ASTM C947-03

Standard Test Method for Flexural Properties of Thin-Section Glass-Fiber-Reinforced Concrete (Using Simple Beam With Third-Point Loading)

SIGNIFICANCE AND USE
Flexural properties determined by this test method are useful for quality control of glass-fiber reinforced concrete products, ascertaining compliance with the governing specifications, research and development, and generating data for use in product design.
SCOPE
1.1 This test method covers determination of the flexural ultimate strength in bending and the yield strength of glass-fiber reinforced concrete sections by the use of a simple beam of 1.0 in. (25.4 mm) or less in depth using third-point loading.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-Jun-2003
• Technical Committee: C27 - Precast Concrete Products
• Drafting Committee: C27.40 - Glass Fiber Reinforced Concrete

Relations

• Replaces: ASTM C947-99 - Standard Test Method for Flexural Properties of Thin-Section Glass-Fiber-Reinforced Concrete (Using Simple Beam With Third-Point Loading)
• Effective Date: 10-Jun-2003
• Replaced By: ASTM C947-03(2009) - Standard Test Method for Flexural Properties of Thin-Section Glass-Fiber-Reinforced Concrete (Using Simple Beam With Third-Point Loading)
• Effective Date: 01-May-2009
• Referred By: ASTM C1560-03(2023) - Standard Test Method for Hot Water Accelerated Aging of Glass-Fiber Reinforced Cement-Based Composites
• Effective Date: 10-Jun-2003
• Referred By: ASTM C1355/C1355M-96(2020) - Standard Specification for Glass Fiber Reinforced Gypsum Composites
• Effective Date: 10-Jun-2003
• Referred By: ASTM C1228-96(2023) - Standard Practice for Preparing Coupons for Flexural and Washout Tests on Glass Fiber Reinforced Concrete
• Effective Date: 10-Jun-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C 947 – 03
Standard Test Method for
Flexural Properties of Thin-Section Glass-Fiber-Reinforced
1
Concrete (Using Simple Beam With Third-Point Loading)
This standard is issued under the fixed designation C 947; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope exceed 6 1.0 % of the maximum force expected to be
measured shall be used. The testing machine shall be equipped
1.1 This test method covers determination of the flexural
with a deflection measuring and recording device.The stiffness
ultimate strength in bending and the yield strength of glass-
of the testing machine shall be such that the total elastic
fiber reinforced concrete sections by the use of a simple beam
deformation of the system does not exceed 1.0 % of the total
of 1.0 in. (25.4 mm) or less in depth using third-point loading.
deflection of the test specimen during the test, or appropriate
1.2 The values stated in inch-pound units are to be regarded
corrections shall be made. The force-indicating mechanism
as the standard. The values given in parentheses are for
shall be essentially free of inertial lag at the crosshead rate
information only.
used. The accuracy of the testing machine shall be verified in
1.3 This standard does not purport to address all of the
accordance with Practices E 4 and Specification D 76.
safety concerns, if any, associated with its use. It is the
4.2 Loading Noses and Supports—The loading noses and
responsibility of the user of this standard to establish appro-
supports shall have cylindrical surfaces. In order to avoid
priate safety and health practices and determine the applica-
excessive indentation or failure due to stress concentration
bility of regulatory limitations prior to use.
directly under the loading noses or supports, the radius of the
2. Referenced Documents
nosesandsupportsshallbeatleast0.25in.(6.35mm).SeeFig.
1 for loading configuration. The arc of the loading noses and
2.1 ASTM Standards:
supports, in contact with the specimen, shall be sufficiently
C 1228 Practice for Flexural and Washout Tests on Glass
2
large to prevent contact of the specimen with the sides of the
Fiber Reinforced Concrete
1
noses. Neoprene pads, approximately ⁄16 in. (1.6 mm) thick,
D 76 Specification for Tensile Testing Machines for Tex-
3
maybeplacedbetweentheloadingnosesandthetestspecimen
tiles
4
for uniform load distribution across the width of the specimen.
E 4 Practices for Force Verification of Testing Machines
However, neoprene pads should not be used if deflection
3. Significance and Use
measurements are to be made, as the compression of the
neoprene will distort the measurements.
3.1 Flexural properties determined by this test method are
4.3 Loading Head and Support Apparatus—Loading noses,
useful for quality control of glass-fiber reinforced concrete
supports,andtheirrespectiveholdingdevicesshallbedesigned
products, ascertaining compliance with the governing specifi-
to allow rotation to occur about axes that lie in horizontal
cations, research and development, and generating data for use
planes of the loading apparatus as shown in Fig. 1. This
in product design.
configuration of loading head and support apparatus will
4. Apparatus
ensure that forces applied to the specimen will be initially
perpendicular to the surfaces of the specimen and applied
4.1 Testing Machine—A properly calibrated testing ma-
without eccentricity.
chinethatcanbeoperatedatconstantratesofcrossheadmotion
4.4 Specimen Depth and Width Measuring Device—A cali-
and in which the error in the force measuring system shall not
per or micrometer or other suitable device that is able to
measure sample depth accurate to 0.005 in. (0.13 mm) and
1
This test method is under the jurisdiction ofASTM Committee C27 on Precast
width accurate to 0.01 in. (0.25 mm).
Concrete Products and is the direct responsibility of Subcommittee C27.40 on Glass
Fiber Reinforced Concrete Made by the Spray-Up Process.
5. Sampling
Current edition approved June 10, 2003. Published July 2003. Originally
approved in 1981. Last previous edition approved in 1999 as C 947 - 99.
5.1 Test boards shall be manufactured in accordance with
2
Annual Book of ASTM Standards, Vol 04.05.
governing specifications.
3
Annual Book of ASTM Standards, Vol 07.01.
4
Annual Book of ASTM Standards, Vol 03.01.
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C 947 – 03
8.5 Test three specimens with the mold face in tension and
three specimens with the opposite face (o
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