ASTM C1634-23a
(Specification)Standard Specification for Concrete Facing Brick and Other Concrete Masonry Facing Units
Standard Specification for Concrete Facing Brick and Other Concrete Masonry Facing Units
ABSTRACT
This specification covers solid, dry-cast, concrete facing brick intended for interior and exterior use in constructing structural and facing masonry components and are made from portland cement, water, and suitable mineral aggregates with or without the inclusion of other materials. Concrete facing bricks shall be grouped into density classifications as either lightweight, medium weight, or normal weight. Specimens shall be sampled, tested, and conform accordingly to the specified physical requirements (oven-dry density, maximum water absorption, and minimum net area compressive strength) suitable for their density classification.
SCOPE
1.1 This specification covers solid, dry-cast, concrete facing brick and other solid concrete masonry facing units intended for interior and exterior use in constructing structural and facing masonry components and are made from portland cement, water, and suitable mineral aggregates with or without the inclusion of other materials.
Note 1: Specification C55 addresses concrete building brick used in non-facing, utilitarian applications (previously referred to in earlier editions of Specification C55 as Grade S—for general use where moderate strength and resistance to frost action and moisture penetration are required). This specification differs from Specification C55 in that it includes expanded consideration for properties of concrete units used in facing applications and other exposures (previously referred to in earlier editions of Specification C55 as Grade N—for use as architectural veneer and facing units in exterior walls and for use where high strength and resistance to moisture penetration and severe frost action are desired).
1.2 The text of this specification 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.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
Note 2: Concrete facing brick and other solid concrete masonry facing units covered by this specification are made from lightweight or normal weight aggregates, or both.
Note 3: When particular features are desired, such as density classification, high compressive strength, surface textures for appearance or bond, finish, color, fire resistance, insulation, acoustical properties, or other special features, such properties should be specified separately by the purchaser. Suppliers should be consulted as to the availability of concrete facing brick and other concrete masonry facing units having the desired features.
1.4 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
- 30-Nov-2023
- Technical Committee
- C15 - Masonry – Manufactured Masonry Units, Mortars and Grouts
- Drafting Committee
- C15.03 - Concrete Masonry Units and Related Units
Relations
- Effective Date
- 01-Dec-2023
- Effective Date
- 01-Feb-2024
- Effective Date
- 15-Dec-2023
- Effective Date
- 01-Dec-2023
- Effective Date
- 01-Dec-2023
- Effective Date
- 01-Jun-2023
- Effective Date
- 15-Dec-2022
- Effective Date
- 01-Jul-2022
- Effective Date
- 01-Dec-2021
- Referred By
ASTM C744-21 - Standard Specification for Prefaced Concrete and Calcium Silicate Masonry Units - Effective Date
- 01-Dec-2023
Overview
ASTM C1634-23a, the "Standard Specification for Concrete Facing Brick and Other Concrete Masonry Facing Units," issued by ASTM International, establishes the requirements for solid, dry-cast concrete facing bricks and other masonry facing units. These products are designed for both interior and exterior applications in the construction of structural and facing masonry components. The specification covers units made from portland cement, water, and suitable mineral aggregates, with or without the addition of other approved materials. By providing clear criteria for physical properties, sampling, testing, and appearance, ASTM C1634-23a ensures that concrete facing masonry units meet quality standards suitable for diverse construction environments.
Key Topics
- Density Classifications: Concrete facing bricks are categorized as lightweight, medium weight, or normal weight, each with specified ranges for density, absorption, and compressive strength.
- Materials and Manufacture:
- Units must be made primarily with portland cement, compatible aggregates, and, optionally, pigments or other approved constituents.
- Materials such as blended hydraulic cements, lightweight aggregates, and mineral additives should meet ASTM standards.
- Physical Requirements:
- Specifies requirements for minimum net area compressive strength, maximum water absorption, and oven-dry density for each density class.
- Limits on linear drying shrinkage are included to ensure dimensional stability.
