ASTM D7616/D7616M-11(2023) PDF
Standard Test Method for Determining Apparent Overlap Splice Shear Strength Properties of Wet Lay-Up Fiber-Reinforced Polymer Matrix Composites Used for Strengthening Civil Structures
Standard Test Method for Determining Apparent Overlap Splice Shear Strength Properties of Wet Lay-Up Fiber-Reinforced Polymer Matrix Composites Used for Strengthening Civil Structures
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 7
- Дата публикации:
- 1 апреля 2023 г.
- Издание:
- D7616/D7616M
- ICS:
- 83.180
SIGNIFICANCE AND USE 5.1 Overlap splices are used in field applications of FRP composites when site conditions prohibit continuous access to a structural element or when the specified length of the FRP composite is such that saturation and placement of the entire length would be cumbersome. This method can be used as a quality control mechanism for ensuring that overlap splices constructed under field conditions meet or exceed the requirements established by the design engineer or FRP system manufacturer. Both the saturant mixing and fiber saturation method can be verified for wet-layup FRP systems. 5.2 Caution is recommended when interpreting apparent shear strength results obtained from this method. Single shear lap splices develop non-uniform shear stress distributions within the overlap splice region during testing. Additional guidance on the interpretation and use of results obtained from lap shear testing is found in D4896. 5.3 This test method focuses on the FRP material itself, irrespective of gripping method. Therefore, strengths resulting from failure or pullout at either grip are disregarded. The strength measurements are based solely on test specimens that fail in the gauge section (away from the grips) or at the splice. SCOPE 1.1 This test method describes the requirements for sample preparation and tensile testing of single-lap shear splices formed with fiber-reinforced polymer (FRP) composite materials commonly used for strengthening of structures made of materials such as metals, timber, masonry, and reinforced concrete. The objective of this method is to determine the apparent shear strength of an overlap splice joint through the application of a far-field tensile force. The method applies to wet lay-up FRP material systems fabricated on site or in a laboratory setting. The FRP composite may be of either unidirectional (0°) or cross-ply (0/90 type) reinforcement. For cross-ply laminates, the construction may be achieved using multiple-layers of unidirectional fibers at either 0 or 90°, or one or more layers of stitched or woven 0/90 fabrics. The composite material forms are limited to continuous fiber or discontinuous fiber-reinforced composites in which the laminate is balanced and symmetric with respect to the test direction. The method is often used to determine the length of the overlap splice needed to ensure that a tension failure occurs in the material away from the splice rather than the splice connection itself. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.2.1 Within the text, the inch-pound units are shown in brackets. 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.
Abstract
Overview
ASTM D7616/D7616M-11(2023) is a standard test method developed by ASTM International for determining the apparent overlap splice shear strength properties of wet lay-up fiber-reinforced polymer (FRP) matrix composites. These composites are widely used in the strengthening of civil structures, including metals, timber, masonry, and reinforced concrete. The standard outlines requirements for sample preparation, specimen geometry, tensile testing, and the evaluation of overlap splice performance, providing a framework for quality assurance and field application verification in structural strengthening projects.
Key Topics
- Wet Lay-Up FRP Composites: Focuses on composite materials fabricated by manually impregnating dry fibers with a polymer matrix, used in both laboratory and on-site installations.
- Overlap Splice Joints: Guidance for preparing and testing splice joints where continuous fiber runs are not possible, a common challenge in field applications.
- Shear Strength Testing: Procedures for applying tensile force to single-lap shear splices, measuring apparent shear strength, and distinguishing between various common failure modes.
- Specimen Preparation: Recommendations for specimen size, overlap length, width, and thickness to ensure consistent and repeatable test results.
- Quality Assurance: The method serves as a quality control tool for verifying that field-constructed splices meet design or manufacturer requirements.
- Data Reporting: Instructions for calculating and reporting average values, standard deviation, coefficient of variation, and details on failure modes.
