TY - CHAP A1 - Lu, Z. A1 - Becker, S. A1 - Leinitz, Sarah A1 - von Klitzing, R. A1 - Schmidt, Wolfram A1 - Stephan, D. A2 - Mechtcherine, V. A2 - Khayat, K. A2 - Secrieru, E. T1 - Rheological properties of silica beads in the presence of different polymers and electrolyte T2 - Rheology and Processing of Construction Materials N2 - Properties of interstitial liquid phase in cement paste, including the species and concentrations of polymers and ion etc., play an important role for the rheological properties of cementitious materials. In order to better understand their effect, an inert model substance, spherical silica beads (SBs) with defined surface and granulometry were used in the presence of electrolytes (CaCl2) and/or different polymers, including polycarboxylate superplasticizer (PCE) and polyethylene glycol (PEG). It was found the presence of Ca2+ greatly increases the viscosity and yield stress of silica beads paste (SBP), which is proportional to the [Ca2+]. For the effect of PCE, the addition of PCE is beneficial to the flowability of SBP, but a high dosage of PCE leads to a reversal effect. Furthermore, the yield stress firstly increases and then decreases with increasing [Ca2+] under the same dosage of PCE. The addition of PEG always increases the yield stress of SBP, regardless of the ion concentration and the presence or not of PCE. PB - Springer KW - Rheological properties KW - Ions KW - Superplasticizer KW - Silica beads PY - 2019 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/49185 AN - OPUS4-49185 SN - 978-3-030-22565-0 SN - 978-3-030-22566-7 SN - 2211-0844 VL - 23 SP - 619 EP - 627 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany