution of particles occur in a pipe and the lubrication layer that forms between the bulk concrete and the pipe wall is the governing factor determining the flow behavior. In order to identify flow behavior of pumping, in this study, the viscoelastic properties related to the microstructural behavior of a flocculated suspension were examined by using dynamic oscillatory measurements. Cement paste is assumed to be a constituent material of the lubrication layer and ten cases of mixing design are employed by changing the proportions of mineral admixtures. The relationship between the yield stress obtained from the steady shear test and the dynamic modulus resulted from the oscillatory shear measurement was derived and the implications of the correlation are discussed. Moreover, based on the investigation of the viscoelastic properties with oscillatory measurements, the initial behavior of pumped concrete was analyzed systematically.