Effect of temperature on the structure of paste slurry at low constant shear rate

Abstract

ABSTRACT The effect of temperature on the paste slurry structure under low constant shear rate was studied and the measurements of rheological curve were approached by means of the Brookfield R/S rheometer. The results showed that the distinction between the elastic, plastic and viscous properties of the paste slurry, the static yield stress, and dynamic yield stress were related to the shear rate. When the constant low shear rate was 0.05 s−1, the rheological curve of the paste slurry can effectively distinguish the elastic, plastic and viscous phases and can accurately test the static yield stress and dynamic yield stress, which better reflected the change characteristics of the paste slurry structure. When the temperature rose, the elasticity, plasticity, and viscosity of the paste slurry had enhanced, the initial shear stress and dynamic yield stress increased, the storage modulus and the static yield stress increased similarly. The plastic strain energy increased first and then decreased with increasing temperature. The time to reach the static yield stress was basically the same, independent of the temperature change, the time of reaching the dynamic yield stress increased with the increase of temperature. As the shearing continued, the time during the paste slurry structure reached the steady state was substantially equal and did not change with temperature.