- Dimensional Tolerances:
- Strict guidelines control allowable variations in unit size to ensure uniformity and ease of installation.
- Finish and Appearance:
- Surface finish, color, texture, and permissible variations are set by the purchaser and must be embodied in approved samples.
- Requirements limit visible defects such as chips and cracks, ensuring durable and aesthetically consistent facing units.
- Testing and Compliance:
- Units are sampled and evaluated using referenced ASTM test methods to confirm compliance with performance criteria.
- Provisions allow for retesting if initial samples fail, with additional rules for freight responsibilities on non-conforming shipments.
Applications
ASTM C1634-23a provides confidence and clarity for architects, engineers, contractors, and manufacturers involved in:
- Architectural Veneers: Specified for walls where a durable, visually appealing exterior or interior finish is required.
- Structural Masonry: Used in both load-bearing and non-load-bearing masonry assemblies for strength and longevity.
- Renovation and Restoration: Ideal for use where consistent color, finish, and physical performance are essential to match or enhance existing masonry.
- Commercial and Residential Building: Supports compliance with building codes for projects requiring robust moisture and frost resistance.
- Specialized Facings: Allows for the specification of fire resistance, acoustical performance, integral coloring, and custom finishes as needed.
Conforming to ASTM C1634-23a helps ensure that concrete facing bricks and masonry facing units perform reliably under various environmental and structural demands, supporting both functional and aesthetic project goals.
Related Standards
The following ASTM standards are commonly referenced and provide complementary technical guidance:
- ASTM C33/C33M - Specification for Concrete Aggregates
- ASTM C140/C140M - Sampling and Testing of Concrete Masonry Units
- ASTM C150/C150M - Specification for Portland Cement
- ASTM C331/C331M - Lightweight Aggregates for Concrete Masonry Units
- ASTM C595/C595M - Specification for Blended Hydraulic Cements
- ASTM C979/C979M - Pigments for Integrally Colored Concrete
- ASTM C55 - Specification for Concrete Building Brick (non-facing units)
- ASTM C426 - Linear Drying Shrinkage of Concrete Masonry Units
Keywords: concrete facing brick, concrete masonry units, compressive strength, water absorption, ASTM C1634, density classification, portland cement, masonry standards, structural facing units, architectural veneer, physical requirements.
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Frequently Asked Questions
ASTM C1634-23a is a technical specification published by ASTM International. Its full title is "Standard Specification for Concrete Facing Brick and Other Concrete Masonry Facing Units". This standard covers: ABSTRACT This specification covers solid, dry-cast, concrete facing brick intended for interior and exterior use in constructing structural and facing masonry components and are made from portland cement, water, and suitable mineral aggregates with or without the inclusion of other materials. Concrete facing bricks shall be grouped into density classifications as either lightweight, medium weight, or normal weight. Specimens shall be sampled, tested, and conform accordingly to the specified physical requirements (oven-dry density, maximum water absorption, and minimum net area compressive strength) suitable for their density classification. SCOPE 1.1 This specification covers solid, dry-cast, concrete facing brick and other solid concrete masonry facing units intended for interior and exterior use in constructing structural and facing masonry components and are made from portland cement, water, and suitable mineral aggregates with or without the inclusion of other materials. Note 1: Specification C55 addresses concrete building brick used in non-facing, utilitarian applications (previously referred to in earlier editions of Specification C55 as Grade S—for general use where moderate strength and resistance to frost action and moisture penetration are required). This specification differs from Specification C55 in that it includes expanded consideration for properties of concrete units used in facing applications and other exposures (previously referred to in earlier editions of Specification C55 as Grade N—for use as architectural veneer and facing units in exterior walls and for use where high strength and resistance to moisture penetration and severe frost action are desired). 1.2 The text of this specification 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. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. Note 2: Concrete facing brick and other solid concrete masonry facing units covered by this specification are made from lightweight or normal weight aggregates, or both. Note 3: When particular features are desired, such as density classification, high compressive strength, surface textures for appearance or bond, finish, color, fire resistance, insulation, acoustical properties, or other special features, such properties should be specified separately by the purchaser. Suppliers should be consulted as to the availability of concrete facing brick and other concrete masonry facing units having the desired features. 1.4 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.
