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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

    Active Standard ASTM D8337 / D8337M | Developed by Subcommittee: D30.10

    Book of Standards Volume: 15.03

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    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 Equation D8337_D8337M-21_2 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 Equation D8337_D8337M-21_3 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.

    1. 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 Barriers to Trade (TBT) Committee.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    C31/C31M Practice for Making and Curing Concrete Test Specimens in the Field

    C33/C33M Specification for Concrete Aggregates

    C39/C39M Test Method for Compressive Strength of Cylindrical Concrete Specimens

    C42/C42M Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete

    C125 Terminology Relating to Concrete and Concrete Aggregates

    C150/C150M Specification for Portland Cement

    C192/C192M Practice for Making and Curing Concrete Test Specimens in the Laboratory

    C496/C496M Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens

    C511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of Hydraulic Cements and Concretes

    C617/C617M Practice for Capping Cylindrical Concrete Specimens

    D883 Terminology Relating to Plastics

    D3039/D3039M Test Method for Tensile Properties of Polymer Matrix Composite Materials

    D3878 Terminology for Composite Materials

    D5229/D5229M Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials

    D7565/D7565M Test Method for Determining Tensile Properties of Fiber Reinforced Polymer Matrix Composites Used for Strengthening of Civil Structures

    D7958/D7958M Test Method for Evaluation of Performance for FRP Composite Bonded to Concrete Substrate using Beam Test

    E4 Practices for Force Verification of Testing Machines

    E6 Terminology Relating to Methods of Mechanical Testing

    E122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process

    E251 Test Methods for Performance Characteristics of Metallic Bonded Resistance Strain Gages

    E456 Terminology Relating to Quality and Statistics

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D8337_D8337M-21

    Citation Format

    ASTM D8337 / D8337M-21, Standard Test Method for Evaluation of Bond Properties of FRP Composite Applied to Concrete Substrate using Single-Lap Shear Test, ASTM International, West Conshohocken, PA, 2021, www.astm.org

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