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ASTM D 7522/D7522M : 2021

Current
Current

The latest, up-to-date edition.

Standard Test Method for Pull-Off Strength for FRP Laminate Systems Bonded to Concrete or Masonry Substrates
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

27-01-2021

1.1This test method describes the apparatus and procedure for evaluating the pull-off strength of wet lay-up or pultruded (shop-fabricated) Fiber Reinforced Polymer (FRP) laminate systems adhesively bonded to a flat concrete substrate. The test determines the greatest perpendicular force (in tension) that an FRP system can bear before a plug of material is detached. Failure will occur along the weakest plane within the system comprised of the test fixture, FRP laminate, adhesive, and substrate.

1.2This test method is primarily used for quality control and assessment of field repairs of structures using adhesive-applied composite materials.

1.3This test method is appropriate for use with FRP systems having any fiber orientation or combination of ply orientations comprising the FRP laminate.

1.4This test method is appropriate for use with flat concrete, concrete masonry, clay masonry, and stone masonry substrates.

1.5This test method is not appropriate for use as an “acceptance” or “proof” wherein the FRP system remaining intact at a prescribed force is an acceptable result.

1.6Pull-off strength measurements depend upon both material and instrumental parameters. Different adhesion test devices and procedures will give different results and cannot be directly compared.

1.7This test method can be destructive. Spot repairs may be necessary. The test method will result in an exposed cut FRP section; repair methods must consider the potential for moisture uptake through this cut section.

1.8Prior to the installation of some adhesively bonded FRP systems, the substrate must be patched. This test method is not appropriate for determining the pull-off strength of the FRP from the patch material. An additional test method is required to determine the pull-off strength of the patch from the substrate.

1.9Units—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.

1.10This 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.

1.11This 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.

Committee
D 30
DocumentType
Test Method
Pages
6
PublisherName
American Society for Testing and Materials
Status
Current
Supersedes

ACI SPEC-440.12:2022 Strengthening of Concrete Structures with Externally Bonded Fiber-Reinforced Polymer (FRP) Materials Using the Wet Layup Method—Specification
ASTM D 4762 : 2018 Standard Guide for Testing Polymer Matrix Composite Materials

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ASTM E 6 : 2002 Standard Terminology Relating to Methods of Mechanical Testing
ASTM C 125 : 2000 Standard Terminology Relating to Concrete and Concrete Aggregates
ASTM E 122 : 2017 : R2022 Standard Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process
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ASTM C 1232 : 2023 Standard Terminology for Masonry
ASTM E 6 : 2015 : EDT 3 Standard Terminology Relating to Methods of Mechanical Testing
ASTM D 3878 : 2020 : REV B Standard Terminology for Composite Materials
ASTM E 6 : 2023 : REV A Standard Terminology Relating to Methods of Mechanical Testing
ASTM C 125 : 2021 : REV A Standard Terminology Relating to Concrete and Concrete Aggregates
ASTM C 1232 : 2021 Standard Terminology for Masonry
ASTM E 6 : 2015 : EDT 4 : REDLINE Standard Terminology Relating to Methods of Mechanical Testing
ASTM C 125 : 2020 Standard Terminology Relating to Concrete and Concrete Aggregates
ASTM E 6 : 2015 : EDT 4 Standard Terminology Relating to Methods of Mechanical Testing
ASTM E 6 : 2023 Standard Terminology Relating to Methods of Mechanical Testing
ASTM D 3878 : 2001 Standard Terminology Composite Materials
ASTM C 1232 : 2021 : REV A Standard Terminology for Masonry
ASTM C 125 : 2009 Standard Terminology Relating to Concrete and Concrete Aggregates

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