ASTM C28/C28M-10(2020)

Standard Specification for Gypsum Plasters

ABSTRACT
This specification covers four gypsum plasters; gypsum mill-mixed plaster, gypsum neat plaster, gypsum wood fibered plaster, and gypsum gauging plaster. The plasters shall contain a volume of aggregate not more than requirements prescribed. Compressive strength test and Vicat test shall be performed to meet the requirements.
SCOPE
1.1 This specification covers gypsum mill-mixed plaster, gypsum neat plaster, gypsum wood-fibered plaster, and gypsum gauging plaster.
Note 1: Specification C842 contains application procedures for interior gypsum plaster.  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. This units statement does not apply to the appendix.  
1.3 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.  
1.4 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.  
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.

General Information

• Status: Published
• Publication Date: 31-May-2020
• 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

• Refers: ASTM C472-20 - Standard Test Methods for Physical Testing of Gypsum, Gypsum Plasters, and Gypsum Concrete
• Effective Date: 01-Apr-2020
• Referred By: ASTM C11-23 - Standard Terminology Relating to Gypsum and Related Building Materials and Systems
• Effective Date: 01-Jun-2020
• Referred By: ASTM C631-09(2020) - Standard Specification for Bonding Compounds for Interior Gypsum Plastering
• Effective Date: 01-Jun-2020
• Referred By: ASTM C471M-20ae1 - Standard Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric)
• Effective Date: 01-Jun-2020
• Referred By: ASTM C110-20 - Standard Test Methods for Physical Testing of Quicklime, Hydrated Lime, and Limestone
• Effective Date: 01-Jun-2020
• Referred By: ASTM C842-05(2021) - Standard Specification for Application of Interior Gypsum Plaster
• Effective Date: 01-Jun-2020

Standards Content (Sample)

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.
Designation:C28/C28M −10 (Reapproved 2020)
Standard Specification for
1
Gypsum Plasters
This standard is issued under the fixed designation C28/C28M; 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 C11 Terminology Relating to Gypsum and Related Building
Materials and Systems
1.1 This specification covers gypsum mill-mixed plaster,
C22/C22M Specification for Gypsum
gypsum neat plaster, gypsum wood-fibered plaster, and gyp-
C35 Specification for Inorganic Aggregates for Use in Gyp-
sum gauging plaster.
sum Plaster
NOTE 1—Specification C842 contains application procedures for inte-
C471M Test Methods for ChemicalAnalysis of Gypsum and
rior gypsum plaster.
Gypsum Products (Metric)
1.2 The values stated in either SI units or inch-pound units
C472 Test Methods for Physical Testing of Gypsum, Gyp-
are to be regarded separately as standard. Within the text, the
sum Plasters, and Gypsum Concrete
SI units are shown in brackets. The values stated in each
C778 Specification for Standard Sand
system may not be exact equivalents; therefore, each system
C842 Specification forApplication of Interior Gypsum Plas-
shall be used independently of the other. Combining values
ter
from the two systems may result in non-conformance with the
E11 Specification for Woven Wire Test Sieve Cloth and Test
standard. This units statement does not apply to the appendix.
Sieves
1.3 The text of this standard references notes and footnotes
3. Terminology
which provide explanatory material. These notes and footnotes
3.1 Definitions:
(excluding those in tables and figures) shall not be considered
3.1.1 Definitions shall be in accordance with Terminology
as requirements of the standard.
C11.
1.4 This standard does not purport to address all of the
3.2 Definitions of Terms Specific to This Standard:
safety concerns, if any, associated with its use. It is the
3.2.1 gypsum gauging plaster for finish coat, n—a calcined
responsibility of the user of this standard to establish appro-
gypsum plaster designed to be mixed with lime putty for the
priate safety, health, and environmental practices and deter-
finish coat.
mine the applicability of regulatory limitations prior to use.
3.2.2 gypsum neat plaster, n—calcined gypsum mixed at the
1.5 This international standard was developed in accor-
mill with other ingredients to control working quality and
dance with internationally recognized principles on standard-
setting time.
ization established in the Decision on Principles for the
3.2.2.1 Discussion—Neat plaster is either fibered or unfi-
Development of International Standards, Guides and Recom-
bered. The addition of aggregate is required on the job.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. 3.2.3 gypsum mill-mixed plaster, n—calcined gypsum
plaster, mixed at the mill with a mineral aggregate, designed to
2. Referenced Documents
function as a base coat to receive various finish coats.
2 3.2.3.1 Discussion—Other materials are not prohibited from
2.1 ASTM Standards:
beingaddedtocontrolsettingtimeandotherdesirableworking
properties.
1 3.2.4 gypsum wood-fibered plaster, n—a calcined gypsum
This specification is under the jurisdiction of ASTM Committee C11 on
Gypsum and Related Building Materials and Systems and is the direct responsibility plaster in which wood fiber is used as an aggregate.
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
Current edition approved June 1, 2020. Published June 2020. Originally 4. Materials
approved in 1920. Last previous edition approved in 2015 as C28/
4.1 Calcined Gypsum—Calcined gypsum shall be manufac-
C28M – 10 (2015). DOI: 10.1520/C0028_C0028M-10R20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or tured from gypsum meeting the requirements of Specification
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
C22/C22M.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 4.2 Vermiculite Aggregate—Specification C35.
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C28/C28M−10 (2020)
TABLE 1 Composition and Physical Properties
B
Composition, Aggregate Per 100 lb
A Compressive Strength,
Setting
...