Using creep and recovery to study flow behavior of fresh cement paste
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Abstract A controlled stress rheometer has been used to determine the creep and recovery behavior of flocculated cement pastes. The behavior was found to depend on the level of applied stress. At a lower applied stress, the creep curve of each paste was characteristics of a nonlinear viscoelastic solid, with an instantaneous strain superimposed on an elastic strain; the recovery, on the other hand, was characteristics of a viscoelastic liquid, with little or no instantaneous strain, but some retarded strain and a substantial unrecovered strain. At a higher applied stress the behavior was strikingly different. In this case, the behavior was characteristics of a viscous liquid, with a nearly linear increase in strain throughout the duration of the stress and no recovery when the stress was released. This transition from solid-like behavior to liquid-like behavior occurred over a very narrow stress increment, and the transition stress corresponded to the yield stress estimated from flow curves and from oscillatory shear measurements.
[1] Leslie J. Struble,et al. USE OF OSCILLATORY SHEAR TO STUDY FLOW BEHAVIOR OF FRESH CEMENT PASTE , 1993 .
[2] A. Zosel. Rheological properties of disperse systems at low shear stresses , 1982 .
[3] R. Buscall,et al. Viscoelastic properties of strongly flocculated polystyrene latex dispersions , 1986 .
[4] Phillip Frank Gower Banfill,et al. The rheology of fresh concrete , 1983 .