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Title: | Investigation of dilatancy mechanism of Portland cement paste |
Authors: | Daukšys, Mindaugas Skripkiūnas, Gintautas |
Keywords: | Portland cement Finely ground quartz sand Microsilica suspension Elastic deformation Change in volume Dilatancy |
Issue Date: | 2018 |
Publisher: | Elsevier |
Citation: | Daukšys, M., Skripkiūnas, G., 2018. Investigation of dilatancy mechanism of Portland cement paste. Construction and Building Materials. 83, 53-61. https://doi.org/10.1016/j.conbuildmat.2015.02.070 |
Series/Report no.: | 83; |
Abstract: | The increase in cement paste volume during the flowing has been determined by specially developed
equipment and the investigation methodology was proposed. Pressure (kPa), under which the cement
paste starts flowing, the average cement paste flow rate (cm/s), elastic deformation (%) and the increase
in cement paste volume due to redistribution of solid phase particles (%) were established in experimental tests of Portland cement pastes with different W/C ratio, Portland cement pastes with SiO2 microparticle suspension and quartz sand additive. With the increase of W/C ratio or liquid phase in cement pastes
the elastic deformation drops from 0.83% to 0.27%, while the volume of dispersion when the paste starts
flowing increases from 0.63% to 1.31% due to cement particle redistribution under shear stress. When
elastic rebound occurs, the volume of pastes with SiO2 microparticle suspension does not increase when
solid phase particles redistribute during the flow; dilatancy is not observed in the pastes with this
additive either or it is insignificant. When quartz sand particles of irregular size and large than cement
particles redistribute during the flow, the volume of the paste increases more (1.24–1.64%) and dilatancy
is observed in pastes with this additive. The test results confirm the earlier statements of researchers
stating that disperse systems are subject to dilatancy because of the increase of the system’s volume
under shear stress (during the flow), i.e. because of redistribution of the solid phase in the system
subjected to shear stress. |
URI: | http://dspace.vgtu.lt/handle/1/4207 |
ISSN: | 0950-0618 |
Appears in Collections: | Moksliniai straipsniai / Research articles
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