Standard Test Method for Evaluation of Bond Properties of FRP Composite Applied to Concrete Substrate using Single-Lap Shear Test

SIGNIFICANCE AND USE
5.1 This test method is intended for use in a laboratory setting.  
5.2 This test method is used to evaluate the plateau force Ppl that an FRP composite can bear before complete debonding from a concrete prism.  
5.3 The evaluation of the plateau force is intended to be made under consistent environmental conditioning and the tests conducted in ambient laboratory or otherwise consistent environmental conditions.  
5.4 This test can be used to determine the effective bond length leff of the FRP composite if different bonded lengths are tested with constant bonded width. The effective bond length leff is defined as the minimum bonded length  necessary to achieve the bond capacity Ppl for the width of FRP tested.  
5.5 This test can be used to determine the variation of the bond capacity with the bonded width bf if different bonded widths are tested while the bonded length  is constant and greater than the effective bond length leff.  
5.6 This test is used to obtain the plot of the applied force versus loaded end (or global) slip of the composite with respect to the substrate. The loaded end slip is the average of two linear variable differential transformer (LVDT) readings, as described in 7.6. The plot obtained is used to determine the bond properties of the system.  
5.7 This test method can also serve as a means for uniformly preparing and testing standard specimens suitable for being subject to environmental conditioning and subsequently used to evaluate FRP-bonded-to-concrete system performance, and evaluating and reporting the results. The comparison of results from this test method conducted on identical specimens subject to different environmental conditioning protocols can be used to evaluate the effects of environmental exposure on the bond performance of FRP systems.
SCOPE
1.1 This test method describes the apparatus and procedure to evaluate the lap shear bond properties of wet lay-up or shop-fabricated (for example, pultruded) fiber-reinforced polymer (FRP) composite systems adhesively applied to a flat concrete substrate. The test determines the plateau force that an FRP system can bear before complete debonding from a concrete prism tested using a direct single-lap shear test. This plateau force is reported as bond capacity and may be different from the maximum applied force. The plateau force is then used to determine the interfacial fracture energy and the cohesive material law.  
1.2 This test method is not intended for job approval or for product qualification purposes unless an external agency adopts the test method for those purposes.  
1.3 This test method is intended for use with adhesive-applied or wet lay-up FRP systems and is appropriate for use with FRP systems having any fiber orientation or combination of ply orientations comprising the FRP composite, although the test condition only considers forces in the direction parallel to the prism longitudinal axis.  
1.4 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
1.4.1 Within the text, the inch-pound units are shown in brackets.  
1.5 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.  
1.6 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 Barrier...

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ASTM D8337/D8337M-21 - Standard Test Method for Evaluation of Bond Properties of FRP Composite Applied to Concrete Substrate using Single-Lap Shear Test
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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: D8337/D8337M − 21
Standard Test Method for
Evaluation of Bond Properties of FRP Composite Applied to
1
Concrete Substrate using Single-Lap Shear Test
This standard is issued under the fixed designation D8337/D8337M; 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 ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.1 This test method describes the apparatus and procedure
mendations issued by the World Trade Organization Technical
to evaluate the lap shear bond properties of wet lay-up or
Barriers to Trade (TBT) Committee.
shop-fabricated (for example, pultruded) fiber-reinforced poly-
mer (FRP) composite systems adhesively applied to a flat
2. Referenced Documents
concretesubstrate.Thetestdeterminestheplateauforcethatan
2
FRP system can bear before complete debonding from a 2.1 ASTM Standards:
concrete prism tested using a direct single-lap shear test. This C31/C31MPractice for Making and Curing Concrete Test
plateau force is reported as bond capacity and may be different Specimens in the Field
from the maximum applied force. The plateau force is then C33/C33MSpecification for Concrete Aggregates
used to determine the interfacial fracture energy and the C39/C39MTest Method for Compressive Strength of Cylin-
cohesive material law. drical Concrete Specimens
C42/C42MTest Method for Obtaining and Testing Drilled
1.2 This test method is not intended for job approval or for
Cores and Sawed Beams of Concrete
product qualification purposes unless an external agency
C125Terminology Relating to Concrete and Concrete Ag-
adopts the test method for those purposes.
gregates
1.3 This test method is intended for use with adhesive-
C150/C150MSpecification for Portland Cement
applied or wet lay-up FRP systems and is appropriate for use
C192/C192MPracticeforMakingandCuringConcreteTest
with FRPsystems having any fiber orientation or combination
Specimens in the Laboratory
ofplyorientationscomprisingtheFRPcomposite,althoughthe
C496/C496MTest Method for Splitting Tensile Strength of
test condition only considers forces in the direction parallel to
Cylindrical Concrete Specimens
the prism longitudinal axis.
C511Specification for Mixing Rooms, Moist Cabinets,
Moist Rooms, and Water Storage Tanks Used in the
1.4 Units—The values stated in either SI units or inch-
pound units are to be regarded separately as standard. The Testing of Hydraulic Cements and Concretes
C617/C617MPractice for Capping Cylindrical Concrete
values stated in each system are not necessarily exact equiva-
lents; therefore, to ensure conformance with the standard, each Specimens
D883Terminology Relating to Plastics
system shall be used independently of the other, and values
from the two systems shall not be combined. D3039/D3039MTest Method forTensile Properties of Poly-
mer Matrix Composite Materials
1.4.1 Within the text, the inch-pound units are shown in
brackets. D3878Terminology for Composite Materials
D5229/D5229MTestMethodforMoistureAbsorptionProp-
1.5 This standard does not purport to address all of the
erties and Equilibrium Conditioning of Polymer Matrix
safety concerns, if any, associated with its use. It is the
Composite Materials
responsibility of the user of this standard to establish appro-
D7565/D7565MTest Method for DeterminingTensile Prop-
priate safety, health, and environmental practices and deter-
erties of Fiber Reinforced Polymer Matrix Composites
mine the applicability of regulatory limitations prior to use.
Used for Strengthening of Civil Structures
1.6 This international standard was developed in accor-
D7958/D7958MTestMethodforEvaluationofPerformance
dance with internationally recognized principles on standard-
1
This test method is under the jurisdiction of ASTM Committee D30 on
2
Composite Materials and is the direct responsibility of Subcommittee D30.10 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Composites for Civil Structures. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved Jan. 1, 2021. Published May 2021. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
D8337_D8337M-21. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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