- Units of Measurement: Specifies that results may be reported in either SI or inch-pound units, but not mixed.
Applications
ASTM D7616/D7616M-11(2023) is integral to the assessment and validation of FRP composite systems in civil engineering, particularly where:
- Field Splicing is Required: When continuous application of FRP materials is impractical due to site constraints or lengthy spans, this standard ensures that overlap splices possess adequate mechanical strength.
- Structural Rehabilitation Projects: Used to certify that wet lay-up FRP systems for beams, columns, slabs, bridges, and other infrastructure components meet necessary strength performance goals.
- Quality Control in Construction: Offers a method for on-site or laboratory verification of installed overlap splice joints to meet the standards set by engineers or FRP manufacturers.
- Research and Development: Useful in evaluating different FRP systems, adhesive types, and lay-up methods by providing a consistent means of comparison for splice effectiveness.
Related Standards
Several ASTM standards are referenced for complementary testing and terminology:
- ASTM D883 - Terminology Relating to Plastics
- ASTM D3878 - Terminology for Composite Materials
- ASTM D3039/D3039M - Test Method for Tensile Properties of Polymer Matrix Composite Materials
- ASTM D4896 - Guide for Use of Adhesive-Bonded Single Lap-Joint Specimen Test Results
- ASTM D7565/D7565M - Test Method for Determining Tensile Properties of Fiber Reinforced Polymer Matrix Composites Used for Strengthening of Civil Structures
- ASTM D5229/D5229M - Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials
- ASTM E6, E122, E177, E456 - Standards related to mechanical testing methods and statistical evaluation
Practical Value
By following ASTM D7616/D7616M-11(2023), engineers, quality control professionals, and researchers can:
- Ensure reliable performance of FRP reinforcement systems in civil structures
- Establish standardized protocols for testing splice joints, supporting consistent and trusted results
- Document and compare the effectiveness of different materials, adhesives, and field practices
- Satisfy regulatory and design requirements for safety, durability, and quality in structural restoration and strengthening projects
Employing this standard helps extend the lifespan of critical infrastructure, supports sustainability by enabling effective rehabilitation, and boosts confidence in composite strengthening technologies.
Технические детали
- Технический комитет
- D30 - Composite Materials
- SKU
- ASTM D7616/D7616M-11(2023)
Похожие стандарты
Другие стандарты ASTM
ASTM-TPT-47
Phase I & Phase II Environmental Site Assessment Processes
Phase I & Phase II Environmental Site Assessment Processes
ASTM-TPT-8
Phase I Environmental Site Assessment Practices For Commercial Real Estate: Phase I Site Assessment & Transac…
ASTM-TPT-1137
ASTM D975 Standard Specification for Diesel Fuel
ASTM D975 Standard Specification for Diesel Fuel
ASTM-TPT-1202
ASTM D8421 Standard Test Method for Determination of Per- and Polyfluoroalkyl Substances (PFAS) in Aqueous Ma…
ASTM D8421 Standard Test Method -- eLearning Course
ASTM-TPT-691
Microaprendizagem para D4057: Amostragem de ponto (PT)
D4057 Microlearning: Spot Sampling Portuguese
ASTM-TPT-1091
Metodo de prueba estandar D4052 de ASTM -- Curso de aprendizaje electrónico (ES)
Modulo eLearning para ASTM D4052 en espanol
ASTM ACEM20180086
Using Neutron Radiography to Quantify the Settlement of Fresh Concrete
Specifications have been implemented for concrete bridge decks in North America that restrict the use of higher slump concrete mixtures primarily because of concerns about differential settlement and…
ASTM ACEM20180041
Experimental Study of Competing Failure of Reinforced Concrete Based on the Weibull Distribution
To predict the failure lifetime of reinforced concrete, a current accelerating corrosion test was performed on concrete by simulating the environment in an area with saline soil. To study the concret…