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Journal of Materials Science

, Volume 29, Issue 5, pp 1374–1381 | Cite as

Rheological behaviour of fresh cement paste as measured by squeeze flow

  • B. H. Min
  • L. Erwin
  • H. M. Jennings
Papers

Abstract

A method is proposed for measuring the rheology of cement paste under conditions that suppress shear flow, i.e. squeezing. This method is based on squeezing samples in a servohydraulic compression-tension testing machine, and is different from the commonly used shear flow experiments. Possible artefacts such as the buoyancy of the piston that penetrates the paste, sedimentation of cement paste, geometry of the container, and friction at the interface between the top plate (or piston) and sample are investigated. Plots of stress versus apparent strain were obtained and compared with results from standard shear flow experiments. Because cement paste has both viscoelastic and viscoplastic characteristics, results are analysed in terms of both solid-like deformation and liquid-like flow behaviour. A first-approximation theoretical analysis is developed, based on the assumption that cement paste behaves as a non-Newtonian liquid, and results are compared with the experimental results.

Keywords

Polymer Sedimentation Theoretical Analysis Testing Machine Shear Flow 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Nomenclature

\(\dot \gamma\)

Shear strain rate in power law fluid model

γzr

Shear strain converted from ε zr

\(\dot \gamma _{zr}\)

Shear strain rate

έ

Normal strain rate

εzr

Component of shear strain

έzr

Component of shear strain rate

εzz

Component of normal strain

η

Viscosity

ϱ

Density of cement paste (3.2 g cm−3)

σCav

Calculated average normal stress of cement paste

σNav

Calculated average normal stress of power law fluid

σm

Measured normal stress of cement paste

σzz

Normal stress in z direction

Τeq

Equivalent shear stress converted from normal stress

Τrz

Shear stress in momentum equation

ai

Coefficients in polynomial function of geometric factor for cement paste

B

Buoyancy force

CGF

Geometric factor for cement paste

do

Amplitude of squeeze motion

FN

Load in normal direction

g

Gravitational constant

h

Sample height

ho

Initial sample height

\(\dot h\)

Velocity of platen

k

Order of polynomial function of geometric factor for cement paste

m

Consistency in power-law fluid model

n

Power index in power-law fluid model

P

Pressure

Pa

Atmospheric pressure

PGF

Geometric factor for power-law fluid model

r

Radial direction in cylindrical coordinates

R

Radius of sample

s

1/n

V

Volume of the top platen submerged into cement paste

vr

Velocity inr direction

vz

Velocity in z direction

z

Vertical direction in cylindrical coordinates

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • B. H. Min
    • 1
  • L. Erwin
    • 2
  • H. M. Jennings
    • 3
  1. 1.Departments of Mechanical EngineeringRobert R. McCormick School of Engineering and Applied Science, Northwestern UniversityEvanstonUSA
  2. 2.Departments of Material Science and EngineeringRobert R. McCormick School of Engineering and Applied Science, Northwestern UniversityEvanstonUSA
  3. 3.Civil EngineeringRobert R. McCormick School of Engineering and Applied Science, Northwestern UniversityEvanstonUSA

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