TY - JOUR A1 - Ji, Y. A1 - Becker, S. A1 - Lu, Z. A1 - Mezhov, Alexander A1 - von Klitzing, R. A1 - Schmidt, Wolfram A1 - Stephan, D. T1 - Effect of resting time on rheological properties of glass bead suspensions: Depletion and bridging force among particles T2 - Journal of the American Ceramic Society N2 - The effect of resting time on the rheological properties of cement suspensions is generally explained by early formed structure and overconsumption of polycarboxylate superplasticizers (PCEs). 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 bead 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 changes correlate well with the increased yield stress. PB - Wiley online library CY - Weinheim KW - Depletion force KW - Ionic stregth KW - PCE KW - Rheology KW - Resting time PY - 2023 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/58719 AN - OPUS4-58719 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-587193 SN - 0002-7820 SP - 1 EP - 16 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany