ASTM C1072-06
(Test Method)Standard Test Method for Measurement of Masonry Flexural Bond Strength
Standard Test Method for Measurement of Masonry Flexural Bond Strength
SIGNIFICANCE AND USE
This test method is intended to provide a simple and economical means for the determination of comparative values of flexural bond strength. It may be used either on specimens especially fabricated for bond strength evaluation or on specimens cut from existing masonry.
The bond strengths determined from this test method can be used as a means of evaluating the compatibility of mortars and masonry units. It may also be used to determine the effect on flexural bond strength of such factors as masonry unit and mortar properties, workmanship, curing conditions, coatings on masonry units, or any other factors that may be of concern.
Flexural bond strength determined by this test method should not be interpreted as the flexural bond strength of a wall constructed of the same material. However, results may be used to predict the flexural strength of a wall. Nor should it be interpreted as an indication of extent of bond for purposes of water permeance evaluation.
SCOPE
1.1 This test method covers the determination of flexural bond strength of nonreinforced masonry by physical testing of each joint of masonry prisms.
1.2This 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:C1072–06
Standard Test Method 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 Department of Defense.
1. Scope* especially fabricated for bond strength evaluation or on speci-
mens cut from existing masonry.
1.1 This test method covers the determination of flexural
3.2 The bond strengths determined from this test method
bond strength of nonreinforced masonry by physical testing of
can be used as a means of evaluating the compatibility of
each joint of masonry prisms.
mortars and masonry units. It may also be used to determine
1.2 This standard does not purport to address all of the
the effect on flexural bond strength of such factors as masonry
safety concerns, if any, associated with its use. It is the
unit and mortar properties, workmanship, curing conditions,
responsibility of the user of this standard to establish appro-
coatings on masonry units, or any other factors that may be of
priate safety and health practices and determine the applica-
concern.
bility of regulatory limitations prior to use.
3.3 Flexural bond strength determined by this test method
2. Referenced Documents
should not be interpreted as the flexural bond strength of a wall
2
constructed of the same material. However, results may be
2.1 ASTM Standards:
used to predict the flexural strength of a wall. Nor should it be
C67 Test Methods for Sampling and Testing Brick and
interpreted as an indication of extent of bond for purposes of
Structural Clay Tile
water permeance evaluation.
C140 Test Methods for Sampling and Testing Concrete
Masonry Units and Related Units
4. Apparatus
C270 Specification for Mortar for Unit Masonry
4.1 The test apparatus is shown in Figs. 1-4. The upper and
C780 Test Method for Preconstruction and Construction
lower clamping mechanisms shall be constructed as shown,
Evaluation of Mortars for Plain and Reinforced Unit
except that the hex head bolts are permitted to be replaced by
Masonry
other tightening devices of equal, or greater, strength and
C1357 Test Methods for Evaluating Masonry Bond
stiffness. The support frame shall be constructed as shown or
Strength
shall be constructed using configurations and materials of
C1532 Practice for Selection, Removal, and Shipment of
equal, or greater, strength and stiffness. The testing apparatus
Manufactured Masonry Units and Masonry Specimens
shall be constructed to apply the load vertically downward on
from Existing Construction
the upper clamping system in such a manner that the upper and
3. Significance and Use
lower clamp do not come in contact during the tests.The prism
support system shall be able to accommodate the size of the
3.1 This test method is intended to provide a simple and
prism to be tested.
economical means for the determination of comparative values
of flexural bond strength. It may be used either on specimens
5. Sampling and Testing
5.1 Brick Masonry Units—Representative brick masonry
units shall be sampled and tested in accordance with Test
1
This test method is under the jurisdiction of ASTM Committee C15 on
Methods C67.
Manufactured Masonry Units and is the direct responsibility of Subcommittee
C15.04 on Research.
