ASTM C317/C317M-24

Standard Specification for Gypsum Concrete

ABSTRACT
This specification covers mill-mixed gypsum concrete, consisting essentially of calcined gypsum and suitable aggregate, requiring the addition of water only at the job site. Gypsum concrete is intended for use in the construction of poured-in-place roof decks or slabs. Two classes, based on the compressive strength and density, are covered. Gypsum concrete shall consist of calcined gypsum to which are added aggregates, wood chips, or wood shavings in proportion to meet the applicable requirements of this specification. Test method in this specification shall be performed in order to determine the physical properties of the gypsum concrete. Setting time is determined by the Vicat method.
SCOPE
1.1 This specification covers mill-mixed gypsum concrete, consisting essentially of calcined gypsum and suitable aggregate, requiring the addition of water only at the job site. Gypsum concrete is intended for use in the construction of poured-in-place roof decks or slabs. Two classes, based on the compressive strength and density, are covered.  
1.2 The values stated in either inch-pound units or SI units are to be regarded separately as standard. 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 nonconformance with the standard.  
1.3 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-Mar-2024
• 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 C317/C317M-00(2019) - Standard Specification for Gypsum Concrete
• Effective Date: 01-Apr-2024
• Referred By: ASTM C11-23 - Standard Terminology Relating to Gypsum and Related Building Materials and Systems
• Effective Date: 01-Apr-2024
• Referred By: ASTM C471M-24 - Standard Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric)
• Effective Date: 01-Apr-2024
• Referred By: ASTM C956-04(2019) - Standard Specification for Installation of Cast-In-Place Reinforced Gypsum Concrete
• Effective Date: 01-Apr-2024

Overview

ASTM C317/C317M-24: Standard Specification for Gypsum Concrete establishes the requirements for mill-mixed gypsum concrete, which is primarily composed of calcined gypsum and suitable aggregate. The specification guides manufacturers, suppliers, contractors, and regulatory authorities on the proper formulation, physical properties, and methods of testing gypsum concrete, particularly for use in poured-in-place roof decks and slabs.

This standard also addresses different classes based on compressive strength and density, the role of water addition at the job site, and clear requirements for material, packing, and labeling to ensure uniform quality and performance in construction projects.

Key Topics

• Material Composition:

  • Gypsum concrete must consist of calcined gypsum as per ASTM C28/C28M, combined with aggregates conforming to ASTM C35.
  • Optionally, dry, clean, uniformly sized wood chips or shavings may be included to meet performance criteria.

• Classes and Physical Properties:

  • Two classes are defined, primarily based on compressive strength and density.
    • Class A: Compressive strength between 500 psi [3.5 MPa] and 1000 psi [7.0 MPa], maximum density of 60 lb/ft³ [960 kg/m³].
    • Class B: Compressive strength greater than 1000 psi [7.0 MPa].
  • Setting time must be between 20 and 90 minutes, determined by the Vicat method.

• Testing and Quality Control:

  • Sampling and composite sample preparation requirements are specified for representative testing.
  • Physical properties such as setting time, compressive strength, and density are measured according to ASTM C472.

• Packaging and Marking:

  • Gypsum concrete is to be shipped dry, free of lumps, and properly labeled with manufacturer and product details, including weights.

Applications

Gypsum concrete is widely used in modern construction due to its unique performance characteristics:

• Poured-in-Place Roof Decks: Provides a smooth, monolithic base for roofing systems, offering fire resistance and sound insulation.
• Floors and Structural Slabs: Used in multifamily, commercial, and institutional buildings for resilient floor underlayment or topping.
• Lightweight Construction: Particularly suited for projects requiring fire-rated roof or floor assemblies without excessive weight.
• Rapid Installation: The dry, mill-mixed formulation allows for easy, on-site water addition and swift application even across expansive areas.

Contractors and architects rely on ASTM C317/C317M-24 to specify gypsum concrete that complies with recognized strength and density requirements, ensuring safety, consistency, and regulatory compliance in building systems.

Related Standards

This standard references several key ASTM standards integral to gypsum concrete production and quality assurance:

• ASTM C11: Terminology relating to gypsum and related building materials and systems.
• ASTM C28/C28M: Specification for gypsum plasters, defining quality for calcined gypsum components.
• ASTM C35: Specification for inorganic aggregates used in gypsum plasters and concretes.
• ASTM C472: Test methods for physical property evaluation of gypsum products, including setting time and compressive strength.

Compliance with ASTM C317/C317M-24, in combination with these related standards, provides a foundation for durable, high-performing gypsum concrete installations that meet the requirements of engineers, builders, and regulatory authorities worldwide.

