ASTM C1072-22

Standard Test Methods for Measurement of Masonry Flexural Bond Strength

SIGNIFICANCE AND USE
5.1 This test method is intended for use in comparing the bond strengths (under the given conditions) of masonry mortars.  
5.2 This test method could be used, for example, to check one aspect of the quality of mortar products after production, or to indicate the bond potential of a mortar product without requiring the product to be tested in combination with many different units.  
5.3 This test method uses controlled conditions of fabrication and curing that are not intended to represent field conditions.  
5.4 This test method uses standard concrete masonry units. Mortars are batched by weight equivalents of volume proportions and are mixed to a prescribed flow. Prisms are constructed using a jig and are bag-cured.  
5.5 Flexural bond strength determined by this test method shall not be interpreted as the flexural bond strength of a wall (because standard units are not used for wall construction), nor shall it be interpreted as an indication of extent of bond for purposes of water permeability evaluation.
SCOPE
1.1 These test methods evaluate the flexural bond strength, normal to the bed joints, of masonry built of manufactured masonry units. Sampling and testing procedures are referenced, and terms are defined. Three different specimen fabrication methods are specified, each for a different purpose:  
1.1.1 The first method is the “Test Method for Laboratory-Prepared Specimens.” Its purpose is to compare the bond strengths (under the given conditions) of masonry mortars. It could be used, for example, to check the quality of mortar products after production, or to indicate the bond strength (under the given conditions) of a mortar product without requiring the product to be tested in combination with many different units. It is not intended to represent field conditions. It uses standard concrete masonry units. Mortars are batched by weight equivalents of volume proportions and are mixed to a prescribed flow. Prisms are constructed using a jig and are bag-cured.  
1.1.2 The second method is the “Test Method for Field-Prepared Specimens.” Its purpose is to evaluate the bond strength (under the given conditions) of a particular unit-mortar combination, either for preconstruction evaluation of materials or for quality control purposes during construction. Mortars are batched conventionally, and the flow is not prescribed. Prisms are constructed conventionally (no jig) and are bag-cured.  
1.1.3 The third method is the “Test Method for Prisms Removed from Existing Masonry.” Its purpose is to evaluate the bond strength of unit-mortar combinations of prisms cut from existing walls.  
1.1.4 The three methods are not consistent, nor are they intended to be. They are intended to be used for three different purposes. To make this clear, the three methods are presented separately.  
1.1.5 Appendix X1 suggests two possible criteria for assessing the bond strength values obtained using these test methods. These possible evaluation criteria are given for illustration only and are not mandatory.  
1.2 The text of this standard refers to notes and footnotes that 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 the 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 Princip...

General Information

• Status: Published
• Publication Date: 30-Nov-2022
• ICS: 91.060.10 - Walls. Partitions. Facades
• Technical Committee: C15 - Manufactured Masonry Units
• Drafting Committee: C15.04 - Research

