caa a22 4500 605466696 CHVBK 20210128100308.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00397-015-0839-x doi (NATIONALLICENCE)springer-10.1007/s00397-015-0839-x Time-resolved yield stress measurement of evolving materials using a creeping sphere [Elektronische Daten] [Alireza Kashani, John Provis, Ben van Deventer, Greg Qiao, Jannie van Deventer] Physicochemical phenomena influenced by aging or reaction can result in rheological changes across several orders of magnitude, but the classical rheometry methods available for analysis of concentrated suspensions can face challenges in correctly measuring the yield stress of aging/reacting (evolving) materials and need some precautions to enable precise measurement of the evolution of the yield stress with time. Here, a creeping sphere method has been applied to measure time-resolved yield stress; the force required to pull a solid sphere at very low velocity is used to calculate yield stress using previous analytical solutions for local flow of a creeping sphere in yield stress materials. The measured yield stress values agree well with the data recorded using vane-in-cup geometry for time-independent measurements using Carbopol gel. The creeping sphere is less affected by shear history because of the constantly changing shear region and therefore measures yield stress changes in evolving materials such as cement for a long time period in a single run, without altering ongoing structural network bond formation. Springer-Verlag Berlin Heidelberg, 2015 Rheology nationallicence Yield stress nationallicence Creeping sphere nationallicence Non-Newtonian fluids nationallicence Concentrated suspensions nationallicence Cement nationallicence Kashani Alireza Department of Chemical and Biomolecular Engineering, University of Melbourne, 3010, Parkville, VIC, Australia aut Provis John Department of Materials Science and Engineering, University of Sheffield, S1 3JD, Sheffield, UK aut van Deventer Ben Zeobond Pty. Ltd., P.O. Box 23450, 8012, Docklands, VIC, Australia aut Qiao Greg Department of Chemical and Biomolecular Engineering, University of Melbourne, 3010, Parkville, VIC, Australia aut van Deventer Jannie Department of Chemical and Biomolecular Engineering, University of Melbourne, 3010, Parkville, VIC, Australia aut Rheologica Acta Springer Berlin Heidelberg 54/5(2015-05-01), 365-376 0035-4511 54:5<365 2015 54 397 https://doi.org/10.1007/s00397-015-0839-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-015-0839-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kashani Alireza Department of Chemical and Biomolecular Engineering, University of Melbourne, 3010, Parkville, VIC, Australia aut NATIONALLICENCE 700 1- Provis John Department of Materials Science and Engineering, University of Sheffield, S1 3JD, Sheffield, UK aut NATIONALLICENCE 700 1- van Deventer Ben Zeobond Pty. Ltd., P.O. Box 23450, 8012, Docklands, VIC, Australia aut NATIONALLICENCE 700 1- Qiao Greg Department of Chemical and Biomolecular Engineering, University of Melbourne, 3010, Parkville, VIC, Australia aut NATIONALLICENCE 700 1- van Deventer Jannie Department of Chemical and Biomolecular Engineering, University of Melbourne, 3010, Parkville, VIC, Australia aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/5(2015-05-01), 365-376 0035-4511 54:5<365 2015 54 397