Determination of dispersion efficiency of cement suspensions by method of centrifugation

Abstract

In this research, rheological parameters of cement suspensions modified with different doses of two types of superplasticizers (SPs) were evaluated with an alternative method of centrifugation. It was determined that the critical normal and shear stresses (yield values), and the water/solid ratio alter with the additive dose, the additive type as well and the magnitude of centrifugal forces. The results obtained reveal that the method of centrifugation might serve for determination of dispersing effectiveness of SPs and rheological parameters of suspensions in general.

The action principle of organic plasticizers in cement suspensions determined from centrifugation

“…These rates can be attained in rheometers and may allow for characterizing an impact of admixtures . In this study, rheological effectiveness of sulfonated melamine‐formaldehyde SP (MF) was derived from centrifugation, which represents an alternative to traditional rheological approaches . The results are presented through Figs.…”

“…Its volume responds to the volume of gaps (inter‐particle volume); the remaining amount of water is separated above the surface of the specimen. Accordingly, the proportion of the water/solid ratio ( W / S ) can be calculated using the following relationship : where m s , m l are masses of the solid and liquid phases, respectively, in the suspensions before centrifugation and m d represents a mass of the separated water (plasticizer solution) after centrifugation.…”

“…Critical value of normal stress (σ x ) is derived from compacting force, and Rebinders relation ( Eq . ) is used for calculation of critical shear stress (yield) τ . In Eq .…”

“…Its volume responds to the volume of gaps (inter-particle volume); the remaining amount of water is separated above the surface of the specimen. Accordingly, the proportion of the water/solid ratio (W/S) can be calculated using the following relationship [26]:…”