ASTM C90-21
(Specification)Standard Specification for Loadbearing Concrete Masonry Units
Standard Specification for Loadbearing Concrete Masonry Units
ABSTRACT
This specification covers hollow and solid concrete masonry units made from hydraulic cement, water, and mineral aggregates with or without the inclusion of other materials. There are three classes of concrete masonry units: normal weight, medium weight, and lightweight. These units are suitable for both loadbearing and nonloadbearing applications. Concrete masonry units shall be made from lightweight or normal weight aggregates, or both.
SCOPE
1.1 This specification covers hollow and solid (see 5.3 and 5.4) concrete masonry units made from hydraulic cement, water, and mineral aggregates with or without the inclusion of other materials. There are three classes of concrete masonry units: Normal Weight, Medium Weight, and Lightweight. These units are suitable for both loadbearing and nonloadbearing applications.
1.2 Concrete masonry units covered by this specification are made from lightweight or normal weight aggregates, or both.
Note 1: The requirements of this specification have been researched, evaluated, and established for over a century, resulting in the physical properties and attributes defined here. These requirements are uniquely and solely applicable to concrete masonry units manufactured on equipment using low or zero slump concrete and the constituent materials defined herein. Many performance attributes of concrete masonry units are indirectly accounted for, or inherently reflected within, the requirements of this specification without direct measurement, assessment, or evaluation. Applying the requirements of this specification to products that may be similar in appearance, use, or nature to those covered by this specification may not address all pertinent physical properties necessary to ensure performance or serviceability of the resulting construction in real-world applications under typical exposure environments. Products manufactured using alternative materials, manufacturing methods, or curing processes not covered by this specification should not be evaluated solely using the requirements in this specification; however, developers of new products can consider the property requirements of this specification as a beginning benchmark for unit performance. It is reasonable to test new products for system performance as well as unit performance.
1.3 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.
1.4 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: When particular features are desired such as surface textures for appearance or bond, finish, color, or particular properties such as density classification, higher compressive strength, fire resistance, thermal performance or acoustical performance, these features should be specified separately by the purchaser. Suppliers should be consulted as to the availability of units having the desired features.
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.
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Designation:C90 −21
Standard Specification for
1
Loadbearing Concrete Masonry Units
This standard is issued under the fixed designation C90; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
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.
for appearance or bond, finish, color, or particular properties such as
1. Scope*
density classification, higher compressive strength, fire resistance, thermal
1.1 This specification covers hollow and solid (see 5.3 and
performance or acoustical performance, these features should be specified
5.4) concrete masonry units made from hydraulic cement, separately by the purchaser. Suppliers should be consulted as to the
availability of units having the desired features.
water, and mineral aggregates with or without the inclusion of
other materials. There are three classes of concrete masonry 1.5 This international standard was developed in accor-
units: Normal Weight, Medium Weight, and Lightweight.
dance with internationally recognized principles on standard-
These units are suitable for both loadbearing and nonloadbear- ization established in the Decision on Principles for the
ing applications.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
1.2 Concretemasonryunitscoveredbythisspecificationare
Barriers to Trade (TBT) Committee.
made from lightweight or normal weight aggregates, or both.
NOTE 1—The requirements of this specification have been researched,
2. Referenced Documents
evaluated, and established for over a century, resulting in the physical
properties and attributes defined here. These requirements are uniquely 2
2.1 ASTM Standards:
and solely applicable to concrete masonry units manufactured on equip-
C33/C33M Specification for Concrete Aggregates
ment using low or zero slump concrete and the constituent materials
C140/C140M Test Methods for Sampling and Testing Con-
definedherein.Manyperformanceattributesofconcretemasonryunitsare
indirectly accounted for, or inherently reflected within, the requirements
crete Masonry Units and Related Units
of this specification without direct measurement, assessment, or evalua-
C150/C150M Specification for Portland Cement
tion.Applying the requirements of this specification to products that may
C331/C331M Specification for Lightweight Aggregates for
be similar in appearance, use, or nature to those covered by this
Concrete Masonry Units
specificationmaynotaddressallpertinentphysicalpropertiesnecessaryto
ensure performance or serviceability of the resulting construction in C426 Test Method for Linear Drying Shrinkage of Concrete
real-world applications under typical exposure environments. Products
Masonry Units
manufactured using alternative materials, manufacturing methods, or
C595/C595M Specification for Blended Hydraulic Cements
curing processes not covered by this specification should not be evaluated
C618 Specification for Coal Fly Ash and Raw or Calcined
solely using the requirements in this specification; however, developers of
Natural Pozzolan for Use in Concrete
new products can consider the property requirements of this specification
as a beginning benchmark for unit performance. It is reasonable to test C979/C979M Specification for Pigments for Integrally Col-
new products for system performance as well as unit performance.
