ASTM C28/C28M-10(2015)
(Specification)Standard Specification for Gypsum Plasters
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 paragraph 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:C28/C28M −10 (Reapproved 2015)
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 paragraph 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
(excluding those in tables and figures) shall not be considered
3.1 Definitions—Definitions shall be in accordance with
as requirements of the standard.
Terminology C11.
3.2 Definitions of Terms Specific to This Standard:
1.4 This standard does not purport to address all of the
3.2.1 gypsum gauging plaster for finish coat, n—a calcined
safety concerns, if any, associated with its use. It is the
gypsum plaster designed to be mixed with lime putty for the
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- finish coat.
bility 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
3.2.3 gypsum mill-mixed plaster, n—calcined gypsum
Barriers to Trade (TBT) Committee.
plaster, mixed at the mill with a mineral aggregate, designed to
function as a base coat to receive various finish coats.
2. Referenced Documents
3.2.3.1 Discussion—Other materials are not prohibited from
2
2.1 ASTM Standards:
beingaddedtocontrolsettingtimeandotherdesirableworking
properties.
3.2.4 gypsum wood-fibered plaster, n—a calcined gypsum
1
This specification is under the jurisdiction of ASTM Committee C11 on
plaster in which wood fiber is used as an aggregate.
Gypsum and Related Building Materials and Systems and is the direct responsibility
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
Current edition approved Oct. 1, 2015. Published October 2015. Originally 4. Materials
approved in 1920. Last previous edition approved in 2010 as C28/C28M – 10. DOI:
4.1 Calcined Gypsum—Calcined gypsum shall be manufac-
10.1520/C0028_C0028M-10R15.
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 service@astm.org. 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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C28/C28M−10 (2015)
4.3 Perlite Aggregate, Specification C35. 7. Sampling
4.4 Sand Aggregate, Specification C35.
7.1 At least 1 % of the packages, but not less than 5
packages, shall be sampled. Packages to be sampled shall be
4.5 Ottawa Sand, Specification C778 for 20–30 sand.
selected at random. Samples shall be taken bot
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
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: C28/C28M − 10 C28/C28M − 10 (Reapproved 2015)
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
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
paragraph 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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
C11 Terminology Relating to Gypsum and Related Building Materials and Systems
C22/C22M Specification for Gypsum
C35 Specification for Inorganic Aggregates for Use in Gypsum Plaster
C471M Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric)
C472 Test Methods for Physical Testing of Gypsum, Gypsum Plasters and Gypsum Concrete
C778 Specification for Sand
C842 Specification for Application of Interior Gypsum Plaster
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
3. Terminology
3.1 Definitions—Definitions shall be in accordance with Terminology C11.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 gypsum gauging plaster for finish coat, n—a calcined gypsum plaster designed to be mixed with lime putty for the finish
coat.
3.2.2 gypsum neat plaster, n—calcined gypsum mixed at the mill with other ingredients to control working quality and setting
time.
1
This specification is under the jurisdiction of ASTM Committee C11 on Gypsum and Related Building Materials and Systems and is the direct responsibility of
Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
Current edition approved Oct. 1, 2010. Published November 2010October 2015. Originally approved in 1920. Last previous edition approved in 20052010 as
C28/C28M–00(2005).C28/C28M – 10. DOI: 10.1520/C0028_C0028M-10.10.1520/C0028_C0028M-10R15.
2
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.
3.2.2.1 Discussion—
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C28/C28M − 10 (2015)
Neat plaster is either fibered or unfibered. The addition of aggregate is required on the job.
3.2.3 gypsum mill-mixed plaster, n—calcined gypsum plaster, mixed at the mill with a mineral aggregate, designed to function
as a base coat to receive various finish coats.
3.2.3.1 Discussion—
Other materials are not prohibited from being added to control setting time and other desirable working properties.
3.2.4 gypsum wood-fibered plaster, n—a calcined gypsum plaster in which wood fiber is used as an aggregate.
4. Materials
4.1 Calcined Gypsum—Calcined gypsum shall be manufactured from gypsum meeting the requirements of Specification
C22/C22M.
4.2 Vermiculite Aggregate, Specification C35.
4.3 Perlite Aggregate, Specification C35.
4.4 Sand Aggregate, Specification C35.
4.5 Ottawa Sand, Specification C778 for 20–30 sand.
4.6 Wood Fiber, non staining wood fiber.
5. Composition
1
5.1 When tested in accordance with Test Methods C471M, calcined gypsum shall contain no less than 66.0
...
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