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Rheology of cement paste under high pressure

Jae Hong Kim; Seung Hee Kwon; Shiho Kawashima; Hong Jae Yim

Title:
Rheology of cement paste under high pressure
Author(s):
Kim, Jae Hong
Kwon, Seung Hee
Kawashima, Shiho
Yim, Hong Jae
Date:
Type:
Articles
Department(s):
Civil Engineering and Engineering Mechanics
Volume:
77
Persistent URL:
Book/Journal Title:
Cement and Concrete Composites
Publisher:
Elsevier
Abstract:
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.
Subject(s):
Pressure
Rheology
Viscosity
Cement
Civil engineering
Publisher DOI:
https://doi.org/10.1016/j.cemconcomp.2016.11.007
Item views
164
Metadata:
text | xml
Suggested Citation:
Jae Hong Kim, Seung Hee Kwon, Shiho Kawashima, Hong Jae Yim, , Rheology of cement paste under high pressure, Columbia University Academic Commons, .

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