Influence of Squeezing Rate on Yield Stress and Viscosity of Fresh Mortar
In the present work, squeeze flow techniques were used to investigate the influence of squeezing rates on the yield stress of mortars in fresh state. The tested samples were prepared under similar conditions of room temperature and atmospheric pressure. The fresh mortars were tested at three squeezing rates (20 and 200mm/s) 15 minutes after mixing. The results show that the material’s yield stress increases with the increasing of the squeeze velocity. This increase is evident at low tensile speeds and is not obvious at high tack velocity. Elongational viscosity values increased as a result of the gap reduction for all the tested samples. However, when the squeeze speed was high, the strain rate increased because of the high displacement rates, a significant reduction in the mortar’s elongational viscosity was observed compared with those obtained when the squeeze speed was low. Despite that this behavior is associated with fluid-solid phase separation, which occurs for low displacement rates, these viscosity values actually represent the behavior of the material in practical situations when submitted to different velocities. The increase in the displacement rate of one order of magnitude caused a reduction in the viscosity of one order of magnitude.
P. F. G. Banfill, “Use of the ViscoCorder to study the rheology of fresh mortar,” Magazine of Concrete Research, vol. 42, no. 153, pp. 213–221, Dec. 1990, doi: 10.1680/macr.19220.127.116.11.
R. G. Pileggi, “Novel tools for the study and development of refractory castables,” (in Portugese), Ph.D. dissertation, Federal University of Sao Carlos, Sao Carlos, Brazil, 2001.
B. Belahcene, A. Mansri, and A. Benmoussat, “Investigation on the Rheological Behavior of Multigrade Oil under the Effect of Organic and Inorganic Impurities,” Engineering, Technology & Applied Science Research, vol. 4, no. 6, pp. 711–713, Dec. 2014.
V. T. Phan, “Influence of re-dispersible powder on the properties of mortars,” Journal of Materials and Engineering Structures, vol. 1, no. 1, pp. 2–10, Jan. 2014.
F. A. Cardoso, V. M. John, and R. G. Pileggi, “Rheological behavior of mortars under different squeezing rates,” Cement and Concrete Research, vol. 39, no. 9, pp. 748–753, Sep. 2009, doi: 10.1016/j.cemconres.2009.05.014.
K. Kardjilova, V. Vozarova, and M. Valah, “Influence of Temperature on Energetic and Rheological Characteristics of PLANTOHYD Bio Lubricants – a Study in the Laboratory,” Engineering, Technology & Applied Science Research, vol. 3, no. 3, pp. 424–428, Jun. 2013.
G. H. Meeten, “Yield stress of structured fluids measured by squeeze flow,” Rheologica Acta, vol. 39, no. 4, pp. 399–408, Aug. 2000, doi: 10.1007/s003970000071.
N. Ozkan, C. Oysu, B. J. Briscoe, and I. Aydin, “Rheological analysis of ceramic pastes,” Journal of the European Ceramic Society, vol. 19, no. 16, pp. 2883–2891, Dec. 1999, doi: 10.1016/S0955-2219(99)00054-0.
J. Engmann, C. Servais, and A. S. Burbidge, “Squeeze flow theory and applications to rheometry: A review,” Journal of Non-Newtonian Fluid Mechanics, vol. 132, no. 1, pp. 1–27, Dec. 2005, doi: 10.1016/j.jnnfm.2005.08.007.
O. H. Campanella and M. Peleg, “Squeezing Flow Viscosimetry of Peanut Butter,” Journal of Food Science, vol. 52, no. 1, pp. 180–184, Jan. 1987, doi: 10.1111/j.1365-2621.1987.tb14000.x.
B. H. Min, L. Erwin, and H. M. Jennings, “Rheological behaviour of fresh cement paste as measured by squeeze flow,” Journal of Materials Science, vol. 29, no. 5, pp. 1374–1381, Mar. 1994, doi: 10.1007/BF00975091.
J. D. Sherwood and D. Durban, “Squeeze-flow of a Herschel–Bulkley fluid,” Journal of Non-Newtonian Fluid Mechanics, vol. 77, no. 1, pp. 115–121, May 1998, doi: 10.1016/S0377-0257(97)00099-2.
D. N. Smyrnaios and J. A. Tsamopoulos, “Squeeze flow of Bingham plastics,” Journal of Non-Newtonian Fluid Mechanics, vol. 100, no. 1, pp. 165–189, Sep. 2001, doi: 10.1016/S0377-0257(01)00141-0.
F. A. Cardoso, A. K. Agopyan, C. Carbone, R. G. Pileggi, and V. M. John, “Squeeze flow as a tool for developing optimized gypsum plasters,” Construction and Building Materials, vol. 23, no. 3, pp. 1349–1353, Mar. 2009, doi: 10.1016/j.conbuildmat.2008.07.017.
N. Delhaye, A. Poitou, and M. Chaouche, “Squeeze flow of highly concentrated suspensions of spheres,” Journal of Non-Newtonian Fluid Mechanics, vol. 94, no. 1, pp. 67–74, Nov. 2000, doi: 10.1016/S0377-0257(00)00130-0.
MetricsAbstract Views: 74
PDF Downloads: 56
Copyright (c) 2020 Authors
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors who publish with this journal agree to the following terms:
- Authors retain the copyright and grant the journal the right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) after its publication in ETASR with an acknowledgement of its initial publication in this journal.