ASTM C1399-01
(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 for specified beam deflections beginning after the beam has been cracked in a standard manner. The test provides data needed to obtain that portion of the load-deflection curve beyond which significant 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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Designation: C 1399 – 01
Test Method for
Obtaining Average Residual-Strength of Fiber-Reinforced
1
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 3.1.1 deflection—mid–span deflection of the test beam ob-
tained in a manner that excludes deflection caused by the
1.1 This test method covers the determination of residual
following: (1) the flexural test apparatus, (2) crushing and
strength of a fiber–reinforced concrete test beam. The average
seating of the beam at support contact points, and (3) torsion of
residual strength is computed for specified beam deflections
the beam; sometimes termed net deflection.
beginning after the beam has been cracked in a standard
3.1.2 initial loading curve—the load–deflection curve ob-
manner. The test provides data needed to obtain that portion of
tained by testing an assembly that includes both the test beam
the load–deflection curve beyond which significant cracking
and a specified steel plate (Fig. 1); plotted to a deflection of at
damage has occurred and it provides a measure of post–crack-
least 0.25 mm (0.010 in.) (Fig. 2).
ing strength, as such strength is affected by the use of
3.1.3 reloading curve—the load–deflection curve obtained
fiber–reinforcement.
by reloading and retesting the precracked beam, that is, after
1.2 This standard does not purport to address all of the
the initial loading but without the steel plate. (Fig. 2)
safety concerns, if any, associated with its use. It is the
3.1.4 reloading deflection—deflection measured during the
responsibility of the user of this standard to establish appro-
reloading of the cracked beam and with zero deflection
priate safety and health practices and determine the applica-
referenced to the start of the reloading.
bility of regulatory limitations prior to use.
3.1.5 residual strength—the flexural stress on the cracked
1.3 The values stated in SI units are to be regarded as the
beam section obtained by calculation using loads obtained
standard. The values in parentheses are for information only.
from the reloading curve at specified deflection values (see
2. Referenced Documents Note 1).
2.1 ASTM Standards:
NOTE 1—Residual strength is not a true stress but an engineering stress
C 31 Practice for Making and Curing Concrete Test Speci-
computed using the flexure formula for linear elastic materials and gross
2
mens in the Field (uncracked) section properties.
C 42 Test Method for Obtaining and Testing Drilled Cores
3.1.6 average residual strength—the average stress–carry-
2
and Sawed Beams of Concrete
ing ability of the cracked beam that is obtained by calculation
C 78 Test Method for Flexural Strength of Concrete (Using
using the residual strength at four specified deflections.
2
Simple Beam with Third–Point Loading)
2
C 172 Practice for Sampling Freshly Mixed Concrete 4. Summary of Test Method
C 192 Practice for Making and Curing Concrete Test Speci-
4.1 Cast or sawed beams of fiber–reinforced concrete are
2
mens in the Laboratory
cracked using the third–point loading apparatus specified in
C 823 Practice for Examining and Sampling of Hardened
Test Method C 78 modified by a steel plate used to assist in
2
Concrete in Constructions
support of the concrete beam during an initial loading cycle
C 1018 Test Method for Flexural Toughness and First Crack
(Fig. 1). The steel plate is used to help control the rate of
Strength of Fiber-Reinforced Concrete (Using Beam With
deflection when the beam cracks. After the beam has been
2
Third Point Loading)
cracked in the specified manner, the steel plate is removed and
the cracked beam is reloaded to obtain data to plot a reloading
3. Terminology
load–deflection curve. Load values at specified deflection
3.1 Definitions of Terms Specific to This Standard:
values on the reloading curve are averaged and used to
calculate the average residual strength of the beam.
1
This specification is under the jurisdiction of ASTM Committee C09 on
5. Significance and Use
Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee
C09.42 on Fiber-Reinforced Concrete.
5.1 This test method provides a quantitative measure useful
Current edition approved Nov. 10, 2001. Published January 2002. Originally
in the evaluation of the performance of fiber–reinforced
published as C 1399–98. Last previous edition C 1399–00.
2 concrete. It allows for comparative analysis among beams
Annual Book of ASTM Standards, Vol 04.02.
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