ASTM C744-21

Standard Specification for Prefaced Concrete and Calcium Silicate Masonry Units

ABSTRACT
This specification covers prefaced concrete and calcium silicate masonry units with the exposed-to-view-in-place surfaces are coated with resin, resin and inert filler, or cement and inert filler during manufacture. The coatings are intended to produce smooth resinous tile facing. Facings should be tested according to the prescribed procedures and should meet the requirements for resistance to crazing, cracking, or spalling, resistance to chemicals, adhesion, abrasion, surface-burning characteristics, color, tint, texture, and soiling and cleansability.
SCOPE
1.1 This specification covers prefaced concrete and calcium silicate masonry units with the finished face(s) covered at the point of manufacture with resin, resin and inert filler, or cement and inert filler to produce a smooth tile-like surface feature. This specification does not address, and therefore is not applicable to, ground-face concrete masonry units that are manufactured by grinding a thin layer off the surface of a concrete masonry unit to expose aggregates within and polishing to produce a smooth, architectural finish.  
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.  
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: 30-Nov-2021
• ICS: 91.100.15 - Mineral materials and products
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: C15 - Manufactured Masonry Units
• Drafting Committee: C15.03 - Concrete Masonry Units and Related Units

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:C744 −21
Standard Specification for
1
Prefaced Concrete and Calcium Silicate Masonry Units
This standard is issued under the fixed designation C744; 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* 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This specification covers prefaced concrete and calcium
C55 Specification for Concrete Building Brick
silicate masonry units with the finished face(s) covered at the
C73 Specification for Calcium Silicate Brick (Sand-Lime
pointofmanufacturewithresin,resinandinertfiller,orcement
Brick)
and inert filler to produce a smooth tile-like surface feature.
C90 Specification for Loadbearing Concrete Masonry Units
This specification does not address, and therefore is not
C129 Specification for Nonloadbearing Concrete Masonry
applicable to, ground-face concrete masonry units that are
Units
manufactured by grinding a thin layer off the surface of a
C140/C140M Test Methods for Sampling and Testing Con-
concrete masonry unit to expose aggregates within and polish-
crete Masonry Units and Related Units
ing to produce a smooth, architectural finish.
C501 Test Method for Relative Resistance to Wear of
Unglazed Ceramic Tile by the Taber Abraser
1.2 The text of this specification references notes and
C1232 Terminology for Masonry
footnotes which provide explanatory material. These notes and
C1634 Specification for Concrete Facing Brick and Other
footnotes (excluding those in tables and figures) shall not be
Concrete Masonry Facing Units
considered as requirements of the standard.
D822/D822M Practice for Filtered Open-Flame Carbon-Arc
1.3 The values stated in inch-pound units are to be regarded
Exposures of Paint and Related Coatings
as standard. The values given in parentheses are mathematical
D2244 Practice for Calculation of Color Tolerances and
conversions to SI units that are provided for information only
Color Differences from Instrumentally Measured Color
and are not considered standard.
Coordinates
D2486 Test Methods for Scrub Resistance of Wall Paints
1.4 This standard does not purport to address all of the
E84 Test Method for Surface Burning Characteristics of
safety concerns, if any, associated with its use. It is the
Building Materials
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
3. Terminology
mine the applicability of regulatory limitations prior to use.
3.1 Terminology defined in Terminology C1232 shall apply
1.5 This international standard was developed in accor-
for this specification.
dance with internationally recognized principles on standard-
3.2 Definitions of Terms Specific to This Standard:
ization established in the Decision on Principles for the
3.2.1 prefaced concrete masonry unit, n—a concrete ma-
Development of International Standards, Guides and Recom-
sonry unit where the finished face(s) are covered at the point of
mendations issued by the World Trade Organization Technical
manufacture with either resin, resin and an inert filler, or
Barriers to Trade (TBT) Committee.
cement and an inert filler to produce a smooth, tile-like surface
feature.
3.2.1.1 Discussion—Some prefaced units may also be re-
ferred to as glazed concrete masonry units.
3.2.2 prefaced calcium silicate masonry unit, n—a calcium
silicate masonry unit where the finished face(s) are covered at
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. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 1973. Last previous edition approved in 2016 as C744 – 16. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C0744-21. 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
1

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C744−21
the point of manufacture with either resin, resin and an inert 6. Dimensional Tolerances
filler,orcementandaninertfillertopro
...

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: C744 − 16 C744 − 21
Standard Specification for
1
Prefaced Concrete and Calcium Silicate Masonry Units
This standard is issued under the fixed designation C744; 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 prefaced concrete and calcium silicate masonry units with the finished face(s) covered at the point
of manufacture with resin, resin and inert filler, or cement and inert filler to produce a smooth tile-like surface feature. This
specification does not address, and therefore is not applicable to, ground-face concrete masonry units that are manufactured by
grinding a thin layer off the surface of a concrete masonry unit to expose aggregates within and polishing to produce a smooth,
architectural finish.
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.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
C55 Specification for Concrete Building Brick
C73 Specification for Calcium Silicate Brick (Sand-Lime Brick)
C90 Specification for Loadbearing Concrete Masonry Units
C129 Specification for Nonloadbearing Concrete Masonry Units
C140C140/C140M Test Methods for Sampling and Testing Concrete Masonry Units and Related Units
C501 Test Method for Relative Resistance to Wear of Unglazed Ceramic Tile by the Taber Abraser
C1232 Terminology for Masonry
C1634 Specification for Concrete Facing Brick and Other Concrete Masonry Facing Units
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 Feb. 1, 2016Dec. 1, 2021. Published February 2016December 2021. Originally approved in 1973. Last previous edition approved in 20142016
as C744 – 14.C744 – 16. DOI: 10.1520/C0744-16.10.1520/C0744-21.
2
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
1

---------------------- Page: 1 ----------------------
C744 − 21
D822D822/D822M Practice for Filtered Open-Flame Carbon-Arc Exposures of Paint and Related Coatings
D2244 Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates
D2486 Test Methods for Scrub Resistance of Wall Paints
E84 Test Method for Surface Burning Characteristics of Building Materials
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 prefaced concrete masonry unit, n—a concrete masonry unit where the finished face(s) are covered at the point of
manufacture with either resin, resin and an inert filler, or cement and an inert filler to produce a smooth, tile-like surface feature.
3.2.1.1 Discussion—
Some prefaced units may also be referred to as glazed concrete masonry units.
3.2.2 prefaced calcium silicate masonry unit, n—a c
...