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ASTM C807-99

(Test Method)

Standard Test Method for Time of Setting of Hydraulic Cement Mortar by Modified Vicat Needle

Standard Test Method for Time of Setting of Hydraulic Cement Mortar by Modified Vicat Needle

SCOPE
1.1 This test method covers the determination of the time of setting of hydraulic cement mortar by means of the modified Vicat needle.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
1.3 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 Note 1 for a specific warning statement.
Note 1--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.

General Information

Status
Historical
Publication Date
09-Jan-1999
ICS
91.100.10 - Cement. Gypsum. Lime. Mortar
Technical Committee
C01 - Cement
Drafting Committee
C01.30 - Time of Set
Current Stage
Ref Project

Relations

Replaced By
ASTM C807-03 - Standard Test Method for Time of Setting of Hydraulic Cement Mortar by Modified Vicat Needle
Effective Date
10-Jul-2003
Referred By
ASTM C845/C845M-18 - Standard Specification for Expansive Hydraulic Cement
Effective Date
10-Jan-1999
Referred By
ASTM C827/C827M-23 - Standard Test Method for Change in Height at Early Ages of Cylindrical Specimens of Cementitious Mixtures
Effective Date
10-Jan-1999
Referred By
ASTM C183/C183M-23 - Standard Practice for Sampling and the Amount of Testing of Hydraulic Cement
Effective Date
10-Jan-1999

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ASTM C807-99 - Standard Test Method for Time of Setting of Hydraulic Cement Mortar by Modified Vicat NeedleASTM C807-99 - Standard Test Method for Time of Setting of Hydraulic Cement Mortar by Modified Vicat Needle
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ASTM C807-99 - Standard Test Method for Time of Setting of Hydraulic Cement Mortar by Modified Vicat Needle
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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: C 807 – 99
Standard Test Method for
Time of Setting of Hydraulic Cement Mortar by Modified
Vicat Needle
This standard is issued under the fixed designation C 807; 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 Water Storage Tanks Used in the Testing of Hydraulic
Cements and Concretes
1.1 This test method covers the determination of the time of
C 670 Practice for Preparing Precision and Bias Statements
setting of hydraulic cement mortar by means of the modified
for Test Methods for Construction Materials
Vicat needle.
C 778 Specification for Standard Sand
1.2 The values stated in SI units are to be regarded as
C 845 Specification for Expansive Hydraulic Cement
standard. The values given in parentheses are for information
C 1005 Specification for Reference Masses and Devices for
only.
Determining Mass for Use in the Physical Testing of
1.3 This standard does not purport to address all of the
Hydraulic Cements
safety concerns, if any, associated with its use. It is the
D 1193 Specification for Reagent Water
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
3. Terminology
bility of regulatory limitations prior to use. See Note 1 for a
3.1 Terms used in this standard are defined in Terminology
specific warning statement.
C 219.
NOTE 1—Warning: Fresh hydraulic cementitious mixtures are caustic
and may cause chemical burns to skin and tissue upon prolonged
4. Summary of Test Method
exposure. The use of gloves, protective clothing, and eye protection is
4.1 Amortar is prepared with the cement to be tested, using
recommended. Wash contact area with copious amounts of water after
stipulated quantities of cement and water, and sufficient stan-
contact. Wash eyes for a minimum of 15 min.Avoid exposure of the body
dard sand to produce a required consistency as determined by
to clothing saturated with the liquid phase of the unhardened material.
Remove contaminated clothing immediately after exposure. a stipulated penetration using the plunger of the modifiedVicat
apparatus. Mortar of the proper consistency is then tested for
2. Referenced Documents
time of setting, using the needle of the modified Vicat
2.1 ASTM Standards:
apparatus for the determination of a stipulated penetration.The
C 109/C 109M Test Method for Compressive Strength of
time required to obtain the stipulated penetration of the
Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube
modified Vicat needle is the time of setting.
Specimens)
5. Significance and Use
C 183 Practice for Sampling and the Amount of Testing of
Hydraulic Cement 5.1 The purpose of this test method is to establish whether
C 187 Test Method for Normal Consistency of Hydraulic
or not a cement complies with a specification limit on time of
Cement setting. It has been found to be particularly applicable for the
C 219 Terminology Relating to Hydraulic Cement
determination of the setting time of expansive cements (see
C 305 PracticeforMechanicalMixingofHydraulicCement Specification C 845).
Pastes and Mortars of Plastic Consistency
6. Apparatus
C 490 Practice for Use of Apparatus for the Determination
of Length Change of Hardened Cement Paste, Mortar, and 6.1 Tamper and Trowel, conforming to the requirements of
Concrete Test Method C 109.
C 511 Specification for Moist Cabinets, Moist Rooms, and 6.2 VicatApparatus, conforming to the requirements ofTest
Method C 187, with the following modifications:
6.2.1 For consistency determination, the plunger end of the
movable rod shall be 17.5 6 0.5 mm in diameter instead of 10
This test method is under the jurisdiction ofASTM Committee C-1 on Cement
and is the direct responsibility of Subcommittee C01.30 on Time of Set.
Current edition approved Jan. 10, 1999. Published May 1999. Originally
e1 3
published as C 807 – 75. Last previous edition C 807 – 89(1995) . Annual Book of ASTM Standards, Vol 04.02.
2 4
Annual Book of ASTM Standards, Vol 04.01. Annual Book of ASTM Standards, Vol 11.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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.
C 807
mm, and the total mass of the movable rod (including the of the mold, 10 mm above the mold, and finish the stroke by
17.5-mm plunger) shall be 400 6 0.5 g. cutting the mortar off the top of the mold at the opposite side.
6.2.2 For time of setting determination, a 2 6 0.05-mm Second, starting from the opposite direction, cut the mortar
stainless steel needle shall be substituted for the 1-mm needle. flush with the top of the mold by drawing the straight edge of
The total mass of the movable rod with the 2-mm needle shall
the trowel (held nearly perpendicular to the mold) with a
be 300 6 0.5 g. sawing motion across the top of the mold.
6.3 Mold for Consistency and Setting Time—A smooth
10.2 Test for Consistency—Center the mortar confined in
cylindrical brass ring 76 6 0.5 mm inside diameter (3-in. brass
the mold under the movable rod of the modified Vicat
tubing) by 40 6 1 mm deep, cemented to a plane, non-
apparatus described above. Bring the plunger in contact with
absorptive plate, or smooth cylindrical brass cups having the
the surface of the mortar and tighten the setscrew. Then set the
above dimensions.
movable indicator to the upper zero mark on the scale, or take
6.4 Mixer, Bowl, Paddle, and Scraper, conforming to the
an initial reading, and release the rod 35 to 50 s after starting
requirements of Practice C 305.
to fill the mold.
...