NOTE 1—Brick properties for which there are methods of test in Test
Current edition approved June 1, 2006. Published June 2006. Originally
Methods C67 that may be of interest are cold-water absorption, boiling-
approved in 1993. Last previous edition approved in 2005 as C1072–05b. DOI:
water absorption, initial rate of absorption, and compressive strength.
10.1520/C1072-06.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.2 Concrete Masonry Units—Representative concrete ma-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
sonry units shall be sampled and tested in accordance withTest
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Methods C140.
*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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C1072–06
FIG. 1 Bond Wrench Testing Apparatus
5.3 Mortar—When mortar property testing is specified, the 6.3.1.4 Repeat 6.3.1.2 and 6.3.1.3 until the prisms are the
compressivestrength,aircontent,initialflow,conepenetration, desired height. Identify all specimens using a water-resis
...
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:C1072–05b Designation:C1072–06
Standard Test Method for
1
Measurement of Masonry Flexural Bond Strength
This standard is issued under the fixed designation C 1072; 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 Department of Defense.
1. Scope*
1.1 This test method covers the determination of flexural bond strength of nonreinforced masonry by physical testing of each
joint of masonry prisms.
1.2 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C67 Test Methods of Sampling and Testing Brick and Structural Clay Tile
C 140 Test Methods of Sampling and Testing Concrete Masonry Units
C 270 Specification for Mortar for Unit Masonry
C 780 Test Method for Preconstruction and Construction Evaluation of Mortars for Plain and Reinforced Unit Masonry
C 1357 Test Methods for Evaluating Masonry Bond Strength
C 1532 Practice for Selection, Removal, and Shipment of Masonry Assemblage Specimens from Existing Construction
3. Significance and Use
3.1 This test method is intended to provide a simple and economical means for the determination of comparative values of
flexural bond strength. It may be used either on specimens especially fabricated for bond strength evaluation or on specimens cut
from existing masonry.
3.2 The bond strengths determined from this test method can be used as a means of evaluating the compatibility of mortars and
masonry units. It may also be used to determine the effect on flexural bond strength of such factors as masonry unit and mortar
properties, workmanship, curing conditions, coatings on masonry units, or any other factors that may be of concern.
3.3 Flexural bond strength determined by this test method should not be interpreted as the flexural bond strength of a wall
constructed of the same material. However, results may be used to predict the flexural strength of a wall. Nor should it be
interpreted as an indication of extent of bond for purposes of water permeance evaluation.
4. Apparatus
4.1 The test apparatus is shown in Figs. 1-4. The upper and lower clamping mechanisms shall be constructed as shown, except
that the hex head bolts are permitted to be replaced by other tightening devices of equal, or greater, strength and stiffness. The
supportframeshallbeconstructedasshownorshallbeconstructedusingconfigurationsandmaterialsofequal,orgreater,strength
and stiffness. The testing apparatus shall be constructed to apply the load vertically downward on the upper clamping system in
such a manner that the upper and lower clamp do not come in contact during the tests. The prism support system shall be able to
accommodate the size of the prism to be tested.
5. Sampling and Testing
5.1 Brick Masonry Units—Representative brick masonry units shall be sampled and tested in accordance with Test Methods
C 67.
NOTE 1—Brick properties for which there are methods of test in Test Methods C 67 that may be of interest are cold-water absorption, boiling-water
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC15onManufacturedMasonryUnitsandisthedirectresponsibilityofSubcommitteeC15.04onResearch.
Current edition approved Nov. 15, 2005.June 1, 2006. Published December 2005.June 2006. Originally approved in 1993. Last previous edition approved in 2005 as
C 1072–05ab.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. ForAnnualBookofASTMStandards
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 ----------------------
C1072–06
FIG. 1 Bond Wrench Testing Apparatus
absorption, initial rate of absorption, and compressive strength.
5.2 Concrete Masonry Units—Representative concrete masonry units shall be sampled and tested in accordance with Test
Methods C 140.
5.3 Mortar—When
...
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