ASTM C807-21

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C807 − 20 C807 − 21
Standard Test Method for
Time of Setting of Hydraulic Cement Mortar by Modified
Vicat Needle
This standard is issued under the fixed designation C807; 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*
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. No other units of measurement are included in this 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. )(Warning—Fresh hydraulic cementitious mixtures are caustic and may cause
chemical burns to skin and tissue upon prolonged 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.
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.
2. Referenced Documents
2.1 ASTM Standards:
C109/C109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50 mm] Cube Specimens)
C183/C183M Practice for Sampling and the Amount of Testing of Hydraulic Cement
C187 Test Method for Amount of Water Required for Normal Consistency of Hydraulic Cement Paste
C219 Terminology Relating to Hydraulic and Other Inorganic Cements
C305 Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency
C511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of Hydraulic
Cements and Concretes
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
C778 Specification for Standard Sand
C845/C845M Specification for Expansive Hydraulic Cement
This test method is under the jurisdiction of ASTM Committee C01 on Cement and is the direct responsibility of Subcommittee C01.30 on Time of Set.
Current edition approved Oct. 1, 2020Oct. 1, 2021. Published October 2020November 2021. Originally approved in 1975. Last previous edition approved in 20182020
as C807 – 18.C807 – 20. DOI: 10.1520/C0807-20.10.1520/C0807-21.
See the section on Safety, Manual of Cement Testing, Annual Book of ASTM Standards, Vol 04.01.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
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C807 − 21
C1005 Specification for Reference Masses and Devices for Determining Mass and Volume for Use in Physical Testing of
Hydraulic Cements
D1193 Specification for Reagent Water
3. Terminology
3.1 Definitions:
3.1.1 Terms For definitions of terms used in this standard are defined intest method, refer to Terminology C219.
4. Summary of Test Method
4.1 A mortar is prepared with the cement to be tested, using stipulated quantities of cement and water, and sufficient standard sand
to produce a required consistency as determined by a stipulated penetration using the plunger of the modified Vicat apparatus.
Mortar of the proper consistency is then tested for time of setting, using the needle of the modified Vicat apparatus for the
determination of a stipulated penetration. The time required to obtain the stipulated penetration of the modified Vicat needle is the
time of setting.
5. Significance and Use
5.1 The purpose of this test method is to establish whether or not a cement complies with a specification limit on time of setting.
It has been found to be particularly applicable for the determination of the setting time of expansive cements (see Specification
C845/C845M).
6. Apparatus
6.1 Tamper and Trowel, conforming to the requirements of Test Method C109/C109M. In addition, the edges of the trowel when
placed on a plane surface shall not depart from straightness by more than 1 mm.
6.2 Vicat Apparatus, conforming to the requirements of Test Method C187, 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 mm,
and the total mass of the movable rod (including the 17.5 mm plunger) shall be 400 6 0.5 g.
6.2.2 For time of setting determination, a 2 6 0.05 mm stainless steel needle shall be substituted for the 1 mm needle. The total
mass of the movable rod with the 2 mm needle shall be 300 6 0.5 g.
6.3 Mold for Consistency and Setting Time—A smooth cylindrical brass ring 76 6 0.5 mm inside diameter (3-in. brass tubing) by
40 6 1 mm deep, cemented to a plane, non-absorptive plate, or smooth cylindrical brass cups having the above dimensions.
6.4 Mixer, Bowl, Paddle, and Scraper, conforming to the requirements of Practice C305.
6.5 Glass Graduates, conforming to the requirements of Specification C1005.
6.6 Masses and Mass Determining Devices, conforming to the requirements of Specification C1005. The devices for determining
mass shall be evaluated for continuing precise performance utilizing the procedure in Specification C1005, Appendix X1, using
a verification check mass of approximately 1000 g.
7. Reagents and Materials
7.1 Graded Standard Sand, conforming to the requirements of Specification C778.
7.2 Mixing Water—Potable water is satisfactory for routine tests. For Use reagent water for all referee and cooperative tests,
reagent water conforming to the requirements of Specification tests. D1193 for Type III or Type IV grade of reagent water shall
be used.
C807 − 21
8. Sampling
8.1 When the test is part of acceptance testing, sample the cement in accordance with Practice C183/C183M.
9. Conditioning
9.1 Maintain the temperature and humidity of the mixing room and the
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