The Influence of Cement Particles Shape and Concentration on the Rheological Properties of Cement Slurry
Keywords:Cement, slurry, particles shape, concentration, yield stress, viscosity, viscometer, dilatancy
The results of the experimental investigation of the influence of various types of cements – Portland cement and ground granulated blast furnace slag cement (GGBS cement) on the cement slurries yield stress, viscosity and dilatancy are presented in the paper. Rheological properties of the cement slurries and cement particles shape and surface texture were tested. The dilatancy of the cement slurries was evaluated by the form of the flow curves and by the calculated dilatancy factor. It was established, that particles of slag cement are more angular, what have great influence on yield stress and viscosity of cement slurry. The yield stress of GGBS cement slurry is about 1.8 times and 1.6 times respectively greater than Portland cement slurry. The yield stress and viscosity of GGBS cement slurry increases about 2 times more than this of the slurry of Portland cement with increasing the cement volume concentration. The changes of the cement slurry viscosity and yield stress could be described by exponential equation, which must be modified with the coefficients, depending on cement particles shape and volumetric distribution. The values of these coefficients for the Portland cement and slag cement were determined during this investigation.
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