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: C1072 − 22
Standard Test Methods for
1
Measurement of Masonry Flexural Bond Strength
This standard is issued under the fixed designation C1072; 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* Thesepossibleevaluationcriteriaaregivenforillustrationonly
and are not mandatory.
1.1 These test methods evaluate the flexural bond strength,
1.2 The text of this standard refers to notes and footnotes
normal to the bed joints, of masonry built of manufactured
that provide explanatory material. These notes and footnotes
masonryunits.Samplingandtestingproceduresarereferenced,
(excluding those in tables and figures) shall not be considered
and terms are defined. Three different specimen fabrication
as requirements of the standard.
methods are specified, each for a different purpose:
1.1.1 The first method is the “Test Method for Laboratory-
1.3 The values stated in inch-pound units are to be regarded
Prepared Specimens.” Its purpose is to compare the bond
asthestandard.Thevaluesgiveninparenthesesaremathemati-
strengths (under the given conditions) of masonry mortars. It
cal conversions to SI units that are provided for information
could be used, for example, to check the quality of mortar
only and are not considered standard.
products after production, or to indicate the bond strength
1.4 This standard does not purport to address all of the
(under the given conditions) of a mortar product without
safety concerns, if any, associated with its use. It is the
requiring the product to be tested in combination with many
responsibility of the user of this standard to establish appro-
different units. It is not intended to represent field conditions.
priate safety, health, and environmental practices and deter-
It uses standard concrete masonry units. Mortars are batched
mine the applicability of regulatory limitations prior to use.
by weight equivalents of volume proportions and are mixed to
1.5 This international standard was developed in accor-
a prescribed flow. Prisms are constructed using a jig and are
dance with internationally recognized principles on standard-
bag-cured.
ization established in the Decision on Principles for the
1.1.2 The second method is the “Test Method for Field-
Development of International Standards, Guides and Recom-
Prepared Specimens.” Its purpose is to evaluate the bond
mendations issued by the World Trade Organization Technical
strength(underthegivenconditions)ofaparticularunit-mortar
Barriers to Trade (TBT) Committee.
combination, either for preconstruction evaluation of materials
orforqualitycontrolpurposesduringconstruction.Mortarsare
2. Referenced Documents
batched conventionally, and the flow is not prescribed. Prisms
2
2.1 ASTM Standards:
are constructed conventionally (no jig) and are bag-cured.
C67/C67M Test Methods for Sampling and Testing Brick
1.1.3 The third method is the “Test Method for Prisms
and Structural Clay Tile
Removed from Existing Masonry.” Its purpose is to evaluate
C140/C140M Test Methods for Sampling and Testing Con-
the bond strength of unit-mortar combinations of prisms cut
crete Masonry Units and Related Units
from existing walls.
C230/C230M Specification for Flow Table for Use in Tests
1.1.4 The three methods are not consistent, nor are they
of Hydraulic Cement
intended to be. They are intended to be used for three different
C270 Specification for Mortar for Unit Masonry
purposes. To make this clear, the three methods are presented
C780 Test Method for Preconstruction and Construction
separately.
Evaluation of Mortars for Plain and Reinforced Unit
1.1.5 AppendixX1suggeststwopossiblecriteriaforassess-
Masonry
ing the bond strength values obtained using these test methods.
C1232 Terminology for Masonry
C1437 Test Method for Flow of Hydraulic Cement Mortar
1
These test methods are under the jurisdiction of ASTM Committee C15 on
Manufactured Masonry Units and are the direct responsibility of Subcommittee
2
C15.04 on Research. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 1, 2022. Published December 2022. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 1993. Last previous edition approved in 2019 as C1072 – 19. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C10
...

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: C1072 − 19 C1072 − 22
Standard Test Methods for
1
Measurement of Masonry Flexural Bond Strength
This standard is issued under the fixed designation C1072; 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 These test methods evaluate the flexural bond strength, normal to the bed joints, of masonry built of manufactured masonry
units. Sampling and testing procedures are referenced, and terms are defined. Three different specimen fabrication methods are
specified, each for a different purpose:
1.1.1 The first method is the “Test Method for Laboratory-Prepared Specimens.” Its purpose is to compare the bond strengths
(under the given conditions) of masonry mortars. It could be used, for example, to check the quality of mortar products after
production, or to indicate the bond strength (under the given conditions) of a mortar product without requiring the product to be
tested in combination with many different units. It is not intended to represent field conditions. It uses standard concrete masonry
units. Mortars are batched by weight equivalents of volume proportions and are mixed to a prescribed flow. Prisms are constructed
using a jig and are bag-cured.
1.1.2 The second method is the “Test Method for Field-Prepared Specimens.” Its purpose is to evaluate the bond strength (under
the given conditions) of a particular unit-mortar combination, either for preconstruction evaluation of materials or for quality
control purposes during construction. Mortars are batched conventionally, and the flow is not prescribed. Prisms are constructed
conventionally (no jig) and are bag-cured.
1.1.3 The third method is the “Test Method for Prisms Removed from Existing Masonry.” Its purpose is to evaluate the bond
strength of unit-mortar combinations of prisms cut from existing walls.
1.1.4 The three methods are not consistent, nor are they intended to be. They are intended to be used for three different purposes.
To make this clear, the three methods are presented separately.
1.1.5 Appendix X1 suggests two possible criteria for assessing the bond strength values obtained using these test methods. These
possible evaluation criteria are given for illustration only and are not mandatory.
1.2 The text of this standard refers to notes and footnotes that 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 the standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1
These test methods are under the jurisdiction of ASTM Committee C15 on Manufactured Masonry Units and are the direct responsibility of Subcommittee C15.04 on
Research.
Current edition approved Dec. 1, 2019Dec. 1, 2022. Published December 2019December 2022. Originally approved in 1993. Last previous edition approved in 20132019
ɛ1
as C1072 – 13C1072 . – 19. DOI: 10.1520/C1072-19.10.1520/C1072-22.
*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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C1072 − 22
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:
C67/C67M Test Methods for Sampling and Testing Brick and Structural Clay Tile
C140/C140M Test Methods for Sampling and Testing Concrete Masonry Units and Related Units
C230/C230M Specification for Flow Table for Use in Tests of Hydrau
...