Keywords: gypsum concrete, ASTM C317/C317M, calcined gypsum, aggregates, compressive strength, setting time, physical properties, roof decks, floor slabs, building materials standard

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: C317/C317M − 24
Standard Specification for
Gypsum Concrete
This standard is issued under the fixed designation C317/C317M; 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* 4. Materials and Manufacture
1.1 This specification covers mill-mixed gypsum concrete, 4.1 Gypsum concrete shall consist of calcined gypsum to
consisting essentially of calcined gypsum and suitable which is added aggregates, wood chips, or wood shavings in
aggregate, requiring the addition of water only at the job site. proportion to meet the applicable requirements of this specifi-
Gypsum concrete is intended for use in the construction of cation.
poured-in-place roof decks or slabs. Two classes, based on the
4.2 Calcined Gypsum—Specification C28/C28M.
compressive strength and density, are covered.
4.3 Aggregates—Specification C35.
1.2 The values stated in either inch-pound units or SI units
4.4 Wood Chips or Wood Shavings, shall be dry wood,
are to be regarded separately as standard. The values stated in
uniform and clean in appearance, passing a 1-in. [25 mm]
each system may not be exact equivalents; therefore, each
sieve, and not more than ⁄16 in. [1.5 mm] thick.
system shall be used independently of the other. Combining
values from the two systems may result in nonconformance
5. Physical Properties
with the standard.
5.1 Determine the physical properties of gypsum concrete in
1.3 This international standard was developed in accor-
accordance with Test Methods C472.
dance with internationally recognized principles on standard-
5.1.1 Setting Time—Gypsum concrete shall set in not less
ization established in the Decision on Principles for the
than 20 min and not more than 90 min determined by the Vicat
Development of International Standards, Guides and Recom-
method.
mendations issued by the World Trade Organization Technical
5.1.2 Compressive Strength—Gypsum concrete shall have
Barriers to Trade (TBT) Committee.
the following compressive strength for the respective classes:
2. Referenced Documents
2.1 ASTM Standards: Class Compressive Strength,
psi [MPa]
C11 Terminology Relating to Gypsum and Related Building
A 500 [3.5] – 1000 [7.0]
Materials and Systems
B >1000 [7.0]
C28/C28M Specification for Gypsum Plasters
C35 Specification for Inorganic Aggregates for Use in Gyp-
sum Plaster
5.1.3 Density—Gypsum concrete, Class A, shall have a
C472 Test Methods for Physical Testing of Gypsum, Gyp-
3 3
density of not more than 60 lb/ft [960 kg/m ].
sum Plasters, and Gypsum Concrete
6. Sampling
3. Terminology
6.1 Randomly select at least 1 % of the packages, but not
3.1 Definitions of terms shall be in accordance with Termi-
less than five packages. Take samples from both the outer
nology C11.
portion and the center of each package. Mix the samples so
1 obtained to provide a composite sample of not less than 15 lb
This specification is under the jurisdiction of ASTM Committee C11 on
Gypsum and Related Building Materials and Systems and is the direct responsibility [6.5 kg]. Immediately place the sample in a clean, dry, airtight
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Prod
...

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: C317/C317M − 00 (Reapproved 2019) C317/C317M − 24
Standard Specification for
Gypsum Concrete
This standard is issued under the fixed designation C317/C317M; 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 Scope*
1.1 This specification covers mill-mixed gypsum concrete, consisting essentially of calcined gypsum and suitable aggregate,
requiring the addition of water only at the job site. Gypsum concrete is intended for use in the construction of poured-in-place roof
decks or slabs. Two classes, based on the compressive strength and density, are covered.
1.2 The values stated in either inch-pound units or SI units are to be regarded separately as standard. 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 nonconformance with the standard.
1.3 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:
C11 Terminology Relating to Gypsum and Related Building Materials and Systems
C28/C28M Specification for Gypsum Plasters
C35 Specification for Inorganic Aggregates for Use in Gypsum Plaster
C472 Test Methods for Physical Testing of Gypsum, Gypsum Plasters, and Gypsum Concrete
3. Terminology
3.1 Definitions of terms shall be in accordance with Terminology C11.
4. Materials and Manufacture
4.1 Gypsum concrete shall consist of calcined gypsum to which is added aggregates, wood chips, or wood shavings in proportion
to meet the applicable requirements of this specification.
4.2 Calcined Gypsum—Specification C28/C28M.
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, 2019April 1, 2024. Published October 2019April 2024. Originally approved in 1953. Last previous edition approved in 20152019 as
C317C317/C317M – 00 (2015). DOI: 10.1520/C0317_C0317M-00R19. – 00 (2019). DOI: 10.1520/C0317_C0317M-24.
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.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C317/C317M − 24
4.3 Aggregates—Specification C35.
4.4 Wood Chips or Wood Shavings, shall be dry wood, uniform and clean in appearance, passing a 1-in. [25-mm][25 mm] sieve,
and not more than ⁄16 in. [1.5 mm] thick.
5. Physical Properties
5.1 Setting Time—Gypsum concrete shall set in not less than 20 min and not more than 90 min.
5.1 Compressive Strength—Gypsum concrete shall have the following compressive strength for the respective classes:Determine
the physical properties of gypsum concrete in accordance
with
Class Compressive Strength, min,
psi [MPa]
A
...