ASTM C1749-12

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Designation: C1749 − 12
Standard Guide for
Measurement of the Rheological Properties of Hydraulic
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Cementious Paste Using a Rotational Rheometer
This standard is issued under the fixed designation C1749; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Moist Rooms, and Water Storage Tanks Used in the
Testing of Hydraulic Cements and Concretes
1.1 This guide covers description of several methods to
C1005 Specification for Reference Masses and Devices for
measure the rheological properties of fresh hydraulic cement
Determining Mass and Volume for Use in the Physical
paste. All methods are designed to determine the yield stress
Testing of Hydraulic Cements
and plastic viscosity of the material using commercially
C1738 Practice for High-Shear Mixing of Hydraulic Cement
available instruments and the Bingham model. Knowledge of
Pastes
these properties gives useful information on performance of
cement pastes in concrete.
2.2 Other Standards:
API Recommended Practice 10B Testing Well Cements,
1.2 The values stated in SI units are to be regarded as
American Petroleum Institute, Washington, DC (1997)
standard. No other units of measurement are included in this
ISO10426-2(2003) PetroleumandNaturalGasIndustries—
standard.
Cements and Materials for Well Cementing—Part 2:
1.3 This guide offers an organized collection of information
Testing of Well Cements—Section 5.2
or a series of options and does not recommend a specific
course of action. This document cannot replace education or
3. Terminology
experience and should be used in conjunction with professional
judgment. Not all aspects of this guide may be applicable in all 3.1 Definitions—For definitions of terms used in this test
method, refer to Terminology C125 and C219.
circumstances. This ASTM standard is not intended to repre-
sent or replace the standard of care by which the adequacy of 3,4
3.2 Definitions of Terms Specific to This Standard:
a given professional service must be judged, nor should this
3.2.1 apparent viscosity, n—the shear stress divided by rate
document be applied without consideration of a project’s many
of shear, in units of Pa.s.
unique aspects. The word “Standard” in the title of this
3.2.2 plastic viscosity, n—in the plastic (Bingham) model,
document means only that the document has been approved
through the ASTM consensus process. the slope of the shear stress – shear rate curve, in units of Pa.s.
1.4 This standard does not purport to address all of the
3.2.3 thixotropy, n—a decrease of the apparent viscosity
safety concerns, if any, associated with its use. It is the
under constant shear stress or shear rate followed by a gradual
responsibility of the user of this standard to establish appro-
recovery when the stress or shear rate is removed.
priate safety and health practices and determine the applica-
3.2.4 yield stress, n—the stress corresponding to the transi-
bility of regulatory limitations prior to use.
tion from elastic to plastic deformation, in units of Pa; it is also
referred to as the stress needed to initiate flow. It would be
2. Referenced Documents
calculated using the Bingham model in this guide.
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2.1 ASTM Standards:
3.2.5 Bingham model, n—a rheological model for materials
C305 Practice for Mechanical Mixing of Hydraulic Cement
Pastes and Mortars of Plastic Consistency with non-zero yield stress and a linear relationship between
shear rate and shear stress, following the equation: τ = τ +
C511 Specification for Mixing Rooms, Moist Cabinets,
B
γ˙η ; where τ Yield stress in Pa, γ˙ Shear rate in 1/s, τ Shear
pl B
stress in Pa, and η Plastic viscosity in Pa.s.
pl
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This guide is under the jurisdiction of ASTM Committee C01 on Cement and
is the direct responsibility of Subcommittee C01.22 on Workability.
Current edition approved Feb. 1, 2012. Published March 2012.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or H.A. Barnes, J.F. Hutton and K.Walters,An Introduction to Rheology, Elsevier
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM (1989).
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Standards volume information, refer to the standard’s Document Summary page on Hackley V.A., Ferraris C.F., “The Use of Nomenclature in Dispersion Science
the ASTM website. and Technology” NIST Recommended Practice Guide, SP 960-3, 2001.
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C1749 − 12
4. Significance and Use 7.1.2 The rheometer geometry shall provide a simple shear-
ing flow (laminar, without
...