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This test method covers the standard procedure for determination of length changes of expansive cement mortar, while under restraint, due to the development of internal forces resulting from hydration of the cement. The test apparatus is comprised of the following: molds for casting test specimens; restraining cage which consists of a threaded steel rod with steel end plates held in place by cap nuts for corrosion prevention; length comparator; tamper which shall be made of nonabsorptive, nonabrasive material such as medium-hard rubber or seasoned oak wood; device for demolding specimens; weights and weighing devices; glass graduates to measure the mixing water in a single operation; an electrically driven mechanical mixer equipped with paddle and mixing bowl; and trowel which shall have a steel blade with straight edges. The sand to be used shall comply with the graded sand requirement and shall be handled in such a manner as to prevent segregation. Details on preparation and assembly of specimen molds and restraining cage, proportioning and mixing of mortars, molding, and curing of specimens are discussed. The expansion and shrinkage of the test specimens at any age shall be calculated and the length-change data, expressed as linear expansion or contraction based on the length of the specimen at any time of molding, shall be reported. Bias and precision in the batch, single, and multi-laboratory operation shall also be identified.
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4.1 Numerous properties of cementitious materials are controlled by their initial hydration rate. Examples include early-age strength development, heat release, and crack resistance. One direct and convenient measure of this initial hydration rate is provided by the measurement of the chemical shrinkage of the cement paste during its hydration. As cement hydrates, the hydration products occupy less volume than the initial reacting materials (cement and water). Due to this volume change, a hydrating cement paste will sorb water from its immediate surroundings, when available. At early times, this sorption is in direct proportion to the amount of hydration that has occurred.5 This method is based on the one developed by Geiker.6 The results are relevant to understanding the hydration behavior of cements. This method does not measure the bulk volume changes (autogenous shrinkage) associated with chemical shrinkage nor the cracking potential of concretes produced with the evaluated cement.
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.  
1.3 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, health, and environmental 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.2)  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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5.1 This method is intended to help manufacturers determine the relative pack-set tendency of their cement(s). The test establishes a pack-set index which, when properly correlated with field performance, is useful in predicting or preventing field unloading difficulties.  
5.2 The test is an aid to routine control during cement production and is not suitable for specification purposes.  
5.3 In general, field performance of cement flowability is satisfactory when the pack-set index as determined on freshly ground cement averages 0 to 15 and is unsatisfactory when the index exceeds 25. Any prediction of field performance of cement flowability measuring 16 to 25 is tenable. These are general ranges and the field performance of individual cements may not necessarily fall within these ranges. Additional conditions, after the cement has left the control of the manufacturing facility, can affect the apparent pack set index as well.  
5.4 Any attempt to apply the critical range of pack-set index numbers based on freshly ground cement to job cement without special treatment of the sample would be problematic. The test is a “GO-NO-GO” type of test and should not be used for specification purposes.  
5.5 The pack-set index of field cement can be evaluated in terms of the pack-set index ranges of that cement as determined when freshly-ground. This comparison can aid the manufacturer in producing cement that offers the best field performance for pack-set properties.  
5.6 Silo storage of cement may result in a greater amount of consolidation than this method is designed to induce, and the resulting forces required to overcome that consolidation are not measured by this test method.  
5.7 Pack set is not to be confused with “warehouse set” which results from surface hydration of the cement from adsorbed moisture.
SCOPE
1.1 This test method covers the determination of the pack-set index, which provides an indication of the mechanical force needed to overcome the consolidation of portland and blended hydraulic cements.  
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1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. Values stated in SI units shall be obtained by measurement in SI units or by appropriate conversion, using the rules of Conversion and rounding given in Standard IEEE/ASTM SI 10, of measurements made in other units.  
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1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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