ASTM C1072-19

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 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.  
1.3 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.  
1.4 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: Historical
• Publication Date: 30-Nov-2019
• ICS: 91.060.10 - Walls. Partitions. Facades
• Technical Committee: C15 - Manufactured Masonry Units
• Drafting Committee: C15.04 - Research

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C1072 − 19
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,
normal to the bed joints, of masonry built of manufactured
1.2 The values stated in inch-pound units are to be regarded
masonryunits.Samplingandtestingproceduresarereferenced,
asthestandard.Thevaluesgiveninparenthesesaremathemati-
and terms are defined. Three different specimen fabrication
cal conversions to SI units that are provided for information
methods are specified, each for a different purpose:
only and are not considered standard.
1.1.1 The first method is the “Test Method for Laboratory-
1.3 This standard does not purport to address all of the
Prepared Specimens.” Its purpose is to compare the bond
safety concerns, if any, associated with its use. It is the
strengths (under the given conditions) of masonry mortars. It
responsibility of the user of this standard to establish appro-
could be used, for example, to check the quality of mortar
priate safety, health, and environmental practices and deter-
products after production, or to indicate the bond strength
mine the applicability of regulatory limitations prior to use.
(under the given conditions) of a mortar product without
1.4 This international standard was developed in accor-
requiring the product to be tested in combination with many
dance with internationally recognized principles on standard-
different units. It is not intended to represent field conditions.
ization established in the Decision on Principles for the
It uses standard concrete masonry units. Mortars are batched
Development of International Standards, Guides and Recom-
by weight equivalents of volume proportions and are mixed to
mendations issued by the World Trade Organization Technical
a prescribed flow. Prisms are constructed using a jig and are
bag-cured. Barriers to Trade (TBT) Committee.
1.1.2 The second method is the “Test Method for Field-
Prepared Specimens.” Its purpose is to evaluate the bond 2. Referenced Documents
strength(underthegivenconditions)ofaparticularunit-mortar
2
2.1 ASTM Standards:
combination, either for preconstruction evaluation of materials
C67/C67M Test Methods for Sampling and Testing Brick
orforqualitycontrolpurposesduringconstruction.Mortarsare
and Structural Clay Tile
batched conventionally, and the flow is not prescribed. Prisms
C140/C140M Test Methods for Sampling and Testing Con-
are constructed conventionally (no jig) and are bag-cured.
crete Masonry Units and Related Units
1.1.3 The third method is the “Test Method for Prisms
C230/C230M Specification for Flow Table for Use in Tests
Removed from Existing Masonry.” Its purpose is to evaluate
of Hydraulic Cement
the bond strength of unit-mortar combinations of prisms cut
C270 Specification for Mortar for Unit Masonry
from existing walls.
C780 Test Method for Preconstruction and Construction
1.1.4 The three methods are not consistent, nor are they
Evaluation of Mortars for Plain and Reinforced Unit
intended to be. They are intended to be used for three different
Masonry
purposes. To make this clear, the three methods are presented
C1232 Terminology for Masonry
separately.
C1437 Test Method for Flow of Hydraulic Cement Mortar
1.1.5 AppendixX1suggeststwopossiblecriteriaforassess-
C1532/C1532M Practice for Selection, Removal, and Ship-
ing the bond strength values obtained using these test methods.
mentofManufacturedMasonryUnitsandMasonrySpeci-
mens from Existing Construction
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, 2019. Published December 2019. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
ɛ1
approved in 1993. Last previous edition approved in 2013 as C1072 – 13 . DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C1072-19. 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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...

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.
´1
Designation: C1072 − 13 C1072 − 19
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
ε NOTE—Editorially corrected Table X1.1 in March 2014.
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 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.
1.3 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
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
2.1 ASTM Standards:
C67C67/C67M Test Methods for Sampling and Testing Brick and Structural Clay Tile
C140C140/C140M Test Methods for Sampling and Testing Concrete Masonry Units and Related Units
C230/C230M Specification for Flow Table for Use in Tests of Hydraulic Cement
C270 Specification for Mortar for Unit Masonry
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 April 15, 2013Dec. 1, 2019. Published April 2013December 2019. Originally approved in 1993. Last previous edition approved in 20122013
ɛ1
as C1072 – 12.C1072 – 13 . DOI: 10.1520/C1072-13E01.10.1520/C1072-19.
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 In
...