ABSTRACT This specification covers solid, dry-cast, concrete facing brick intended for interior and exterior use in constructing structural and facing masonry components and are made from portland cement, water, and suitable mineral aggregates with or without the inclusion of other materials. Concrete facing bricks shall be grouped into density classifications as either lightweight, medium weight, or normal weight. Specimens shall be sampled, tested, and conform accordingly to the specified physical requirements (oven-dry density, maximum water absorption, and minimum net area compressive strength) suitable for their density classification. SCOPE 1.1 This specification covers solid, dry-cast, concrete facing brick and other solid concrete masonry facing units intended for interior and exterior use in constructing structural and facing masonry components and are made from portland cement, water, and suitable mineral aggregates with or without the inclusion of other materials. Note 1: Specification C55 addresses concrete building brick used in non-facing, utilitarian applications (previously referred to in earlier editions of Specification C55 as Grade S—for general use where moderate strength and resistance to frost action and moisture penetration are required). This specification differs from Specification C55 in that it includes expanded consideration for properties of concrete units used in facing applications and other exposures (previously referred to in earlier editions of Specification C55 as Grade N—for use as architectural veneer and facing units in exterior walls and for use where high strength and resistance to moisture penetration and severe frost action are desired). 1.2 The text of this specification 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. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. Note 2: Concrete facing brick and other solid concrete masonry facing units covered by this specification are made from lightweight or normal weight aggregates, or both. Note 3: When particular features are desired, such as density classification, high compressive strength, surface textures for appearance or bond, finish, color, fire resistance, insulation, acoustical properties, or other special features, such properties should be specified separately by the purchaser. Suppliers should be consulted as to the availability of concrete facing brick and other concrete masonry facing units having the desired features. 1.4 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.
ASTM C1634-23a is classified under the following ICS (International Classification for Standards) categories: 91.100.30 - Concrete and concrete products. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM C1634-23a has the following relationships with other standards: It is inter standard links to ASTM C1634-23, ASTM C989/C989M-24, ASTM C1232-23, ASTM C140/C140M-23a, ASTM C55-23, ASTM C140/C140M-23, ASTM C55-22, ASTM C989/C989M-22, ASTM C1232-21a, ASTM C744-21. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM C1634-23a is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
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: C1634 − 23a
Standard Specification for
Concrete Facing Brick and Other Concrete Masonry Facing
Units
This standard is issued under the fixed designation C1634; 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* ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.1 This specification covers solid, dry-cast, concrete facing
mendations issued by the World Trade Organization Technical
brick and other solid concrete masonry facing units intended
Barriers to Trade (TBT) Committee.
for interior and exterior use in constructing structural and
facing masonry components and are made from portland
2. Referenced Documents
cement, water, and suitable mineral aggregates with or without
2.1 ASTM Standards:
the inclusion of other materials.
C33/C33M Specification for Concrete Aggregates
NOTE 1—Specification C55 addresses concrete building brick used in
C55 Specification for Concrete Building Brick
non-facing, utilitarian applications (previously referred to in earlier
C140/C140M Test Methods for Sampling and Testing Con-
editions of Specification C55 as Grade S—for general use where moderate
crete Masonry Units and Related Units
strength and resistance to frost action and moisture penetration are
C150/C150M Specification for Portland Cement
required). This specification differs from Specification C55 in that it
includes expanded consideration for properties of concrete units used in
C331/C331M Specification for Lightweight Aggregates for
facing applications and other exposures (previously referred to in earlier
Concrete Masonry Units
editions of Specification C55 as Grade N—for use as architectural veneer
C426 Test Method for Linear Drying Shrinkage of Concrete
and facing units in exterior walls and for use where high strength and
Masonry Units
resistance to moisture penetration and severe frost action are desired).
