ASTM C1399-04
(Test Method)Test Method for Obtaining Average Residual-Strength of Fiber-Reinforced Concrete
Test Method for Obtaining Average Residual-Strength of Fiber-Reinforced Concrete
SCOPE
1.1 This test method covers the determination of residual strength of a fiber-reinforced concrete test beam. The average residual strength is computed using specified beam deflections that are obtained from a beam that has been cracked in a standard manner. The test provides data needed to obtain that portion of the load-deflection curve beyond which a significant amount of cracking damage has occurred and it provides a measure of post-cracking strength, as such strength is affected by the use of fiber-reinforcement.
1.2 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.
1.3 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
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Standards Content (Sample)
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Designation: C 1399 – 04
Standard Test Method for
Obtaining Average Residual-Strength of Fiber-Reinforced
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Concrete
This standard is issued under the fixed designation C 1399; 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* Third-Point Loading)
1.1 This test method covers the determination of residual
3. Terminology
strength of a fiber–reinforced concrete test beam. The average
3.1 Definitions of Terms Specific to This Standard:
residual strength is computed using specified beam deflections
3.1.1 deflection—mid–span deflection of the test beam ob-
that are obtained from a beam that has been cracked in a
tained in a manner that excludes deflection caused by the
standard manner. The test provides data needed to obtain that
following: (1) the flexural test apparatus, (2) crushing and
portionoftheload–deflectioncurvebeyondwhichasignificant
seating of the beam at support contact points, and (3) torsion of
amount of cracking damage has occurred and it provides a
the beam; sometimes termed net deflection.
measure of post–cracking strength, as such strength is affected
3.1.2 initial loading curve—the load–deflection curve ob-
by the use of fiber–reinforcement.
tained by testing an assembly that includes both the test beam
1.2 This standard does not purport to address all of the
and a specified steel plate (Fig. 1); plotted to a deflection of at
safety concerns, if any, associated with its use. It is the
least 0.25 mm (0.010 in.) (Fig. 3).
responsibility of the user of this standard to establish appro-
3.1.3 reloading curve—the load–deflection curve obtained
priate safety and health practices and determine the applica-
by reloading and retesting the pre-cracked beam, that is, after
bility of regulatory limitations prior to use.
the initial loading but without the steel plate. (Fig. 3)
1.3 The values stated in SI units are to be regarded as the
3.1.4 reloading deflection—deflection measured during the
standard. The values in parentheses are for information only.
reloading of the cracked beam and with zero deflection
2. Referenced Documents referenced to the start of the reloading.
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3.1.5 residual strength—the flexural stress on the cracked
2.1 ASTM Standards:
beam section obtained by calculation using loads obtained
C 31/C 31M Practice for Making and Curing Concrete Test
from the reloading curve at specified deflection values (see
Specimens in the Field
Note 1).
C 42/C 42M Test Method for Obtaining and Testing Drilled
Cores and Sawed Beams of Concrete
NOTE 1—Residual strength is not a true stress but an engineering stress
C 78 Test Method for Flexural Strength of Concrete (Using computed using the flexure formula for linear elastic materials and gross
(uncracked) section properties.
Simple Beam with Third-Point Loading)
C 172 Practice for Sampling Freshly Mixed Concrete
3.1.6 average residual strength—the average stress–carry-
C 192/C 192M Practice for Making and Curing Concrete
ing ability of the cracked beam that is obtained by calculation
Test Specimens in the Laboratory
using the residual strength at four specified deflections.
C 823 Practice for Examination and Sampling of Hardened
4. Summary of Test Method
Concrete in Constructions
C 1018 TestMethodforFlexuralToughnessandFirstCrack
4.1 Cast or sawed beams of fiber–reinforced concrete are
Strength of Fiber-Reinforced Concrete (Using Beam With
cracked using the third–point loading apparatus specified in
Test Method C 78 modified by a steel plate used to assist in
support of the concrete beam during an initial loading cycle
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This test method is under the jurisdiction of ASTM Committee C09 on
(Fig. 1). The steel plate is used to help control the rate of
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
deflection when the beam cracks. After the beam has been
C09.42 on Fiber-Reinforced Concrete.
Current edition approved July 1, 2004. Published August 2004. Originally
cracked in the specified manner, the steel plate is removed and
approved in 1998. Last previous edition approved in 2002 as C 1399–02.
the cracked beam is reloaded to obtain data to plot a reloading
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
load–deflection curve. Load values at specified deflection
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*A Summary of Changes section appears at the end of this standard.
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