Rheology of cement paste under high pressure

The objective of this study was to investigate whether cementitious materials undergo changes during pumping processes due to pressure variation. The influence of pressure on the rheological properties of cement pastes, which assumably represented the lubricating layer that forms along the profile o...

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Bibliographic Details
Published inCement & concrete composites Vol. 77; pp. 60 - 67
Main Authors Kim, Jae Hong, Kwon, Seung Hee, Kawashima, Shiho, Yim, Hong Jae
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.03.2017
Subjects
Cement paste
Characterization
Pressure
Pumping
Rheology
Viscosity
Characterization
Viscosity
Pumping
Rheology
Pressure
Cement paste
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Summary:The objective of this study was to investigate whether cementitious materials undergo changes during pumping processes due to pressure variation. The influence of pressure on the rheological properties of cement pastes, which assumably represented the lubricating layer that forms along the profile of concrete during pumping, was evaluated using a rotational rheometer with a high-pressure cell. Cement pastes with water-to-cement ratios ranging from 0.35 to 0.6 were tested according to a protocol designed to simulate the conditions of an actual pumping process based on field tests. The shear rates, shearing durations, and pressure levels from 0 to 30 MPa were experimentally simulated. The test results indicated that below a certain water-to-cement ratio (0.40) elevated pressures lead to changes in the rheological properties, while changes were negligible when the ratio was above this threshold. Further, at low water-to-cement ratios the thixotropy of the cement paste can reverse into rheopexy after pressurization.
ISSN:0958-9465
1873-393X
DOI:10.1016/j.cemconcomp.2016.11.007