ASTM C198-09(2019)
(Test Method)Standard Test Method for Cold Bonding Strength of Refractory Mortar
Standard Test Method for Cold Bonding Strength of Refractory Mortar
SIGNIFICANCE AND USE
3.1 The data developed by this test method show the bonding strength and intrinsic strength of different qualities of air-setting mortar. The procedures described in this test method measure the bonding strength and intrinsic strength of air-setting mortars when used with specific brands or lots of refractory brick.
3.2 Note that it is possible to obtain results with these methods for brick and mortar combinations which are incompatible for use at high operating temperatures. The user must determine this compatibility. Only brick and mortar combinations known or intended to be compatible for a particular use should be tested.
3.3 Properties of the brick, including its strength, apparent porosity, and pore size distribution, can affect the measurement of both the bonding strength of the brick-mortar composite and the intrinsic strength of the mortar. The average modulus of rupture of the test brick, as determined by Test Methods C133, should exceed that expected for the mortar being tested. The testing of specific brands or lots of brick and mortar is preferred.
3.4 Three modes of failure are available: the break may occur within the brick itself, at the brick-mortar interface, or within the mortar itself. The latter provides a practical measurement of the strength of the mortar itself and is the predominant mode of failure with the four-point flexure test described. The three-point flexure test measures the failure strength of the brick-mortar composite. Failure within the brick itself suggests that either the particular brick contained a serious flaw, or that the mortar joint strength is of the same magnitude or greater than that of the refractory brick. The mode of failure should always be reported in the final report.
3.5 A ruggedness test for this test method3 performed in 1985 found the following variables to be rugged: specimen size (2.5 to 3.0 in.), mortared surface (cut versus uncut), joint thickness (1/16 to 1/8 in.), pulling of rods (fast versu...
SCOPE
1.1 This test method covers the determination of the bonding strength of air-setting refractory mortar by determining the flexural strength (modulus of rupture) at room temperature of oven-dried brick-mortar joints.
1.2 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.
1.3 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
Relations
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: C198 − 09 (Reapproved 2019)
Standard Test Method for
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Cold Bonding Strength of Refractory Mortar
This standard is issued under the fixed designation C198; 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.
1. Scope Determine the Precision of a Test Method
1.1 This test method covers the determination of the bond-
3. Significance and Use
ing strength of air-setting refractory mortar by determining the
flexural strength (modulus of rupture) at room temperature of 3.1 The data developed by this test method show the
bonding strength and intrinsic strength of different qualities of
oven-dried brick-mortar joints.
air-setting mortar.The procedures described in this test method
1.2 The values stated in inch-pound units are to be regarded
measure the bonding strength and intrinsic strength of air-
as standard. The values given in parentheses are mathematical
setting mortars when used with specific brands or lots of
conversions to SI units that are provided for information only
refractory brick.
and are not considered standard.
3.2 Note that it is possible to obtain results with these
1.3 This standard does not purport to address all of the
methods for brick and mortar combinations which are incom-
safety concerns, if any, associated with its use. It is the
patible for use at high operating temperatures. The user must
responsibility of the user of this standard to establish appro-
determine this compatibility. Only brick and mortar combina-
priate safety, health, and environmental practices and deter-
tions known or intended to be compatible for a particular use
mine the applicability of regulatory limitations prior to use.
should be tested.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard- 3.3 Properties of the brick, including its strength, apparent
ization established in the Decision on Principles for the porosity, and pore size distribution, can affect the measurement
Development of International Standards, Guides and Recom- of both the bonding strength of the brick-mortar composite and
mendations issued by the World Trade Organization Technical the intrinsic strength of the mortar. The average modulus of
Barriers to Trade (TBT) Committee. rupture of the test brick, as determined by Test Methods C133,
should exceed that expected for the mortar being tested. The
2. Referenced Documents
testing of specific brands or lots of brick and mortar is
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preferred.
2.1 ASTM Standards:
C78/C78M Test Method for Flexural Strength of Concrete
3.4 Three modes of failure are available: the break may
(Using Simple Beam with Third-Point Loading)
occur within the brick itself, at the brick-mortar interface, or
C133 Test Methods for Cold Crushing Strength and Modu-
within the mortar itself. The latter provides a practical mea-
lus of Rupture of Refractories
surement of the strength of the mortar itself and is the
C651 Test Method for Flexural Strength of Manufactured
predominant mode of failure with the four-point flexure test
CarbonandGraphiteArticlesUsingFour-PointLoadingat
described. The three-point flexure test measures the failure
Room Temperature
strengthofthebrick-mortarcomposite.Failurewithinthebrick
E4 Practices for Force Verification of Testing Machines
itself suggests that either the particular brick contained a
E177 Practice for Use of the Terms Precision and Bias in
serious flaw, or that the mortar joint strength is of the same
ASTM Test Methods
magnitude or greater than that of the refractory brick. The
E691 Practice for Conducting an Interlaboratory Study to
mode of failure should always be reported in the final report.
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3.5 A ruggedness test for this test method performed in
1985foundthefollowingvariablestoberugged:specimensize
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This test method is under the jurisdiction of ASTM Committee C08 on
(2.5 to 3.0 in.), mortared surface (cut versus uncut), joint
Refractories and is the direct responsibility of Subcommittee C08.01 on Strength.
1 1
Current edition approved April 1, 2019. Published April 2019. Originally
thickness ( ⁄16 to ⁄8 in.), pulling of rods (fast versus slow), the
approved in 1945. Last previous edition approved in 2013 as C198 – 09 (2013).
DOI: 10.1520/C0198-09R19.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Supporting data have been filed at ASTM International Hea
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