C595/C595M Specification for Blended Hydraulic Cements
1.2 The text of this specification references notes and
C618 Specification for Coal Ash and Raw or Calcined
footnotes which provide explanatory material. These notes and
Natural Pozzolan for Use in Concrete
footnotes (excluding those in tables and figures) shall not be
C979/C979M Specification for Pigments for Integrally Col-
considered as requirements of the standard.
ored Concrete
1.3 The values stated in inch-pound units are to be regarded
C989/C989M Specification for Slag Cement for Use in
as standard. The values given in parentheses are mathematical
Concrete and Mortars
conversions to SI units that are provided for information only
C1157/C1157M Performance Specification for Hydraulic
and are not considered standard.
Cement
C1232 Terminology for Masonry
NOTE 2—Concrete facing brick and other solid concrete masonry facing
C1240 Specification for Silica Fume Used in Cementitious
units covered by this specification are made from lightweight or normal
weight aggregates, or both.
Mixtures
NOTE 3—When particular features are desired, such as density
classification, high compressive strength, surface textures for appearance
3. Terminology
or bond, finish, color, fire resistance, insulation, acoustical properties, or
3.1 Terminology defined in Terminology C1232 shall apply
other special features, such properties should be specified separately by
the purchaser. Suppliers should be consulted as to the availability of for this specification.
concrete facing brick and other concrete masonry facing units having the
3.2 Definitions of Terms Specific to This Standard:
desired features.
3.2.1 concrete building brick, n—a concrete masonry unit,
1.4 This international standard was developed in accor-
with a maximum width of four (4) inches and of a weight that
dance with internationally recognized principles on standard-
will typically permit it to be lifted and placed with one hand,
that is manufactured for general use in non-facing, utilitarian
applications.
This specification is under the jurisdiction of ASTM Committee C15 on
Manufactured Masonry Units and is the direct responsibility of Subcommittee
C15.03 on Concrete Masonry Units and Related Units. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 1, 2023. Published December 2023. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2006. Last previous edition approved in 2023 as C1634 – 23. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C1634-23A. 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
C1634 − 23a
3.2.2 concrete facing brick, n—a concrete masonry unit, 5.1.1 When higher compressive strengths than those listed
with a maximum width of four (4) inches and of a weight that in Table 1 are specified, the tested average net area compres-
will typically permit it to be lifted and placed with one hand, sive strength of three units shall equal or exceed the specified
that is manufactured to be typically used in an application compressive strength, and the following single unit strength
where one or more faces of the unit is intended to be exposed. requirements shall apply.
5.1.1.1 When the specified compressive strength is less than
4. Materials and Manufacture
5000 psi, no single unit net area compressive strength test
4.1 Cementitious Materials—Cementitious materials shall
result shall be less than the specified compressive strength
conform to the following applicable specifications:
minus 500 psi. Compressive strength shall be tested in accor-
4.1.1 Portland Cement—Specification C150/C150M. dance with 8.2.
4.1.2 Modified Portland Cement—Portland cement con-
5.1.1.2 When the specified compressive strength is 5000 psi
forming to Specification C150/C150M, modified as follows:
or greater, no single unit net area compressive strength test
(1) Limestone—If calcium carbonate is added to the
result shall be less than 90 % of the specified compressive
cement, the CaCO content shall not be less than 85 %.
3 strength. Compressive strength shall be tested in accordance
(2) Limitation on Insoluble Residue—1.5 %.
with 8.2.
(3) Limitation on Air Content of Mortar—Volume percent,
5.2 At the time of delivery to the purchaser, the average
22 % max.
total linear drying shrinkage of the three units tested shall not
(4) Limitation on Loss on Ignition—7 %.
exceed 0.065 % when tested in accordance with 8.3.
