ASTM C61/C61M-00(2011)

Standard Specification for Gypsum Keene's Cement

ABSTRACT
This specification covers various grades of anhydrous calcined gypsum known as gypsum Keene's cement, designed for use in the base and finish coats of gypsum plaster. The cement shall show a combined water content not more than the specified value when tested in accordance with the referenced test method. The cement shall conform to the required physical properties and shall undergo tests on setting time, compressive strength, and fineness.
SCOPE
1.1 This specification covers various grades of anhydrous calcined gypsum known as gypsum Keene's cement, designed for use in the base and finish coats of gypsum plaster.
Note 1—The setting time is accelerated by the addition of other materials.
Note 2—Keene's cements are generally available as quick-setting and standard-setting types. However, various grades of gypsum Keene's cement of different fineness and setting time are available. Grades intended for use in scagliola castings and other special purposes should conform to the requirements of this specification in all respects except fineness and setting time.  
1.2 The values stated in either inch-pound or SI (metric) units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system shall be used independently of the other. Values from the two systems shall not be combined.
1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes shall not be considered as requirements of the standard.
1.4  The following safety hazards caveat pertains only to the test method in the appendix of this specification: 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.

General Information

• Status: Historical
• Publication Date: 30-Apr-2011
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C11 - Gypsum and Related Building Materials and Systems
• Drafting Committee: C11.01 - Specifications and Test Methods for Gypsum Products

Relations

• Replaces: ASTM C61/C61M-00(2006) - Standard Specification for Gypsum Keene's Cement
• Effective Date: 01-May-2011
• Replaced By: ASTM C61/C61M-00(2015) - Standard Specification for Gypsum Keene's Cement
• Effective Date: 01-Oct-2015
• Referred By: ASTM C11-23 - Standard Terminology Relating to Gypsum and Related Building Materials and Systems
• Effective Date: 01-May-2011
• Referred By: ASTM C1713-23 - Standard Specification for Mortars for the Repair of Historic Masonry
• Effective Date: 01-May-2011
• Referred By: ASTM C842-05(2021) - Standard Specification for Application of Interior Gypsum Plaster
• Effective Date: 01-May-2011

Standards Content (Sample)

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: C61/C61M −00(Reapproved 2011)
Standard Specification for
Gypsum Keene’s Cement
This standard is issued under the fixed designation C61/C61M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope C471M Test Methods for ChemicalAnalysis of Gypsum and
Gypsum Products (Metric)
1.1 This specification covers various grades of anhydrous
C472 Test Methods for Physical Testing of Gypsum, Gyp-
calcined gypsum known as gypsum Keene’s cement, designed
sum Plasters and Gypsum Concrete
for use in the base and finish coats of gypsum plaster.
E11 Specification for Woven Wire Test Sieve Cloth and Test
NOTE 1—The setting time is accelerated by the addition of other
Sieves
materials.
NOTE 2—Keene’s cements are generally available as quick-setting and
3. Terminology
standard-setting types. However, various grades of gypsum Keene’s
cement of different fineness and setting time are available. Grades
3.1 Definitions—Definitions of terms used in this specifica-
intended for use in scagliola castings and other special purposes should
tion shall be as defined in Terminology C11.
conform to the requirements of this specification in all respects except
3.2 Definitions of Terms Specific to This Standard:
fineness and setting time.
3.2.1 scagliola, n—an imitation marble used for ornamental
1.2 The values stated in either inch-pound or SI (metric)
interior work.
units are to be regarded separately as standard. Within the text,
the SI units are shown in brackets. The values stated in each
4. Chemical Composition
system shall be used independently of the other. Values from
4.1 Combined Water—The cement shall show a combined
the two systems shall not be combined.
water content not more than 2 % when tested in accordance
1.3 The text of this standard references notes and footnotes
with Test Methods C471M.
that provide explanatory material. These notes and footnotes
shall not be considered as requirements of the standard.
5. Physical Properties
1.4 The following safety hazards caveat pertains only to
5.1 Testing shall be in accordance with Test Methods C472,
the test method in the appendix of this specification: This
except that in the determination of the setting time and
standard does not purport to address all of the safety concerns,
compressive strength, the consistency used shall be such that a
if any, associated with its use. It is the responsibility of the user
35–g conical plunger, described in Test Methods C472, shall
of this standard to establish appropriate safety and health
give a penetration of 30 6 2 mm, 20 s after release, the
practices and determine the applicability of regulatory limita-
measurement being made 5 min after the addition of the
tions prior to use.
gypsum Keene’s cement to the gauging water.
5.1.1 Setting Time—The cement shall set in not less than 20
2. Referenced Documents
min and not more than 6 h when determined by the Vicat
2.1 ASTM Standards:
method.
C11 Terminology Relating to Gypsum and Related Building
5.1.2 Compressive Strength—GypsumKeene’scementshall
Materials and Systems
have a compressive strength of not less than 2500 psi [17
MPa]. Soak standard Keene’s cement in water for 20 min with
occasional stirring before filling the mold in the compressive
strength determination.
This specification is under the jurisdiction of ASTM Committee C11 on
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility
5.1.3 Fineness—The cement shall all pass a No. 14 [1.40
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
mm] sieve; not less than 98 % shall pass a No. 40 [425–µm]
Current edition approved May 1, 2011. Published May 2011. Originally
sieve, and not less than 80 % shall pass a No. 100 [150–µm]
approved in 1926. Last previous edition approved in 2006 as C61/C61M – 00
(2006). DOI: 10.1520/C0061_C0061M-00R11. sieve.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Detailed requirements for these sieves are given in ASTM Specification E11.
*A Summary of Changes section appears at the end of this standard
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