Effect of resting time on rheological properties of glass bead suspensions: Depletion and bridging force among particles

Abstract

Effect of resting time on rheological properties of cement suspension is generally explained by early formed structure and overconsumption of PCE superplasticizers. In this paper, we propose that the influence of resting time on the rheological properties is closely related to size variation of non‐absorbed PCE. To identify this, glass beads suspensions were prepared with various amounts of PCE and ionic solution, and their rheological properties were evaluated at various times. We found that the yield stress increases with time at higher PCE concentrations and higher ionic strength solutions. Adsorbed PCE during resting tends to bridge the particles rather than disperse them. In addition, it was found that hydrodynamic radius of PCE increased with resting time, and depletion forces resulting from non‐absorbed PCE size change correlate well with the increased yield stress.This article is protected by copyright. All rights reserved