4.1.3 Blended Hydraulic Cements—Specification C595/
NOTE 5—The purchaser is the public body or authority, association,
C595M.
corporation, partnership, or individual entering into a contract or agree-
4.1.4 Hydraulic Cement—Specification C1157/C1157M.
ment to purchase or install, or both, concrete facing brick and other
4.1.5 Pozzolans—Specification C618.
concrete masonry facing units. The time of delivery to the purchaser is
4.1.6 Slag Cement—Specification C989/C989M.
FOB plant when the purchaser or the purchaser’s agent transports the
4.1.7 Silica Fume—Specification C1240. concrete facing brick and other concrete masonry facing units, or at the
time unloaded at the worksite if the manufacturer or the manufacturer’s
4.2 Aggregates—Aggregates shall conform to the following
agent transports the concrete facing brick and other masonry facing units.
specifications, except for grading requirements:
4.2.1 Normal Weight Aggregates—Specification C33/
6. Dimensions and Permissible Variations
C33M.
6.1 No overall dimension (width, height, and length) shall
4.2.2 Lightweight Aggregates—Specification C331/C331M.
differ by more than 6 ⁄8 in. (3.2 mm) from the specified
NOTE 4—The grading requirements of Specifications C33/C33M and
standard dimensions.
C331/C331M may not be suitable for concrete masonry production.
Because of this, producers are allowed to modify grading to meet their
NOTE 6—Standard dimensions of concrete facing brick and other
needs and the requirements of this specification.
concrete masonry facing units are the manufacturer’s designated dimen-
sions. Nominal dimensions of modular size concrete facing brick and
4.3 Pigments for Integrally Colored Concrete—
other concrete masonry facing units are equal to the standard dimensions
Specification C979/C979M.
plus the thickn
...
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: C1634 − 23 C1634 − 23a
Standard Specification for
Concrete Facing Brick and Other Concrete Masonry Facing
Units
This standard is issued under the fixed designation C1634; 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 specification covers solid, dry-cast, concrete facing brick and other solid concrete masonry facing units intended for
interior and exterior use in constructing structural and facing masonry components and are made from portland cement, water, and
suitable mineral aggregates with or without the inclusion of other materials.
NOTE 1—Specification C55 addresses concrete building brick used in non-facing, utilitarian applications (previously referred to in earlier editions of
Specification C55 as Grade S—for general use where moderate strength and resistance to frost action and moisture penetration are required). This
specification differs from Specification C55 in that it includes expanded consideration for properties of concrete units used in facing applications and other
exposures (previously referred to in earlier editions of Specification C55 as Grade N—for use as architectural veneer and facing units in exterior walls
and for use where high strength and resistance to moisture penetration and severe frost action are desired).
1.2 The text of this specification 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.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
NOTE 2—Concrete facing brick and other solid concrete masonry facing units covered by this specification are made from lightweight or normal weight
aggregates, or both.
NOTE 3—When particular features are desired, such as density classification, high compressive strength, surface textures for appearance or bond, finish,
color, fire resistance, insulation, acoustical properties, or other special features, such properties should be specified separately by the purchaser. Suppliers
should be consulted as to the availability of concrete facing brick and other concrete masonry facing units having the desired features.
1.4 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:
C33/C33M Specification for Concrete Aggregates
This specification is under the jurisdiction of ASTM Committee C15 on Manufactured Masonry Units and is the direct responsibility of Subcommittee C15.03 on
Concrete Masonry Units and Related Units.
Current edition approved Jan. 1, 2023Dec. 1, 2023. Published January 2023December 2023. Originally approved in 2006. Last previous edition approved in 20202023
as C1634 – 20.C1634 – 23. DOI: 10.1520/C1634-23.10.1520/C1634-23A.
