Standard Test Method for Chemical Shrinkage of Hydraulic Cement Paste

SCOPE
1.1 This test method measures the internal (absolute) volume change of hydraulic cement paste that results from the hydration of the cementitious materials. This volume change is known as chemical shrinkage.
1.1.1 Procedure A, volumetric method.
1.1.2 Procedure B, the density method.
1.2 The values stated in SI units are to be regarded as the standard.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. (Warning-Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.)

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31-Oct-2006
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ASTM C1608-06 - Standard Test Method for Chemical Shrinkage of Hydraulic Cement Paste
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
International (www.astm.org) for the latest information.
Designation:C1608–06
Standard Test Method for
1
Chemical Shrinkage of Hydraulic Cement Paste
This standard is issued under the fixed designation C 1608; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope* 3.1.1 chemical shrinkage, n—the absolute (internal) vol-
ume change accompanying the hydration of cement, due to the
1.1 This test method measures the internal (absolute) vol-
fact that the cement hydration products occupy less physical
ume change of hydraulic cement paste that results from the
volume than the reactants.
hydration of the cementitious materials.This volume change is
3.1.2 All other terms are as defined in Terminology C 219.
known as chemical shrinkage.
1.1.1 Procedure A, volumetric method.
4. Significance and Use
1.1.2 Procedure B, the density method.
Numerous properties of cementitious materials are con-
1.2 The values stated in SI units are to be regarded as the
trolled by their initial hydration rate. Examples include early-
standard.
age strength development, heat release, and crack resistance.
1.3 This standard does not purport to address all of the
One direct and convenient measure of this initial hydration rate
safety concerns, if any, associated with its use. It is the
is provided by the measurement of the chemical shrinkage of
responsibility of the user of this standard to establish appro-
the cement paste during its hydration.As cement hydrates, the
priate safety and health practices and determine the applica-
hydration products occupy less volume than the initial reacting
bility of regulatory limitations prior to use. (Warning—Fresh
materials (cement and water). Due to this volume change, a
hydraulic cementitious mixtures are caustic and may cause
2
hydrating cement paste will sorb water from its immediate
chemical burns to skin and tissue upon prolonged exposure. )
surroundings, when available.At early times, this sorption is in
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2. Referenced Documents directproportiontotheamountofhydrationthathasoccurred.
5
3
This method is based on the one developed by Geiker. The
2.1 ASTM Standards:
results are relevant to understanding the hydration behavior of
C 186 Test Method for Heat of Hydration of Hydraulic
cements. This method does not measure the bulk volume
Cement
changes (autogenous shrinkage) associated with chemical
C 188 Test Method for Density of Hydraulic Cement
shrinkage nor the cracking potential of concretes produced
C 219 Terminology Relating to Hydraulic Cement
with the evaluated cement.
C 305 PracticeforMechanicalMixingofHydraulicCement
Pastes and Mortars of Plastic Consistency
5. Apparatus
C511 Specification for Mixing Rooms, Moist Cabinets,
5.1 Devices for Determining Mass, conforming to the re-
Moist Rooms, and Water Storage Tanks Used in the
quirements of Specification C 1005 and evaluated for precision
Testing of Hydraulic Cements and Concretes
and accuracy at a total load of 100 g.
C 1005 Specification for Reference Masses and Devices for
5.2 Constant Temperature Water Bath—a water bath ca-
Determining Mass and Volume for Use in the Physical
pable of maintaining a temperature of 23.0 6 0.5 °C, with a
Testing of Hydraulic Cements
sufficient capacity to hold the specimens being evaluated. To
3. Terminology avoid evaporative cooling, the surface of the water in the bath
shall be covered with floating plastic balls or fitted with an
3.1 Definitions:
insulated lid.
5.3 Timing Device—Clock that can measure time to the
nearest minute.
1
This test method is under the jurisdiction of ASTM CommitteeC01 onCement
and is the direct responsibility of Subcommittee C01.31 on Volume Change.
Current edition approved Nov. 1, 2006. Published November 2006. Originally
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approved in 2005. Last previous edition approved in 2005 as C 1608 – 05. L.J. Parrott, M. Geiker, W.A. Gutteridge, and D. Killoh, “Monitoring Portland
2
See the section on Safety, Manual of Cement Testing, Annual Book of ASTM Cement Hydration: Comparison of Methods,” Cement and Concrete Research, Vol.
Standards, Vol. 04.01. 20, 919-926, 1990.
3 5
For referenced ASTM standards, visit the ASTM website, www.astm.org, or M.Geiker,“StudiesofPortlandCementHydration:MeasurementsofChemical
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Shrinkage and a Systematic Evaluation of Hydration Curves by Means of the
Standards volume information, refer to the standard’s Document Summary page on Dispersion Model,” Ph.D. Thesis, Technical University of Denmark, Copenhagen,
the ASTM website. Denmark, 1983.
*A Summary of Changes section appears at the end of this standard.
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