ASTM C191-07
(Test Method)Standard Test Methods for Time of Setting of Hydraulic Cement by Vicat Needle
Standard Test Methods for Time of Setting of Hydraulic Cement by Vicat Needle
SIGNIFICANCE AND USE
This test method provides a means of determining compliance with a specification limit for Vicat time of setting. Refer to the appropriate specification for the cement to determine if this test method is used for specification compliance.
Time of setting measured by this method will not necessarily provide the same results as the time of setting of hydraulic cement paste measured by other methods, or the time of setting of mortar or concrete.
SCOPE
1.1 These test methods determine the time of setting of hydraulic cement by means of the Vicat needle. Two test methods are given; Method A is the Reference Test Method using the manually operated standard Vicat apparatus, while Method B permits the use of an automatic Vicat machine that has, in accordance with the qualification requirements of this method, demonstrated acceptable performance.
1.2 The values stated in SI units are to be regarded as the standard. Values in parentheses are for information only.
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. See for a specific warning statement.
1.3 Warning-Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. The use of gloves, protective clothing, and eye protection is recommended. Wash contact area with copious amounts of water after contact. Wash eyes for a minimum of 15 min. Avoid exposure of the body to clothing saturated with the liquid phase of the unhardened material. Remove contaminated clothing immediately after exposure.
1.4 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.Note 1
For the method for determining the time of setting by Gillmore needles, see Test Method C 266.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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American Association State
Designation:C191–07 Highway and Transportation Officials Standard
AASHTO No.: T131
Standard Test Methods for
1
Time of Setting of Hydraulic Cement by Vicat Needle
This standard is issued under the fixed designation C 191; 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* C 151 Test Method for Autoclave Expansion of Hydraulic
Cement
1.1 These test methods determine the time of setting of
C 183 Practice for Sampling and the Amount of Testing of
hydraulic cement by means of the Vicat needle. Two test
Hydraulic Cement
methods are given; Method A is the Reference Test Method
C 187 Test Method for Normal Consistency of Hydraulic
using the manually operated standard Vicat apparatus, while
Cement
Method B permits the use of an automatic Vicat machine that
C 219 Terminology Relating to Hydraulic Cement
has, in accordance with the qualification requirements of this
C 266 Test Method for Time of Setting of Hydraulic-
method, demonstrated acceptable performance.
Cement Paste by Gillmore Needles
1.2 The values stated in SI units are to be regarded as the
C 305 PracticeforMechanicalMixingofHydraulicCement
standard. Values in parentheses are for information only.
Pastes and Mortars of Plastic Consistency
1.3 This standard does not purport to address all of the
C511 Specification for Mixing Rooms, Moist Cabinets,
safety concerns, if any, associated with its use. It is the
Moist Rooms, and Water Storage Tanks Used in the
responsibility of the user of this standard to establish appro-
Testing of Hydraulic Cements and Concretes
priate safety and health practices and determine the applica-
C 595 Specification for Blended Hydraulic Cements
bility of regulatory limitations prior to use. See 1.4 for a
C 1005 Specification for Reference Masses and Devices for
specific warning statement.
Determining Mass and Volume for Use in the Physical
1.4 Warning—Fresh hydraulic cementitious mixtures are
Testing of Hydraulic Cements
caustic and may cause chemical burns to skin and tissue upon
C 1157 Performance Specification for Hydraulic Cement
prolonged exposure. The use of gloves, protective clothing,
D 1193 Specification for Reagent Water
and eye protection is recommended. Wash contact area with
copious amounts of water after contact. Wash eyes for a
3. Terminology
minimum of 15 min. Avoid exposure of the body to clothing
3.1 Definitions—The terms used in this test method are
saturated with the liquid phase of the unhardened material.
2 defined in accordance with Terminology C 219.
Remove contaminated clothing immediately after exposure.
1.5 The text of this standard references notes and footnotes
4. Summary of Test Method
which provide explanatory material.These notes and footnotes
4.1 A paste that is proportioned and mixed to normal
(excluding those in tables and figures) shall not be considered
consistency, as described in the Test Method C 187, is molded
as requirements of the standard.
and placed in a moist cabinet and allowed to start setting.
NOTE 1—For the method for determining the time of setting by
Periodic penetration tests are performed on this paste by
Gillmore needles, see Test Method C 266.
allowing a 1-mm Vicat needle to settle into this paste. The
Vicat initial time of setting is the time elapsed between the
2. Referenced Documents
initial contact of cement and water and the time when the
3
2.1 ASTM Standards:
penetration is measured or calculated to be 25 mm. The Vicat
C 150 Specification for Portland Cement
final time of setting is the time elapsed between initial contact
of cement and water and the time when the needle does not
1
These test methods are under the jurisdiction of ASTM Committee C01 on leave a complete circular impression in the paste surface.
Cement and is the direct responsibility of Subcommittee C01.30 on Time of Set.
Current edition approved July 15, 2007. Published August 2007. Originally
5. Significance and Use
approved in 1944. Last previous edition approved in 2004 as C 191 – 04b.
2
5.1 This test method provides a means of determining
Section on Safety, Manual of Cement Testing, Annual Book of ASTM
Standards, Vol 04.01.
compliance with a specification limit for Vicat time of setting.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Refer to the appropriate specification for the cement to
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
determine if this test method is used for specification compli-
Standards volume information, refer to the standard’s Document Summary page on
ance.
the ASTM website.
*A Summary of Changes
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