ASTM C1609/C1609M-24 PDF
Standard Test Method for Flexural Performance of Fiber-Reinforced Concrete (Using Beam With Third-Point Loading)
Standard Test Method for Flexural Performance of Fiber-Reinforced Concrete (Using Beam With Third-Point Loading)
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 10
- Дата публикации:
- 1 января 2024 г.
- Издание:
- C1609/C1609M
- ICS:
- 91.100.40
SIGNIFICANCE AND USE 5.1 The first-peak strength characterizes the flexural behavior of the fiber-reinforced concrete up to the onset of cracking, while residual strengths at specified deflections characterize the residual capacity after cracking. Specimen toughness is a measure of the energy absorption capacity of the test specimen. The appropriateness of each parameter depends on the nature of the proposed application and the level of acceptable cracking and deflection serviceability. Fiber-reinforced concrete is influenced in different ways by the amount and type of fibers in the concrete. In some cases, fibers may increase the residual load and toughness capacity at specified deflections while producing a first-peak strength equal to or only slightly greater than the flexural strength of the concrete without fibers. In other cases, fibers may significantly increase the first-peak and peak strengths while affecting a relatively small increase in residual load capacity and specimen toughness at specified deflections. 5.2 The first-peak strength, peak strength, and residual strengths determined by this test method reflect the behavior of fiber-reinforced concrete under static flexural loading. The absolute values of energy absorption obtained in this test are of little direct relevance to the performance of fiber-reinforced concrete structures since they depend directly on the size and shape of the specimen and the loading arrangement. 5.3 The results of this test method may be used for comparing the performance of various fiber-reinforced concrete mixtures or in research and development work. They may also be used to monitor concrete quality, to verify compliance with construction specifications, obtain flexural strength data on fiber-reinforced concrete members subject to pure bending, or to evaluate the quality of concrete in service. 5.4 The results of this standard test method are dependent on the size of the specimen. Note 5: The results obtained using one size molded ... SCOPE 1.1 This test method evaluates the flexural performance of fiber-reinforced concrete using parameters derived from the load-deflection curve obtained by testing a simply supported beam under third-point loading using a closed-loop, servo-controlled testing system. 1.2 This test method provides for the determination of first-peak and peak loads and the corresponding stresses calculated by inserting them in the formula for modulus of rupture given in Eq 1. It also requires determination of residual loads at specified deflections, the corresponding residual strengths calculated by inserting them in the formula for modulus of rupture given in Eq 1 (see Note 1). It provides for determination of specimen toughness based on the area under the load-deflection curve up to a prescribed deflection (see Note 2) and the corresponding equivalent flexural strength ratio. Note 1: Residual strength is not a true stress but an engineering stress computed using simple engineering bending theory for linear elastic materials and gross (uncracked) section properties. Note 2: Specimen toughness expressed in terms of the area under the load-deflection curve is an indication of the energy absorption capability of the particular test specimen, and its magnitude depends directly on the geometry of the test specimen and the loading configuration. 1.3 This test method utilizes two preferred specimen sizes of 100 mm by 100 mm by 350 mm [4 in. by 4 in. by 14 in.] tested on a 300 mm [12 in.] span, or 150 mm by 150 mm by 500 mm [6 in. by 6 in. by 20 in.] tested on a 450 mm [18 in.] span. A specimen size different from the two preferred specimen sizes is permissible. 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 may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may...
Abstract
Overview
ASTM C1609/C1609M-24: Standard Test Method for Flexural Performance of Fiber-Reinforced Concrete (Using Beam With Third-Point Loading) sets forth procedures for assessing the flexural performance of fiber-reinforced concrete (FRC). This method measures key parameters such as first-peak strength, peak strength, residual strengths, load-deflection behavior, and specimen toughness. By utilizing a standardized approach, the method ensures consistent comparison of different fiber-reinforced concrete mixes and provides valuable data for design, construction, quality control, and research purposes.
Key Topics
- Flexural Performance Assessment: The standard outlines protocols for evaluating the flexural behavior of fiber-reinforced concrete beams using third-point loading.
- First-Peak and Peak Strengths: Quantifies the flexural strength at the point of initial cracking (first-peak) and the maximum force resisted by the specimen (peak strength).
- Residual Strengths: Evaluates load-carrying capacities after cracking at specified deflections, providing insight into the post-crack performance of FRC.
- Specimen Toughness: Measures the energy absorption capacity, a critical indicator of the ductility and durability provided by fiber reinforcement.
- Load-Deflection Curve Analysis: Derived parameters are based on load versus deflection data, supporting performance-based assessments of FRC under bending.
- Specimen Size Dependency: Specifies preferred specimen dimensions and notes that results are influenced by the size and shape of both the specimen and loading arrangement.
- Applicability to Various Fibers: The standard acknowledges that both the amount and type of fiber affect performance, and outlines how their influence is captured by the test parameters.
Applications
ASTM C1609/C1609M-24 is widely used across the concrete industry to:
- Material Comparison: Compare flexural performance of different fiber-reinforced concrete mixtures for R&D or quality assurance.
- Design Verification: Obtain essential performance data for structural elements in applications where crack resistance and energy absorption are important, such as slabs, pavements, industrial floors, and precast elements.
- Quality Control: Monitor and verify compliance with project specifications and check material uniformity during construction.
- Evaluation of In-situ Concrete: Assess structural integrity and flexural performance of existing fiber-reinforced concrete via cores or beams extracted from service structures.
- Research and Development: Support the development of new FRC products and optimize fiber content/type for targeted performance.
- Regulatory and Code Compliance: Provide required data for code acceptance and regulatory submissions involving fiber-reinforced concrete technology.
Related Standards
For comprehensive evaluation and compliance, the following ASTM standards are commonly referenced alongside ASTM C1609/C1609M:
- ASTM C78/C78M: Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading)
- ASTM C42/C42M: Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete
- ASTM C31/C31M and C192/C192M: Practices for Making and Curing Concrete Test Specimens in the Field and Laboratory
- ASTM C172/C172M: Practice for Sampling Freshly Mixed Concrete
- ASTM C823/C823M: Practice for Examination and Sampling of Hardened Concrete in Constructions
- ASTM E4: Practices for Force Calibration and Verification of Testing Machines
- ASTM C1812/C1812M: Practice for Design of Journal Bearing Supports (specific to FRC testing)
Practical Value
Adoption of ASTM C1609/C1609M-24 enables engineers, specifiers, and quality control professionals to accurately assess and compare the flexural performance of fiber-reinforced concrete. Its standardized procedure provides reliable, reproducible data critical for design optimization, quality assurance, safety analysis, and performance documentation. Employing this standard leads to the selection of FRC mixtures that enhance durability, crack resistance, and structural resilience in a broad range of civil engineering and infrastructure projects.
Keywords: fiber-reinforced concrete, flexural performance, ASTM C1609, third-point loading, residual strength, specimen toughness, load-deflection, quality control, concrete testing, construction standards.
Технические детали
- Технический комитет
- C09 - Concrete and Concrete Aggregates
- SKU
- ASTM C1609/C1609M-24
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