ASTM C1072-13e1
(Test Method)Standard Test Methods for Measurement of Masonry Flexural Bond Strength
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: C1072 − 13
Standard Test Methods for
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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.
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ε NOTE—Editorially corrected Table X1.1 in March 2014.
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 and health practices and determine the applica-
products after production, or to indicate the bond strength
bility of regulatory limitations prior to use.
(under the given conditions) of a mortar product without
requiring the product to be tested in combination with many
2. Referenced Documents
different units. It is not intended to represent field conditions.
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It uses standard concrete masonry units. Mortars are batched
2.1 ASTM Standards:
by weight equivalents of volume proportions and are mixed to
C67 Test Methods for Sampling and Testing Brick and
a prescribed flow. Prisms are constructed using a jig and are
Structural Clay Tile
bag-cured.
C140 Test Methods for Sampling and Testing Concrete
1.1.2 The second method is the “Test Method for Field-
Masonry Units and Related Units
Prepared Specimens.” Its purpose is to evaluate the bond
C230/C230M Specification for Flow Table for Use in Tests
strength(underthegivenconditions)ofaparticularunit-mortar
of Hydraulic Cement
combination, either for preconstruction evaluation of materials
C270 Specification for Mortar for Unit Masonry
orforqualitycontrolpurposesduringconstruction.Mortarsare
C780 Test Method for Preconstruction and Construction
batched conventionally, and the flow is not prescribed. Prisms
Evaluation of Mortars for Plain and Reinforced Unit
are constructed conventionally (no jig) and are bag-cured.
Masonry
1.1.3 The third method is the “Test Method for Prisms
C1232 Terminology of Masonry
Removed from Existing Masonry.” Its purpose is to evaluate
C1437 Test Method for Flow of Hydraulic Cement Mortar
the bond strength of unit-mortar combinations of prisms cut
C1532 Practice for Selection, Removal, and Shipment of
from existing walls.
Manufactured Masonry Units and Masonry Specimens
1.1.4 The three methods are not consistent, nor are they
from Existing Construction
intended to be. They are intended to be used for three different
2.2 Other Documents:
purposes. To make this clear, the three methods are presented
TMS 402⁄ACI 530⁄ASCE 5 Building Code Requirements
separately.
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for Masonry Structures
1.1.5 AppendixX1suggeststwopossiblecriteriaforassess-
ing the bond strength values obtained using these test methods.
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These test methods are under the jurisdiction of ASTM Committee C15 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Manufactured Masonry Units and are the direct responsibility of Subcommittee contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
C15.04 on Research. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved April 15, 2013. Published April 2013. Originally the ASTM website.
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approved in 1993. Last previous edition approved in 2012 as C1072 – 12. DOI: Available from the Masonry Standards Joint Committee, http://
10.1520/C1072-13E01. www.masonrystandards.org.
*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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C1072 − 13
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