ored Concrete
C989/C989M Specification for Slag Cement for Use in
1.3 The text of this specification references notes and
Concrete and Mortars
footnotes which provide explanatory material. These notes and
C1157/C1157M Performance Specification for Hydraulic
footnotes (excluding those in tables and figures) shall not be
Cement
considered as requirements of the standard.
C1232 Terminology for Masonry
1.4 The values stated in inch-pound units are to be regarded
C1240 Specification for Silica Fume Used in Cementitious
as standard. The values given in parentheses are mathematical
Mixtures
conversions to SI units that are provided for information only
C1314 Test Method for Compressive Strength of Masonry
and are not considered standard.
Prisms
NOTE 2—When particular features are desired such as surface textures
E519/E519M Test Method for Diagonal Tension (Shear) in
Masonry Assemblages
1
This specification is under the jurisdiction of ASTM Committee C15 on
Manufactured Masonry Units and is the direct responsibility of Subcommittee
2
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, 2021. Published December 2021. Originall
...
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: C90 − 16a C90 − 21
Standard Specification for
1
Loadbearing Concrete Masonry Units
This standard is issued under the fixed designation C90; 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 hollow and solid (see 5.3 and 5.4) concrete masonry units made from hydraulic cement, water, and
mineral aggregates with or without the inclusion of other materials. There are three classes of concrete masonry units: Normal
Weight, Medium Weight, and Lightweight. These units are suitable for both loadbearing and nonloadbearing applications.
1.2 Concrete masonry units covered by this specification are made from lightweight or normal weight aggregates, or both.
NOTE 1—The requirements of this specification have been researched, evaluated, and established for over a century, resulting in the physical properties
and attributes defined here. These requirements are uniquely and solely applicable to concrete masonry units manufactured on equipment using low or
zero slump concrete and the constituent materials defined herein. Many performance attributes of concrete masonry units are indirectly accounted for,
or inherently reflected within, the requirements of this specification without direct measurement, assessment, or evaluation. Applying the requirements
of this specification to products that may be similar in appearance, use, or nature to those covered by this specification may not address all pertinent
physical properties necessary to ensure performance or serviceability of the resulting construction in real-world applications under typical exposure
environments. Products manufactured using alternative materials, manufacturing methods, or curing processes not covered by this specification should
not be evaluated solely using the requirements in this specification; however, developers of new products can consider the property requirements of this
specification as a beginning benchmark for unit performance. It is reasonable to test new products for system performance as well as unit performance.
1.3 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.
1.4 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—When particular features are desired such as surface textures for appearance or bond, finish, color, or particular properties such as density
classification, higher compressive strength, fire resistance, thermal performance or acoustical performance, these features should be specified separately
by the purchaser. Suppliers should be consulted as to the availability of units having the desired features.
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.
1
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 Dec. 15, 2016Dec. 1, 2021. Published January 2017December 2021. Originally approved in 1931. Last previous edition approved in 2016 as
C90 – 15.C90 – 16a. DOI: 10.1520/C0090-16A.10.1520/C0090-21.
*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
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C90 − 21
2. Referenced Documents
2
2.1 ASTM Standards:
C33/C33M Specification for Concrete Aggregates
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 f
...
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