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
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1634 − 23a
C55 Specification for Concrete Building Brick
C140/C140M Test Methods for Sampling and Testing Concrete Masonry Units and Related Units
C150/C150M Specification for Portland Cement
C331/C331M Specification for Lightweight Aggregates for Concrete Masonry Units
C426 Test Method for Linear Drying Shrinkage of Concrete Masonry Units
C595/C595M Specification for Blended Hydraulic Cements
C618 Specification for Coal Ash and Raw or Calcined Natural Pozzolan for Use in Concrete
C979/C979M Specification for Pigments for Integrally Colored Concrete
C989/C989M Specification for Slag Cement for Use in Concrete and Mortars
C1157/C1157M Performance Specification for Hydraulic Cement
C1232 Terminology for Masonry
C1240 Specification for Silica Fume Used in Cementitious Mixtures
3. Terminology
3.1 Terminology defined in Terminology C1232 shall apply for this specification.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 concrete building brick, n—a concrete masonry unit, with a maximum width of four (4) inches and of a weight that will
typically permit it to be lifted and placed with one hand, that is manufactured for general use in non-facing, utilitarian applications.
3.2.2 concrete facing brick, n—a concrete masonry unit, with a maximum width of four (4) inches and of a weight that will
typically permit it to be lifted and placed with one hand, that is manufactured to be typically used in an application where one or
more faces of the unit is intended to be exposed.
4. Materials and Manufacture
4.1 Cementitious Materials—Materials Cementitious materials shall conform to the following applicable specifications:
4.1.1 Portland Cement—Specification C150/C150M.
4.1.2 Modified Portland Cement—Portland cement conforming to Specification C150/C150M, modified as follows:
(1) Limestone—If calcium carbonate is added to the cement, the CaCO content shall not be less than 85 %.
(2) Limitation on Insoluble Residue—1.5 %.
(3) Limitation on Air Content of Mortar—Volume percent, 22 % max.
(4) Limitation on Loss on Ignition—7 %.
4.1.3 Blended Hydraulic Cements—Specification C595/C595M.
4.1.4 Hydraulic Cement—Specification C1157/C1157M.
4.1.5 Pozzolans—Specification C618.
4.1.6 Blast Furnace Slag Cement—Specification C989/C989M.
4.1.7 Silica Fume—Specification C1240.
4.2 Aggregates—Aggregates shall conform to the following specifications, except for grading requirements:
4.2.1 Normal Weight Aggregates—Specification C33/C33M.
4.2.2 Lightweight Aggregates—Specification C331/C331M.
NOTE 4—The grading requirements of Specifications C33/C33M and C331/C331M may not be suitable for concrete masonry production. Because of this,
producers are allowed to modify grading to meet their needs and the requirements of this specification.
4.3 Pigments for Integrally Colored Concrete—Specification C979/C979M.
C1634 − 23a
4.4 Other Constituents—Air-entraining agents, integral water repellents, and other constituents shall be previously established as
suitable for use in concrete facing brick and other concrete masonry facing units and shall conform to applicable ASTM standards
or shall be shown by test or experience not to be detrimental to the durability of the concrete facing brick or other concrete masonry
facing units or any material customarily used in masonry construction.
5. Physical Requirements
5.1 At the time of delivery to the purchaser, units shall conform to the physical requirements prescribed in Table 1. Units shall
be free of defects that significantly impair the strength or permanence of the construction.
5.1.1 When higher compressive strengths than those listed in Table 1 are specified, the tested average net area compressive
strength of three units shall equal or exceed the specified compressive strength, and the following single unit strength requirements
shall apply.
5.1.1.1 When the specified compressive strength is less than 5000 psi, no single unit net area compressive strength test result shall
be less than the specified compressive strength minus 500 psi. Compressive strength shall be tested in accordance with 8.2.
5.1.1.2 When the specified compressive strength is 5000 psi or greater, no single unit net area compressive strength test result shall
be less than 90 % of the specified compressive strength. Compressive strength shall be tested in accordance with 8.2.
5.2 At the time of delivery to the purchaser, the average total linear drying shrinkage of the three units tested shall not exceed 0.065
% when tested in accordance with 8.3.
NOTE 5—The purchaser is the public body or authority, association, corporation, partnership, or individual entering into a contract or agreement to
purchase or install, or both, concrete facing brick and other concrete masonry
...
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